| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ | 
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| 2 | /* memcontrol.h - Memory Controller | 
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| 3 | * | 
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| 4 | * Copyright IBM Corporation, 2007 | 
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| 5 | * Author Balbir Singh <balbir@linux.vnet.ibm.com> | 
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| 6 | * | 
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| 7 | * Copyright 2007 OpenVZ SWsoft Inc | 
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| 8 | * Author: Pavel Emelianov <xemul@openvz.org> | 
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| 9 | */ | 
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| 10 |  | 
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| 11 | #ifndef _LINUX_MEMCONTROL_H | 
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| 12 | #define _LINUX_MEMCONTROL_H | 
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| 13 | #include <linux/cgroup.h> | 
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| 14 | #include <linux/vm_event_item.h> | 
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| 15 | #include <linux/hardirq.h> | 
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| 16 | #include <linux/jump_label.h> | 
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| 17 | #include <linux/kernel.h> | 
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| 18 | #include <linux/page_counter.h> | 
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| 19 | #include <linux/vmpressure.h> | 
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| 20 | #include <linux/eventfd.h> | 
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| 21 | #include <linux/mm.h> | 
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| 22 | #include <linux/vmstat.h> | 
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| 23 | #include <linux/writeback.h> | 
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| 24 | #include <linux/page-flags.h> | 
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| 25 | #include <linux/shrinker.h> | 
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| 26 |  | 
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| 27 | struct mem_cgroup; | 
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| 28 | struct obj_cgroup; | 
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| 29 | struct page; | 
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| 30 | struct mm_struct; | 
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| 31 | struct kmem_cache; | 
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| 32 |  | 
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| 33 | /* Cgroup-specific page state, on top of universal node page state */ | 
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| 34 | enum memcg_stat_item { | 
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| 35 | MEMCG_SWAP = NR_VM_NODE_STAT_ITEMS, | 
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| 36 | MEMCG_SOCK, | 
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| 37 | MEMCG_PERCPU_B, | 
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| 38 | MEMCG_VMALLOC, | 
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| 39 | MEMCG_KMEM, | 
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| 40 | MEMCG_ZSWAP_B, | 
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| 41 | MEMCG_ZSWAPPED, | 
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| 42 | MEMCG_NR_STAT, | 
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| 43 | }; | 
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| 44 |  | 
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| 45 | enum memcg_memory_event { | 
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| 46 | MEMCG_LOW, | 
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| 47 | MEMCG_HIGH, | 
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| 48 | MEMCG_MAX, | 
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| 49 | MEMCG_OOM, | 
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| 50 | MEMCG_OOM_KILL, | 
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| 51 | MEMCG_OOM_GROUP_KILL, | 
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| 52 | MEMCG_SWAP_HIGH, | 
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| 53 | MEMCG_SWAP_MAX, | 
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| 54 | MEMCG_SWAP_FAIL, | 
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| 55 | MEMCG_NR_MEMORY_EVENTS, | 
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| 56 | }; | 
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| 57 |  | 
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| 58 | struct mem_cgroup_reclaim_cookie { | 
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| 59 | pg_data_t *pgdat; | 
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| 60 | int generation; | 
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| 61 | }; | 
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| 62 |  | 
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| 63 | #ifdef CONFIG_MEMCG | 
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| 64 |  | 
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| 65 | #define MEM_CGROUP_ID_SHIFT	16 | 
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| 66 |  | 
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| 67 | struct mem_cgroup_id { | 
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| 68 | int id; | 
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| 69 | refcount_t ref; | 
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| 70 | }; | 
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| 71 |  | 
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| 72 | struct memcg_vmstats_percpu; | 
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| 73 | struct memcg1_events_percpu; | 
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| 74 | struct memcg_vmstats; | 
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| 75 | struct lruvec_stats_percpu; | 
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| 76 | struct lruvec_stats; | 
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| 77 |  | 
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| 78 | struct mem_cgroup_reclaim_iter { | 
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| 79 | struct mem_cgroup *position; | 
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| 80 | /* scan generation, increased every round-trip */ | 
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| 81 | atomic_t generation; | 
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| 82 | }; | 
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| 83 |  | 
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| 84 | /* | 
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| 85 | * per-node information in memory controller. | 
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| 86 | */ | 
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| 87 | struct mem_cgroup_per_node { | 
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| 88 | /* Keep the read-only fields at the start */ | 
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| 89 | struct mem_cgroup	*memcg;		/* Back pointer, we cannot */ | 
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| 90 | /* use container_of	   */ | 
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| 91 |  | 
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| 92 | struct lruvec_stats_percpu __percpu	*lruvec_stats_percpu; | 
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| 93 | struct lruvec_stats			*lruvec_stats; | 
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| 94 | struct shrinker_info __rcu	*shrinker_info; | 
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| 95 |  | 
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| 96 | #ifdef CONFIG_MEMCG_V1 | 
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| 97 | /* | 
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| 98 | * Memcg-v1 only stuff in middle as buffer between read mostly fields | 
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| 99 | * and update often fields to avoid false sharing. If v1 stuff is | 
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| 100 | * not present, an explicit padding is needed. | 
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| 101 | */ | 
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| 102 |  | 
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| 103 | struct rb_node		tree_node;	/* RB tree node */ | 
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| 104 | unsigned long		usage_in_excess;/* Set to the value by which */ | 
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| 105 | /* the soft limit is exceeded*/ | 
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| 106 | bool			on_tree; | 
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| 107 | #else | 
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| 108 | CACHELINE_PADDING(_pad1_); | 
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| 109 | #endif | 
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| 110 |  | 
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| 111 | /* Fields which get updated often at the end. */ | 
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| 112 | struct lruvec		lruvec; | 
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| 113 | CACHELINE_PADDING(_pad2_); | 
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| 114 | unsigned long		lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS]; | 
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| 115 | struct mem_cgroup_reclaim_iter	iter; | 
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| 116 |  | 
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| 117 | #ifdef CONFIG_MEMCG_NMI_SAFETY_REQUIRES_ATOMIC | 
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| 118 | /* slab stats for nmi context */ | 
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| 119 | atomic_t		slab_reclaimable; | 
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| 120 | atomic_t		slab_unreclaimable; | 
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| 121 | #endif | 
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| 122 | }; | 
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| 123 |  | 
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| 124 | struct mem_cgroup_threshold { | 
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| 125 | struct eventfd_ctx *eventfd; | 
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| 126 | unsigned long threshold; | 
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| 127 | }; | 
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| 128 |  | 
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| 129 | /* For threshold */ | 
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| 130 | struct mem_cgroup_threshold_ary { | 
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| 131 | /* An array index points to threshold just below or equal to usage. */ | 
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| 132 | int current_threshold; | 
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| 133 | /* Size of entries[] */ | 
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| 134 | unsigned int size; | 
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| 135 | /* Array of thresholds */ | 
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| 136 | struct mem_cgroup_threshold entries[] __counted_by(size); | 
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| 137 | }; | 
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| 138 |  | 
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| 139 | struct mem_cgroup_thresholds { | 
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| 140 | /* Primary thresholds array */ | 
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| 141 | struct mem_cgroup_threshold_ary *primary; | 
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| 142 | /* | 
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| 143 | * Spare threshold array. | 
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| 144 | * This is needed to make mem_cgroup_unregister_event() "never fail". | 
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| 145 | * It must be able to store at least primary->size - 1 entries. | 
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| 146 | */ | 
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| 147 | struct mem_cgroup_threshold_ary *spare; | 
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| 148 | }; | 
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| 149 |  | 
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| 150 | /* | 
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| 151 | * Remember four most recent foreign writebacks with dirty pages in this | 
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| 152 | * cgroup.  Inode sharing is expected to be uncommon and, even if we miss | 
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| 153 | * one in a given round, we're likely to catch it later if it keeps | 
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| 154 | * foreign-dirtying, so a fairly low count should be enough. | 
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| 155 | * | 
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| 156 | * See mem_cgroup_track_foreign_dirty_slowpath() for details. | 
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| 157 | */ | 
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| 158 | #define MEMCG_CGWB_FRN_CNT	4 | 
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| 159 |  | 
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| 160 | struct memcg_cgwb_frn { | 
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| 161 | u64 bdi_id;			/* bdi->id of the foreign inode */ | 
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| 162 | int memcg_id;			/* memcg->css.id of foreign inode */ | 
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| 163 | u64 at;				/* jiffies_64 at the time of dirtying */ | 
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| 164 | struct wb_completion done;	/* tracks in-flight foreign writebacks */ | 
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| 165 | }; | 
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| 166 |  | 
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| 167 | /* | 
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| 168 | * Bucket for arbitrarily byte-sized objects charged to a memory | 
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| 169 | * cgroup. The bucket can be reparented in one piece when the cgroup | 
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| 170 | * is destroyed, without having to round up the individual references | 
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| 171 | * of all live memory objects in the wild. | 
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| 172 | */ | 
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| 173 | struct obj_cgroup { | 
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| 174 | struct percpu_ref refcnt; | 
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| 175 | struct mem_cgroup *memcg; | 
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| 176 | atomic_t nr_charged_bytes; | 
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| 177 | union { | 
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| 178 | struct list_head list; /* protected by objcg_lock */ | 
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| 179 | struct rcu_head rcu; | 
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| 180 | }; | 
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| 181 | }; | 
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| 182 |  | 
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| 183 | /* | 
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| 184 | * The memory controller data structure. The memory controller controls both | 
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| 185 | * page cache and RSS per cgroup. We would eventually like to provide | 
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| 186 | * statistics based on the statistics developed by Rik Van Riel for clock-pro, | 
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| 187 | * to help the administrator determine what knobs to tune. | 
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| 188 | */ | 
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| 189 | struct mem_cgroup { | 
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| 190 | struct cgroup_subsys_state css; | 
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| 191 |  | 
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| 192 | /* Private memcg ID. Used to ID objects that outlive the cgroup */ | 
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| 193 | struct mem_cgroup_id id; | 
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| 194 |  | 
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| 195 | /* Accounted resources */ | 
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| 196 | struct page_counter memory;		/* Both v1 & v2 */ | 
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| 197 |  | 
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| 198 | union { | 
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| 199 | struct page_counter swap;	/* v2 only */ | 
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| 200 | struct page_counter memsw;	/* v1 only */ | 
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| 201 | }; | 
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| 202 |  | 
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| 203 | /* registered local peak watchers */ | 
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| 204 | struct list_head memory_peaks; | 
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| 205 | struct list_head swap_peaks; | 
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| 206 | spinlock_t	 peaks_lock; | 
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| 207 |  | 
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| 208 | /* Range enforcement for interrupt charges */ | 
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| 209 | struct work_struct high_work; | 
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| 210 |  | 
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| 211 | #ifdef CONFIG_ZSWAP | 
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| 212 | unsigned long zswap_max; | 
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| 213 |  | 
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| 214 | /* | 
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| 215 | * Prevent pages from this memcg from being written back from zswap to | 
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| 216 | * swap, and from being swapped out on zswap store failures. | 
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| 217 | */ | 
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| 218 | bool zswap_writeback; | 
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| 219 | #endif | 
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| 220 |  | 
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| 221 | /* vmpressure notifications */ | 
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| 222 | struct vmpressure vmpressure; | 
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| 223 |  | 
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| 224 | /* | 
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| 225 | * Should the OOM killer kill all belonging tasks, had it kill one? | 
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| 226 | */ | 
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| 227 | bool oom_group; | 
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| 228 |  | 
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| 229 | int swappiness; | 
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| 230 |  | 
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| 231 | /* memory.events and memory.events.local */ | 
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| 232 | struct cgroup_file events_file; | 
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| 233 | struct cgroup_file events_local_file; | 
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| 234 |  | 
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| 235 | /* handle for "memory.swap.events" */ | 
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| 236 | struct cgroup_file swap_events_file; | 
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| 237 |  | 
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| 238 | /* memory.stat */ | 
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| 239 | struct memcg_vmstats	*vmstats; | 
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| 240 |  | 
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| 241 | /* memory.events */ | 
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| 242 | atomic_long_t		memory_events[MEMCG_NR_MEMORY_EVENTS]; | 
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| 243 | atomic_long_t		memory_events_local[MEMCG_NR_MEMORY_EVENTS]; | 
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| 244 |  | 
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| 245 | #ifdef CONFIG_MEMCG_NMI_SAFETY_REQUIRES_ATOMIC | 
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| 246 | /* MEMCG_KMEM for nmi context */ | 
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| 247 | atomic_t		kmem_stat; | 
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| 248 | #endif | 
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| 249 | /* | 
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| 250 | * Hint of reclaim pressure for socket memroy management. Note | 
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| 251 | * that this indicator should NOT be used in legacy cgroup mode | 
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| 252 | * where socket memory is accounted/charged separately. | 
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| 253 | */ | 
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| 254 | u64			socket_pressure; | 
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| 255 | #if BITS_PER_LONG < 64 | 
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| 256 | seqlock_t		socket_pressure_seqlock; | 
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| 257 | #endif | 
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| 258 | int kmemcg_id; | 
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| 259 | /* | 
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| 260 | * memcg->objcg is wiped out as a part of the objcg repaprenting | 
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| 261 | * process. memcg->orig_objcg preserves a pointer (and a reference) | 
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| 262 | * to the original objcg until the end of live of memcg. | 
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| 263 | */ | 
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| 264 | struct obj_cgroup __rcu	*objcg; | 
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| 265 | struct obj_cgroup	*orig_objcg; | 
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| 266 | /* list of inherited objcgs, protected by objcg_lock */ | 
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| 267 | struct list_head objcg_list; | 
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| 268 |  | 
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| 269 | struct memcg_vmstats_percpu __percpu *vmstats_percpu; | 
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| 270 |  | 
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| 271 | #ifdef CONFIG_CGROUP_WRITEBACK | 
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| 272 | struct list_head cgwb_list; | 
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| 273 | struct wb_domain cgwb_domain; | 
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| 274 | struct memcg_cgwb_frn cgwb_frn[MEMCG_CGWB_FRN_CNT]; | 
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| 275 | #endif | 
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| 276 |  | 
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| 277 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | 
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| 278 | struct deferred_split deferred_split_queue; | 
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| 279 | #endif | 
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| 280 |  | 
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| 281 | #ifdef CONFIG_LRU_GEN_WALKS_MMU | 
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| 282 | /* per-memcg mm_struct list */ | 
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| 283 | struct lru_gen_mm_list mm_list; | 
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| 284 | #endif | 
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| 285 |  | 
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| 286 | #ifdef CONFIG_MEMCG_V1 | 
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| 287 | /* Legacy consumer-oriented counters */ | 
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| 288 | struct page_counter kmem;		/* v1 only */ | 
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| 289 | struct page_counter tcpmem;		/* v1 only */ | 
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| 290 |  | 
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| 291 | struct memcg1_events_percpu __percpu *events_percpu; | 
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| 292 |  | 
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| 293 | unsigned long soft_limit; | 
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| 294 |  | 
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| 295 | /* protected by memcg_oom_lock */ | 
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| 296 | bool oom_lock; | 
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| 297 | int under_oom; | 
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| 298 |  | 
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| 299 | /* OOM-Killer disable */ | 
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| 300 | int oom_kill_disable; | 
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| 301 |  | 
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| 302 | /* protect arrays of thresholds */ | 
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| 303 | struct mutex thresholds_lock; | 
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| 304 |  | 
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| 305 | /* thresholds for memory usage. RCU-protected */ | 
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| 306 | struct mem_cgroup_thresholds thresholds; | 
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| 307 |  | 
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| 308 | /* thresholds for mem+swap usage. RCU-protected */ | 
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| 309 | struct mem_cgroup_thresholds memsw_thresholds; | 
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| 310 |  | 
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| 311 | /* For oom notifier event fd */ | 
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| 312 | struct list_head oom_notify; | 
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| 313 |  | 
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| 314 | /* Legacy tcp memory accounting */ | 
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| 315 | bool tcpmem_active; | 
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| 316 | int tcpmem_pressure; | 
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| 317 |  | 
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| 318 | /* List of events which userspace want to receive */ | 
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| 319 | struct list_head event_list; | 
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| 320 | spinlock_t event_list_lock; | 
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| 321 | #endif /* CONFIG_MEMCG_V1 */ | 
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| 322 |  | 
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| 323 | struct mem_cgroup_per_node *nodeinfo[]; | 
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| 324 | }; | 
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| 325 |  | 
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| 326 | /* | 
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| 327 | * size of first charge trial. | 
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| 328 | * TODO: maybe necessary to use big numbers in big irons or dynamic based of the | 
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| 329 | * workload. | 
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| 330 | */ | 
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| 331 | #define MEMCG_CHARGE_BATCH 64U | 
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| 332 |  | 
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| 333 | extern struct mem_cgroup *root_mem_cgroup; | 
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| 334 |  | 
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| 335 | enum page_memcg_data_flags { | 
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| 336 | /* page->memcg_data is a pointer to an slabobj_ext vector */ | 
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| 337 | MEMCG_DATA_OBJEXTS = (1UL << 0), | 
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| 338 | /* page has been accounted as a non-slab kernel page */ | 
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| 339 | MEMCG_DATA_KMEM = (1UL << 1), | 
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| 340 | /* the next bit after the last actual flag */ | 
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| 341 | __NR_MEMCG_DATA_FLAGS  = (1UL << 2), | 
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| 342 | }; | 
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| 343 |  | 
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| 344 | #define __OBJEXTS_ALLOC_FAIL	MEMCG_DATA_OBJEXTS | 
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| 345 | #define __FIRST_OBJEXT_FLAG	__NR_MEMCG_DATA_FLAGS | 
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| 346 |  | 
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| 347 | #else /* CONFIG_MEMCG */ | 
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| 348 |  | 
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| 349 | #define __OBJEXTS_ALLOC_FAIL	(1UL << 0) | 
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| 350 | #define __FIRST_OBJEXT_FLAG	(1UL << 0) | 
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| 351 |  | 
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| 352 | #endif /* CONFIG_MEMCG */ | 
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| 353 |  | 
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| 354 | enum objext_flags { | 
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| 355 | /* | 
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| 356 | * Use bit 0 with zero other bits to signal that slabobj_ext vector | 
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| 357 | * failed to allocate. The same bit 0 with valid upper bits means | 
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| 358 | * MEMCG_DATA_OBJEXTS. | 
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| 359 | */ | 
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| 360 | OBJEXTS_ALLOC_FAIL = __OBJEXTS_ALLOC_FAIL, | 
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| 361 | /* slabobj_ext vector allocated with kmalloc_nolock() */ | 
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| 362 | OBJEXTS_NOSPIN_ALLOC = __FIRST_OBJEXT_FLAG, | 
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| 363 | /* the next bit after the last actual flag */ | 
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| 364 | __NR_OBJEXTS_FLAGS  = (__FIRST_OBJEXT_FLAG << 1), | 
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| 365 | }; | 
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| 366 |  | 
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| 367 | #define OBJEXTS_FLAGS_MASK (__NR_OBJEXTS_FLAGS - 1) | 
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| 368 |  | 
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| 369 | #ifdef CONFIG_MEMCG | 
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| 370 |  | 
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| 371 | static inline bool folio_memcg_kmem(struct folio *folio); | 
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| 372 |  | 
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| 373 | /* | 
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| 374 | * After the initialization objcg->memcg is always pointing at | 
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| 375 | * a valid memcg, but can be atomically swapped to the parent memcg. | 
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| 376 | * | 
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| 377 | * The caller must ensure that the returned memcg won't be released. | 
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| 378 | */ | 
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| 379 | static inline struct mem_cgroup *obj_cgroup_memcg(struct obj_cgroup *objcg) | 
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| 380 | { | 
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| 381 | lockdep_assert_once(rcu_read_lock_held() || lockdep_is_held(&cgroup_mutex)); | 
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| 382 | return READ_ONCE(objcg->memcg); | 
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| 383 | } | 
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| 384 |  | 
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| 385 | /* | 
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| 386 | * __folio_memcg - Get the memory cgroup associated with a non-kmem folio | 
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| 387 | * @folio: Pointer to the folio. | 
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| 388 | * | 
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| 389 | * Returns a pointer to the memory cgroup associated with the folio, | 
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| 390 | * or NULL. This function assumes that the folio is known to have a | 
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| 391 | * proper memory cgroup pointer. It's not safe to call this function | 
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| 392 | * against some type of folios, e.g. slab folios or ex-slab folios or | 
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| 393 | * kmem folios. | 
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| 394 | */ | 
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| 395 | static inline struct mem_cgroup *__folio_memcg(struct folio *folio) | 
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| 396 | { | 
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| 397 | unsigned long memcg_data = folio->memcg_data; | 
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| 398 |  | 
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| 399 | VM_BUG_ON_FOLIO(folio_test_slab(folio), folio); | 
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| 400 | VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_OBJEXTS, folio); | 
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| 401 | VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_KMEM, folio); | 
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| 402 |  | 
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| 403 | return (struct mem_cgroup *)(memcg_data & ~OBJEXTS_FLAGS_MASK); | 
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| 404 | } | 
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| 405 |  | 
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| 406 | /* | 
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| 407 | * __folio_objcg - get the object cgroup associated with a kmem folio. | 
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| 408 | * @folio: Pointer to the folio. | 
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| 409 | * | 
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| 410 | * Returns a pointer to the object cgroup associated with the folio, | 
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| 411 | * or NULL. This function assumes that the folio is known to have a | 
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| 412 | * proper object cgroup pointer. It's not safe to call this function | 
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| 413 | * against some type of folios, e.g. slab folios or ex-slab folios or | 
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| 414 | * LRU folios. | 
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| 415 | */ | 
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| 416 | static inline struct obj_cgroup *__folio_objcg(struct folio *folio) | 
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| 417 | { | 
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| 418 | unsigned long memcg_data = folio->memcg_data; | 
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| 419 |  | 
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| 420 | VM_BUG_ON_FOLIO(folio_test_slab(folio), folio); | 
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| 421 | VM_BUG_ON_FOLIO(memcg_data & MEMCG_DATA_OBJEXTS, folio); | 
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| 422 | VM_BUG_ON_FOLIO(!(memcg_data & MEMCG_DATA_KMEM), folio); | 
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| 423 |  | 
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| 424 | return (struct obj_cgroup *)(memcg_data & ~OBJEXTS_FLAGS_MASK); | 
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| 425 | } | 
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| 426 |  | 
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| 427 | /* | 
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| 428 | * folio_memcg - Get the memory cgroup associated with a folio. | 
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| 429 | * @folio: Pointer to the folio. | 
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| 430 | * | 
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| 431 | * Returns a pointer to the memory cgroup associated with the folio, | 
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| 432 | * or NULL. This function assumes that the folio is known to have a | 
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| 433 | * proper memory cgroup pointer. It's not safe to call this function | 
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| 434 | * against some type of folios, e.g. slab folios or ex-slab folios. | 
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| 435 | * | 
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| 436 | * For a non-kmem folio any of the following ensures folio and memcg binding | 
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| 437 | * stability: | 
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| 438 | * | 
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| 439 | * - the folio lock | 
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| 440 | * - LRU isolation | 
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| 441 | * - exclusive reference | 
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| 442 | * | 
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| 443 | * For a kmem folio a caller should hold an rcu read lock to protect memcg | 
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| 444 | * associated with a kmem folio from being released. | 
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| 445 | */ | 
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| 446 | static inline struct mem_cgroup *folio_memcg(struct folio *folio) | 
|---|
| 447 | { | 
|---|
| 448 | if (folio_memcg_kmem(folio)) | 
|---|
| 449 | return obj_cgroup_memcg(__folio_objcg(folio)); | 
|---|
| 450 | return __folio_memcg(folio); | 
|---|
| 451 | } | 
|---|
| 452 |  | 
|---|
| 453 | /* | 
|---|
| 454 | * folio_memcg_charged - If a folio is charged to a memory cgroup. | 
|---|
| 455 | * @folio: Pointer to the folio. | 
|---|
| 456 | * | 
|---|
| 457 | * Returns true if folio is charged to a memory cgroup, otherwise returns false. | 
|---|
| 458 | */ | 
|---|
| 459 | static inline bool folio_memcg_charged(struct folio *folio) | 
|---|
| 460 | { | 
|---|
| 461 | return folio->memcg_data != 0; | 
|---|
| 462 | } | 
|---|
| 463 |  | 
|---|
| 464 | /* | 
|---|
| 465 | * folio_memcg_check - Get the memory cgroup associated with a folio. | 
|---|
| 466 | * @folio: Pointer to the folio. | 
|---|
| 467 | * | 
|---|
| 468 | * Returns a pointer to the memory cgroup associated with the folio, | 
|---|
| 469 | * or NULL. This function unlike folio_memcg() can take any folio | 
|---|
| 470 | * as an argument. It has to be used in cases when it's not known if a folio | 
|---|
| 471 | * has an associated memory cgroup pointer or an object cgroups vector or | 
|---|
| 472 | * an object cgroup. | 
|---|
| 473 | * | 
|---|
| 474 | * For a non-kmem folio any of the following ensures folio and memcg binding | 
|---|
| 475 | * stability: | 
|---|
| 476 | * | 
|---|
| 477 | * - the folio lock | 
|---|
| 478 | * - LRU isolation | 
|---|
| 479 | * - exclusive reference | 
|---|
| 480 | * | 
|---|
| 481 | * For a kmem folio a caller should hold an rcu read lock to protect memcg | 
|---|
| 482 | * associated with a kmem folio from being released. | 
|---|
| 483 | */ | 
|---|
| 484 | static inline struct mem_cgroup *folio_memcg_check(struct folio *folio) | 
|---|
| 485 | { | 
|---|
| 486 | /* | 
|---|
| 487 | * Because folio->memcg_data might be changed asynchronously | 
|---|
| 488 | * for slabs, READ_ONCE() should be used here. | 
|---|
| 489 | */ | 
|---|
| 490 | unsigned long memcg_data = READ_ONCE(folio->memcg_data); | 
|---|
| 491 |  | 
|---|
| 492 | if (memcg_data & MEMCG_DATA_OBJEXTS) | 
|---|
| 493 | return NULL; | 
|---|
| 494 |  | 
|---|
| 495 | if (memcg_data & MEMCG_DATA_KMEM) { | 
|---|
| 496 | struct obj_cgroup *objcg; | 
|---|
| 497 |  | 
|---|
| 498 | objcg = (void *)(memcg_data & ~OBJEXTS_FLAGS_MASK); | 
|---|
| 499 | return obj_cgroup_memcg(objcg); | 
|---|
| 500 | } | 
|---|
| 501 |  | 
|---|
| 502 | return (struct mem_cgroup *)(memcg_data & ~OBJEXTS_FLAGS_MASK); | 
|---|
| 503 | } | 
|---|
| 504 |  | 
|---|
| 505 | static inline struct mem_cgroup *page_memcg_check(struct page *page) | 
|---|
| 506 | { | 
|---|
| 507 | if (PageTail(page)) | 
|---|
| 508 | return NULL; | 
|---|
| 509 | return folio_memcg_check((struct folio *)page); | 
|---|
| 510 | } | 
|---|
| 511 |  | 
|---|
| 512 | static inline struct mem_cgroup *get_mem_cgroup_from_objcg(struct obj_cgroup *objcg) | 
|---|
| 513 | { | 
|---|
| 514 | struct mem_cgroup *memcg; | 
|---|
| 515 |  | 
|---|
| 516 | rcu_read_lock(); | 
|---|
| 517 | retry: | 
|---|
| 518 | memcg = obj_cgroup_memcg(objcg); | 
|---|
| 519 | if (unlikely(!css_tryget(&memcg->css))) | 
|---|
| 520 | goto retry; | 
|---|
| 521 | rcu_read_unlock(); | 
|---|
| 522 |  | 
|---|
| 523 | return memcg; | 
|---|
| 524 | } | 
|---|
| 525 |  | 
|---|
| 526 | /* | 
|---|
| 527 | * folio_memcg_kmem - Check if the folio has the memcg_kmem flag set. | 
|---|
| 528 | * @folio: Pointer to the folio. | 
|---|
| 529 | * | 
|---|
| 530 | * Checks if the folio has MemcgKmem flag set. The caller must ensure | 
|---|
| 531 | * that the folio has an associated memory cgroup. It's not safe to call | 
|---|
| 532 | * this function against some types of folios, e.g. slab folios. | 
|---|
| 533 | */ | 
|---|
| 534 | static inline bool folio_memcg_kmem(struct folio *folio) | 
|---|
| 535 | { | 
|---|
| 536 | VM_BUG_ON_PGFLAGS(PageTail(&folio->page), &folio->page); | 
|---|
| 537 | VM_BUG_ON_FOLIO(folio->memcg_data & MEMCG_DATA_OBJEXTS, folio); | 
|---|
| 538 | return folio->memcg_data & MEMCG_DATA_KMEM; | 
|---|
| 539 | } | 
|---|
| 540 |  | 
|---|
| 541 | static inline bool PageMemcgKmem(struct page *page) | 
|---|
| 542 | { | 
|---|
| 543 | return folio_memcg_kmem(page_folio(page)); | 
|---|
| 544 | } | 
|---|
| 545 |  | 
|---|
| 546 | static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg) | 
|---|
| 547 | { | 
|---|
| 548 | return (memcg == root_mem_cgroup); | 
|---|
| 549 | } | 
|---|
| 550 |  | 
|---|
| 551 | static inline bool mem_cgroup_disabled(void) | 
|---|
| 552 | { | 
|---|
| 553 | return !cgroup_subsys_enabled(memory_cgrp_subsys); | 
|---|
| 554 | } | 
|---|
| 555 |  | 
|---|
| 556 | static inline void mem_cgroup_protection(struct mem_cgroup *root, | 
|---|
| 557 | struct mem_cgroup *memcg, | 
|---|
| 558 | unsigned long *min, | 
|---|
| 559 | unsigned long *low) | 
|---|
| 560 | { | 
|---|
| 561 | *min = *low = 0; | 
|---|
| 562 |  | 
|---|
| 563 | if (mem_cgroup_disabled()) | 
|---|
| 564 | return; | 
|---|
| 565 |  | 
|---|
| 566 | /* | 
|---|
| 567 | * There is no reclaim protection applied to a targeted reclaim. | 
|---|
| 568 | * We are special casing this specific case here because | 
|---|
| 569 | * mem_cgroup_calculate_protection is not robust enough to keep | 
|---|
| 570 | * the protection invariant for calculated effective values for | 
|---|
| 571 | * parallel reclaimers with different reclaim target. This is | 
|---|
| 572 | * especially a problem for tail memcgs (as they have pages on LRU) | 
|---|
| 573 | * which would want to have effective values 0 for targeted reclaim | 
|---|
| 574 | * but a different value for external reclaim. | 
|---|
| 575 | * | 
|---|
| 576 | * Example | 
|---|
| 577 | * Let's have global and A's reclaim in parallel: | 
|---|
| 578 | *  | | 
|---|
| 579 | *  A (low=2G, usage = 3G, max = 3G, children_low_usage = 1.5G) | 
|---|
| 580 | *  |\ | 
|---|
| 581 | *  | C (low = 1G, usage = 2.5G) | 
|---|
| 582 | *  B (low = 1G, usage = 0.5G) | 
|---|
| 583 | * | 
|---|
| 584 | * For the global reclaim | 
|---|
| 585 | * A.elow = A.low | 
|---|
| 586 | * B.elow = min(B.usage, B.low) because children_low_usage <= A.elow | 
|---|
| 587 | * C.elow = min(C.usage, C.low) | 
|---|
| 588 | * | 
|---|
| 589 | * With the effective values resetting we have A reclaim | 
|---|
| 590 | * A.elow = 0 | 
|---|
| 591 | * B.elow = B.low | 
|---|
| 592 | * C.elow = C.low | 
|---|
| 593 | * | 
|---|
| 594 | * If the global reclaim races with A's reclaim then | 
|---|
| 595 | * B.elow = C.elow = 0 because children_low_usage > A.elow) | 
|---|
| 596 | * is possible and reclaiming B would be violating the protection. | 
|---|
| 597 | * | 
|---|
| 598 | */ | 
|---|
| 599 | if (root == memcg) | 
|---|
| 600 | return; | 
|---|
| 601 |  | 
|---|
| 602 | *min = READ_ONCE(memcg->memory.emin); | 
|---|
| 603 | *low = READ_ONCE(memcg->memory.elow); | 
|---|
| 604 | } | 
|---|
| 605 |  | 
|---|
| 606 | void mem_cgroup_calculate_protection(struct mem_cgroup *root, | 
|---|
| 607 | struct mem_cgroup *memcg); | 
|---|
| 608 |  | 
|---|
| 609 | static inline bool mem_cgroup_unprotected(struct mem_cgroup *target, | 
|---|
| 610 | struct mem_cgroup *memcg) | 
|---|
| 611 | { | 
|---|
| 612 | /* | 
|---|
| 613 | * The root memcg doesn't account charges, and doesn't support | 
|---|
| 614 | * protection. The target memcg's protection is ignored, see | 
|---|
| 615 | * mem_cgroup_calculate_protection() and mem_cgroup_protection() | 
|---|
| 616 | */ | 
|---|
| 617 | return mem_cgroup_disabled() || mem_cgroup_is_root(memcg) || | 
|---|
| 618 | memcg == target; | 
|---|
| 619 | } | 
|---|
| 620 |  | 
|---|
| 621 | static inline bool mem_cgroup_below_low(struct mem_cgroup *target, | 
|---|
| 622 | struct mem_cgroup *memcg) | 
|---|
| 623 | { | 
|---|
| 624 | if (mem_cgroup_unprotected(target, memcg)) | 
|---|
| 625 | return false; | 
|---|
| 626 |  | 
|---|
| 627 | return READ_ONCE(memcg->memory.elow) >= | 
|---|
| 628 | page_counter_read(&memcg->memory); | 
|---|
| 629 | } | 
|---|
| 630 |  | 
|---|
| 631 | static inline bool mem_cgroup_below_min(struct mem_cgroup *target, | 
|---|
| 632 | struct mem_cgroup *memcg) | 
|---|
| 633 | { | 
|---|
| 634 | if (mem_cgroup_unprotected(target, memcg)) | 
|---|
| 635 | return false; | 
|---|
| 636 |  | 
|---|
| 637 | return READ_ONCE(memcg->memory.emin) >= | 
|---|
| 638 | page_counter_read(&memcg->memory); | 
|---|
| 639 | } | 
|---|
| 640 |  | 
|---|
| 641 | int __mem_cgroup_charge(struct folio *folio, struct mm_struct *mm, gfp_t gfp); | 
|---|
| 642 |  | 
|---|
| 643 | /** | 
|---|
| 644 | * mem_cgroup_charge - Charge a newly allocated folio to a cgroup. | 
|---|
| 645 | * @folio: Folio to charge. | 
|---|
| 646 | * @mm: mm context of the allocating task. | 
|---|
| 647 | * @gfp: Reclaim mode. | 
|---|
| 648 | * | 
|---|
| 649 | * Try to charge @folio to the memcg that @mm belongs to, reclaiming | 
|---|
| 650 | * pages according to @gfp if necessary.  If @mm is NULL, try to | 
|---|
| 651 | * charge to the active memcg. | 
|---|
| 652 | * | 
|---|
| 653 | * Do not use this for folios allocated for swapin. | 
|---|
| 654 | * | 
|---|
| 655 | * Return: 0 on success. Otherwise, an error code is returned. | 
|---|
| 656 | */ | 
|---|
| 657 | static inline int mem_cgroup_charge(struct folio *folio, struct mm_struct *mm, | 
|---|
| 658 | gfp_t gfp) | 
|---|
| 659 | { | 
|---|
| 660 | if (mem_cgroup_disabled()) | 
|---|
| 661 | return 0; | 
|---|
| 662 | return __mem_cgroup_charge(folio, mm, gfp); | 
|---|
| 663 | } | 
|---|
| 664 |  | 
|---|
| 665 | int mem_cgroup_charge_hugetlb(struct folio* folio, gfp_t gfp); | 
|---|
| 666 |  | 
|---|
| 667 | int mem_cgroup_swapin_charge_folio(struct folio *folio, struct mm_struct *mm, | 
|---|
| 668 | gfp_t gfp, swp_entry_t entry); | 
|---|
| 669 |  | 
|---|
| 670 | void __mem_cgroup_uncharge(struct folio *folio); | 
|---|
| 671 |  | 
|---|
| 672 | /** | 
|---|
| 673 | * mem_cgroup_uncharge - Uncharge a folio. | 
|---|
| 674 | * @folio: Folio to uncharge. | 
|---|
| 675 | * | 
|---|
| 676 | * Uncharge a folio previously charged with mem_cgroup_charge(). | 
|---|
| 677 | */ | 
|---|
| 678 | static inline void mem_cgroup_uncharge(struct folio *folio) | 
|---|
| 679 | { | 
|---|
| 680 | if (mem_cgroup_disabled()) | 
|---|
| 681 | return; | 
|---|
| 682 | __mem_cgroup_uncharge(folio); | 
|---|
| 683 | } | 
|---|
| 684 |  | 
|---|
| 685 | void __mem_cgroup_uncharge_folios(struct folio_batch *folios); | 
|---|
| 686 | static inline void mem_cgroup_uncharge_folios(struct folio_batch *folios) | 
|---|
| 687 | { | 
|---|
| 688 | if (mem_cgroup_disabled()) | 
|---|
| 689 | return; | 
|---|
| 690 | __mem_cgroup_uncharge_folios(folios); | 
|---|
| 691 | } | 
|---|
| 692 |  | 
|---|
| 693 | void mem_cgroup_replace_folio(struct folio *old, struct folio *new); | 
|---|
| 694 | void mem_cgroup_migrate(struct folio *old, struct folio *new); | 
|---|
| 695 |  | 
|---|
| 696 | /** | 
|---|
| 697 | * mem_cgroup_lruvec - get the lru list vector for a memcg & node | 
|---|
| 698 | * @memcg: memcg of the wanted lruvec | 
|---|
| 699 | * @pgdat: pglist_data | 
|---|
| 700 | * | 
|---|
| 701 | * Returns the lru list vector holding pages for a given @memcg & | 
|---|
| 702 | * @pgdat combination. This can be the node lruvec, if the memory | 
|---|
| 703 | * controller is disabled. | 
|---|
| 704 | */ | 
|---|
| 705 | static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg, | 
|---|
| 706 | struct pglist_data *pgdat) | 
|---|
| 707 | { | 
|---|
| 708 | struct mem_cgroup_per_node *mz; | 
|---|
| 709 | struct lruvec *lruvec; | 
|---|
| 710 |  | 
|---|
| 711 | if (mem_cgroup_disabled()) { | 
|---|
| 712 | lruvec = &pgdat->__lruvec; | 
|---|
| 713 | goto out; | 
|---|
| 714 | } | 
|---|
| 715 |  | 
|---|
| 716 | if (!memcg) | 
|---|
| 717 | memcg = root_mem_cgroup; | 
|---|
| 718 |  | 
|---|
| 719 | mz = memcg->nodeinfo[pgdat->node_id]; | 
|---|
| 720 | lruvec = &mz->lruvec; | 
|---|
| 721 | out: | 
|---|
| 722 | /* | 
|---|
| 723 | * Since a node can be onlined after the mem_cgroup was created, | 
|---|
| 724 | * we have to be prepared to initialize lruvec->pgdat here; | 
|---|
| 725 | * and if offlined then reonlined, we need to reinitialize it. | 
|---|
| 726 | */ | 
|---|
| 727 | if (unlikely(lruvec->pgdat != pgdat)) | 
|---|
| 728 | lruvec->pgdat = pgdat; | 
|---|
| 729 | return lruvec; | 
|---|
| 730 | } | 
|---|
| 731 |  | 
|---|
| 732 | /** | 
|---|
| 733 | * folio_lruvec - return lruvec for isolating/putting an LRU folio | 
|---|
| 734 | * @folio: Pointer to the folio. | 
|---|
| 735 | * | 
|---|
| 736 | * This function relies on folio->mem_cgroup being stable. | 
|---|
| 737 | */ | 
|---|
| 738 | static inline struct lruvec *folio_lruvec(struct folio *folio) | 
|---|
| 739 | { | 
|---|
| 740 | struct mem_cgroup *memcg = folio_memcg(folio); | 
|---|
| 741 |  | 
|---|
| 742 | VM_WARN_ON_ONCE_FOLIO(!memcg && !mem_cgroup_disabled(), folio); | 
|---|
| 743 | return mem_cgroup_lruvec(memcg, folio_pgdat(folio)); | 
|---|
| 744 | } | 
|---|
| 745 |  | 
|---|
| 746 | struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p); | 
|---|
| 747 |  | 
|---|
| 748 | struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm); | 
|---|
| 749 |  | 
|---|
| 750 | struct mem_cgroup *get_mem_cgroup_from_current(void); | 
|---|
| 751 |  | 
|---|
| 752 | struct mem_cgroup *get_mem_cgroup_from_folio(struct folio *folio); | 
|---|
| 753 |  | 
|---|
| 754 | struct lruvec *folio_lruvec_lock(struct folio *folio); | 
|---|
| 755 | struct lruvec *folio_lruvec_lock_irq(struct folio *folio); | 
|---|
| 756 | struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio, | 
|---|
| 757 | unsigned long *flags); | 
|---|
| 758 |  | 
|---|
| 759 | #ifdef CONFIG_DEBUG_VM | 
|---|
| 760 | void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio); | 
|---|
| 761 | #else | 
|---|
| 762 | static inline | 
|---|
| 763 | void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio) | 
|---|
| 764 | { | 
|---|
| 765 | } | 
|---|
| 766 | #endif | 
|---|
| 767 |  | 
|---|
| 768 | static inline | 
|---|
| 769 | struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){ | 
|---|
| 770 | return css ? container_of(css, struct mem_cgroup, css) : NULL; | 
|---|
| 771 | } | 
|---|
| 772 |  | 
|---|
| 773 | static inline bool obj_cgroup_tryget(struct obj_cgroup *objcg) | 
|---|
| 774 | { | 
|---|
| 775 | return percpu_ref_tryget(&objcg->refcnt); | 
|---|
| 776 | } | 
|---|
| 777 |  | 
|---|
| 778 | static inline void obj_cgroup_get(struct obj_cgroup *objcg) | 
|---|
| 779 | { | 
|---|
| 780 | percpu_ref_get(&objcg->refcnt); | 
|---|
| 781 | } | 
|---|
| 782 |  | 
|---|
| 783 | static inline void obj_cgroup_get_many(struct obj_cgroup *objcg, | 
|---|
| 784 | unsigned long nr) | 
|---|
| 785 | { | 
|---|
| 786 | percpu_ref_get_many(&objcg->refcnt, nr); | 
|---|
| 787 | } | 
|---|
| 788 |  | 
|---|
| 789 | static inline void obj_cgroup_put(struct obj_cgroup *objcg) | 
|---|
| 790 | { | 
|---|
| 791 | if (objcg) | 
|---|
| 792 | percpu_ref_put(&objcg->refcnt); | 
|---|
| 793 | } | 
|---|
| 794 |  | 
|---|
| 795 | static inline bool mem_cgroup_tryget(struct mem_cgroup *memcg) | 
|---|
| 796 | { | 
|---|
| 797 | return !memcg || css_tryget(&memcg->css); | 
|---|
| 798 | } | 
|---|
| 799 |  | 
|---|
| 800 | static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg) | 
|---|
| 801 | { | 
|---|
| 802 | return !memcg || css_tryget_online(&memcg->css); | 
|---|
| 803 | } | 
|---|
| 804 |  | 
|---|
| 805 | static inline void mem_cgroup_put(struct mem_cgroup *memcg) | 
|---|
| 806 | { | 
|---|
| 807 | if (memcg) | 
|---|
| 808 | css_put(&memcg->css); | 
|---|
| 809 | } | 
|---|
| 810 |  | 
|---|
| 811 | #define mem_cgroup_from_counter(counter, member)	\ | 
|---|
| 812 | container_of(counter, struct mem_cgroup, member) | 
|---|
| 813 |  | 
|---|
| 814 | struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *, | 
|---|
| 815 | struct mem_cgroup *, | 
|---|
| 816 | struct mem_cgroup_reclaim_cookie *); | 
|---|
| 817 | void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *); | 
|---|
| 818 | void mem_cgroup_scan_tasks(struct mem_cgroup *memcg, | 
|---|
| 819 | int (*)(struct task_struct *, void *), void *arg); | 
|---|
| 820 |  | 
|---|
| 821 | static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) | 
|---|
| 822 | { | 
|---|
| 823 | if (mem_cgroup_disabled()) | 
|---|
| 824 | return 0; | 
|---|
| 825 |  | 
|---|
| 826 | return memcg->id.id; | 
|---|
| 827 | } | 
|---|
| 828 | struct mem_cgroup *mem_cgroup_from_id(unsigned short id); | 
|---|
| 829 |  | 
|---|
| 830 | #ifdef CONFIG_SHRINKER_DEBUG | 
|---|
| 831 | static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg) | 
|---|
| 832 | { | 
|---|
| 833 | return memcg ? cgroup_ino(memcg->css.cgroup) : 0; | 
|---|
| 834 | } | 
|---|
| 835 |  | 
|---|
| 836 | struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino); | 
|---|
| 837 | #endif | 
|---|
| 838 |  | 
|---|
| 839 | static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m) | 
|---|
| 840 | { | 
|---|
| 841 | return mem_cgroup_from_css(seq_css(m)); | 
|---|
| 842 | } | 
|---|
| 843 |  | 
|---|
| 844 | static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec) | 
|---|
| 845 | { | 
|---|
| 846 | struct mem_cgroup_per_node *mz; | 
|---|
| 847 |  | 
|---|
| 848 | if (mem_cgroup_disabled()) | 
|---|
| 849 | return NULL; | 
|---|
| 850 |  | 
|---|
| 851 | mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec); | 
|---|
| 852 | return mz->memcg; | 
|---|
| 853 | } | 
|---|
| 854 |  | 
|---|
| 855 | /** | 
|---|
| 856 | * parent_mem_cgroup - find the accounting parent of a memcg | 
|---|
| 857 | * @memcg: memcg whose parent to find | 
|---|
| 858 | * | 
|---|
| 859 | * Returns the parent memcg, or NULL if this is the root. | 
|---|
| 860 | */ | 
|---|
| 861 | static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg) | 
|---|
| 862 | { | 
|---|
| 863 | return mem_cgroup_from_css(memcg->css.parent); | 
|---|
| 864 | } | 
|---|
| 865 |  | 
|---|
| 866 | static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg, | 
|---|
| 867 | struct mem_cgroup *root) | 
|---|
| 868 | { | 
|---|
| 869 | if (root == memcg) | 
|---|
| 870 | return true; | 
|---|
| 871 | return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup); | 
|---|
| 872 | } | 
|---|
| 873 |  | 
|---|
| 874 | static inline bool mm_match_cgroup(struct mm_struct *mm, | 
|---|
| 875 | struct mem_cgroup *memcg) | 
|---|
| 876 | { | 
|---|
| 877 | struct mem_cgroup *task_memcg; | 
|---|
| 878 | bool match = false; | 
|---|
| 879 |  | 
|---|
| 880 | rcu_read_lock(); | 
|---|
| 881 | task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); | 
|---|
| 882 | if (task_memcg) | 
|---|
| 883 | match = mem_cgroup_is_descendant(task_memcg, memcg); | 
|---|
| 884 | rcu_read_unlock(); | 
|---|
| 885 | return match; | 
|---|
| 886 | } | 
|---|
| 887 |  | 
|---|
| 888 | struct cgroup_subsys_state *mem_cgroup_css_from_folio(struct folio *folio); | 
|---|
| 889 | ino_t page_cgroup_ino(struct page *page); | 
|---|
| 890 |  | 
|---|
| 891 | static inline bool mem_cgroup_online(struct mem_cgroup *memcg) | 
|---|
| 892 | { | 
|---|
| 893 | if (mem_cgroup_disabled()) | 
|---|
| 894 | return true; | 
|---|
| 895 | return !!(memcg->css.flags & CSS_ONLINE); | 
|---|
| 896 | } | 
|---|
| 897 |  | 
|---|
| 898 | void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru, | 
|---|
| 899 | int zid, int nr_pages); | 
|---|
| 900 |  | 
|---|
| 901 | static inline | 
|---|
| 902 | unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec, | 
|---|
| 903 | enum lru_list lru, int zone_idx) | 
|---|
| 904 | { | 
|---|
| 905 | struct mem_cgroup_per_node *mz; | 
|---|
| 906 |  | 
|---|
| 907 | mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec); | 
|---|
| 908 | return READ_ONCE(mz->lru_zone_size[zone_idx][lru]); | 
|---|
| 909 | } | 
|---|
| 910 |  | 
|---|
| 911 | void __mem_cgroup_handle_over_high(gfp_t gfp_mask); | 
|---|
| 912 |  | 
|---|
| 913 | static inline void mem_cgroup_handle_over_high(gfp_t gfp_mask) | 
|---|
| 914 | { | 
|---|
| 915 | if (unlikely(current->memcg_nr_pages_over_high)) | 
|---|
| 916 | __mem_cgroup_handle_over_high(gfp_mask); | 
|---|
| 917 | } | 
|---|
| 918 |  | 
|---|
| 919 | unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg); | 
|---|
| 920 |  | 
|---|
| 921 | unsigned long mem_cgroup_size(struct mem_cgroup *memcg); | 
|---|
| 922 |  | 
|---|
| 923 | void mem_cgroup_print_oom_context(struct mem_cgroup *memcg, | 
|---|
| 924 | struct task_struct *p); | 
|---|
| 925 |  | 
|---|
| 926 | void mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg); | 
|---|
| 927 |  | 
|---|
| 928 | struct mem_cgroup *mem_cgroup_get_oom_group(struct task_struct *victim, | 
|---|
| 929 | struct mem_cgroup *oom_domain); | 
|---|
| 930 | void mem_cgroup_print_oom_group(struct mem_cgroup *memcg); | 
|---|
| 931 |  | 
|---|
| 932 | /* idx can be of type enum memcg_stat_item or node_stat_item */ | 
|---|
| 933 | void mod_memcg_state(struct mem_cgroup *memcg, | 
|---|
| 934 | enum memcg_stat_item idx, int val); | 
|---|
| 935 |  | 
|---|
| 936 | static inline void mod_memcg_page_state(struct page *page, | 
|---|
| 937 | enum memcg_stat_item idx, int val) | 
|---|
| 938 | { | 
|---|
| 939 | struct mem_cgroup *memcg; | 
|---|
| 940 |  | 
|---|
| 941 | if (mem_cgroup_disabled()) | 
|---|
| 942 | return; | 
|---|
| 943 |  | 
|---|
| 944 | rcu_read_lock(); | 
|---|
| 945 | memcg = folio_memcg(page_folio(page)); | 
|---|
| 946 | if (memcg) | 
|---|
| 947 | mod_memcg_state(memcg, idx, val); | 
|---|
| 948 | rcu_read_unlock(); | 
|---|
| 949 | } | 
|---|
| 950 |  | 
|---|
| 951 | unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx); | 
|---|
| 952 | unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx); | 
|---|
| 953 | unsigned long lruvec_page_state_local(struct lruvec *lruvec, | 
|---|
| 954 | enum node_stat_item idx); | 
|---|
| 955 |  | 
|---|
| 956 | void mem_cgroup_flush_stats(struct mem_cgroup *memcg); | 
|---|
| 957 | void mem_cgroup_flush_stats_ratelimited(struct mem_cgroup *memcg); | 
|---|
| 958 |  | 
|---|
| 959 | void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, int val); | 
|---|
| 960 |  | 
|---|
| 961 | static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx, | 
|---|
| 962 | int val) | 
|---|
| 963 | { | 
|---|
| 964 | unsigned long flags; | 
|---|
| 965 |  | 
|---|
| 966 | local_irq_save(flags); | 
|---|
| 967 | __mod_lruvec_kmem_state(p, idx, val); | 
|---|
| 968 | local_irq_restore(flags); | 
|---|
| 969 | } | 
|---|
| 970 |  | 
|---|
| 971 | void count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx, | 
|---|
| 972 | unsigned long count); | 
|---|
| 973 |  | 
|---|
| 974 | static inline void count_memcg_folio_events(struct folio *folio, | 
|---|
| 975 | enum vm_event_item idx, unsigned long nr) | 
|---|
| 976 | { | 
|---|
| 977 | struct mem_cgroup *memcg = folio_memcg(folio); | 
|---|
| 978 |  | 
|---|
| 979 | if (memcg) | 
|---|
| 980 | count_memcg_events(memcg, idx, nr); | 
|---|
| 981 | } | 
|---|
| 982 |  | 
|---|
| 983 | static inline void count_memcg_events_mm(struct mm_struct *mm, | 
|---|
| 984 | enum vm_event_item idx, unsigned long count) | 
|---|
| 985 | { | 
|---|
| 986 | struct mem_cgroup *memcg; | 
|---|
| 987 |  | 
|---|
| 988 | if (mem_cgroup_disabled()) | 
|---|
| 989 | return; | 
|---|
| 990 |  | 
|---|
| 991 | rcu_read_lock(); | 
|---|
| 992 | memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); | 
|---|
| 993 | if (likely(memcg)) | 
|---|
| 994 | count_memcg_events(memcg, idx, count); | 
|---|
| 995 | rcu_read_unlock(); | 
|---|
| 996 | } | 
|---|
| 997 |  | 
|---|
| 998 | static inline void count_memcg_event_mm(struct mm_struct *mm, | 
|---|
| 999 | enum vm_event_item idx) | 
|---|
| 1000 | { | 
|---|
| 1001 | count_memcg_events_mm(mm, idx, 1); | 
|---|
| 1002 | } | 
|---|
| 1003 |  | 
|---|
| 1004 | static inline void __memcg_memory_event(struct mem_cgroup *memcg, | 
|---|
| 1005 | enum memcg_memory_event event, | 
|---|
| 1006 | bool allow_spinning) | 
|---|
| 1007 | { | 
|---|
| 1008 | bool swap_event = event == MEMCG_SWAP_HIGH || event == MEMCG_SWAP_MAX || | 
|---|
| 1009 | event == MEMCG_SWAP_FAIL; | 
|---|
| 1010 |  | 
|---|
| 1011 | /* For now only MEMCG_MAX can happen with !allow_spinning context. */ | 
|---|
| 1012 | VM_WARN_ON_ONCE(!allow_spinning && event != MEMCG_MAX); | 
|---|
| 1013 |  | 
|---|
| 1014 | atomic_long_inc(&memcg->memory_events_local[event]); | 
|---|
| 1015 | if (!swap_event && allow_spinning) | 
|---|
| 1016 | cgroup_file_notify(&memcg->events_local_file); | 
|---|
| 1017 |  | 
|---|
| 1018 | do { | 
|---|
| 1019 | atomic_long_inc(&memcg->memory_events[event]); | 
|---|
| 1020 | if (allow_spinning) { | 
|---|
| 1021 | if (swap_event) | 
|---|
| 1022 | cgroup_file_notify(&memcg->swap_events_file); | 
|---|
| 1023 | else | 
|---|
| 1024 | cgroup_file_notify(&memcg->events_file); | 
|---|
| 1025 | } | 
|---|
| 1026 |  | 
|---|
| 1027 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) | 
|---|
| 1028 | break; | 
|---|
| 1029 | if (cgrp_dfl_root.flags & CGRP_ROOT_MEMORY_LOCAL_EVENTS) | 
|---|
| 1030 | break; | 
|---|
| 1031 | } while ((memcg = parent_mem_cgroup(memcg)) && | 
|---|
| 1032 | !mem_cgroup_is_root(memcg)); | 
|---|
| 1033 | } | 
|---|
| 1034 |  | 
|---|
| 1035 | static inline void memcg_memory_event(struct mem_cgroup *memcg, | 
|---|
| 1036 | enum memcg_memory_event event) | 
|---|
| 1037 | { | 
|---|
| 1038 | __memcg_memory_event(memcg, event, true); | 
|---|
| 1039 | } | 
|---|
| 1040 |  | 
|---|
| 1041 | static inline void memcg_memory_event_mm(struct mm_struct *mm, | 
|---|
| 1042 | enum memcg_memory_event event) | 
|---|
| 1043 | { | 
|---|
| 1044 | struct mem_cgroup *memcg; | 
|---|
| 1045 |  | 
|---|
| 1046 | if (mem_cgroup_disabled()) | 
|---|
| 1047 | return; | 
|---|
| 1048 |  | 
|---|
| 1049 | rcu_read_lock(); | 
|---|
| 1050 | memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); | 
|---|
| 1051 | if (likely(memcg)) | 
|---|
| 1052 | memcg_memory_event(memcg, event); | 
|---|
| 1053 | rcu_read_unlock(); | 
|---|
| 1054 | } | 
|---|
| 1055 |  | 
|---|
| 1056 | void split_page_memcg(struct page *first, unsigned order); | 
|---|
| 1057 | void folio_split_memcg_refs(struct folio *folio, unsigned old_order, | 
|---|
| 1058 | unsigned new_order); | 
|---|
| 1059 |  | 
|---|
| 1060 | static inline u64 cgroup_id_from_mm(struct mm_struct *mm) | 
|---|
| 1061 | { | 
|---|
| 1062 | struct mem_cgroup *memcg; | 
|---|
| 1063 | u64 id; | 
|---|
| 1064 |  | 
|---|
| 1065 | if (mem_cgroup_disabled()) | 
|---|
| 1066 | return 0; | 
|---|
| 1067 |  | 
|---|
| 1068 | rcu_read_lock(); | 
|---|
| 1069 | memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); | 
|---|
| 1070 | if (!memcg) | 
|---|
| 1071 | memcg = root_mem_cgroup; | 
|---|
| 1072 | id = cgroup_id(memcg->css.cgroup); | 
|---|
| 1073 | rcu_read_unlock(); | 
|---|
| 1074 | return id; | 
|---|
| 1075 | } | 
|---|
| 1076 |  | 
|---|
| 1077 | extern int mem_cgroup_init(void); | 
|---|
| 1078 | #else /* CONFIG_MEMCG */ | 
|---|
| 1079 |  | 
|---|
| 1080 | #define MEM_CGROUP_ID_SHIFT	0 | 
|---|
| 1081 |  | 
|---|
| 1082 | #define root_mem_cgroup		(NULL) | 
|---|
| 1083 |  | 
|---|
| 1084 | static inline struct mem_cgroup *folio_memcg(struct folio *folio) | 
|---|
| 1085 | { | 
|---|
| 1086 | return NULL; | 
|---|
| 1087 | } | 
|---|
| 1088 |  | 
|---|
| 1089 | static inline bool folio_memcg_charged(struct folio *folio) | 
|---|
| 1090 | { | 
|---|
| 1091 | return false; | 
|---|
| 1092 | } | 
|---|
| 1093 |  | 
|---|
| 1094 | static inline struct mem_cgroup *folio_memcg_check(struct folio *folio) | 
|---|
| 1095 | { | 
|---|
| 1096 | return NULL; | 
|---|
| 1097 | } | 
|---|
| 1098 |  | 
|---|
| 1099 | static inline struct mem_cgroup *page_memcg_check(struct page *page) | 
|---|
| 1100 | { | 
|---|
| 1101 | return NULL; | 
|---|
| 1102 | } | 
|---|
| 1103 |  | 
|---|
| 1104 | static inline struct mem_cgroup *get_mem_cgroup_from_objcg(struct obj_cgroup *objcg) | 
|---|
| 1105 | { | 
|---|
| 1106 | return NULL; | 
|---|
| 1107 | } | 
|---|
| 1108 |  | 
|---|
| 1109 | static inline bool folio_memcg_kmem(struct folio *folio) | 
|---|
| 1110 | { | 
|---|
| 1111 | return false; | 
|---|
| 1112 | } | 
|---|
| 1113 |  | 
|---|
| 1114 | static inline bool PageMemcgKmem(struct page *page) | 
|---|
| 1115 | { | 
|---|
| 1116 | return false; | 
|---|
| 1117 | } | 
|---|
| 1118 |  | 
|---|
| 1119 | static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg) | 
|---|
| 1120 | { | 
|---|
| 1121 | return true; | 
|---|
| 1122 | } | 
|---|
| 1123 |  | 
|---|
| 1124 | static inline bool mem_cgroup_disabled(void) | 
|---|
| 1125 | { | 
|---|
| 1126 | return true; | 
|---|
| 1127 | } | 
|---|
| 1128 |  | 
|---|
| 1129 | static inline void memcg_memory_event(struct mem_cgroup *memcg, | 
|---|
| 1130 | enum memcg_memory_event event) | 
|---|
| 1131 | { | 
|---|
| 1132 | } | 
|---|
| 1133 |  | 
|---|
| 1134 | static inline void memcg_memory_event_mm(struct mm_struct *mm, | 
|---|
| 1135 | enum memcg_memory_event event) | 
|---|
| 1136 | { | 
|---|
| 1137 | } | 
|---|
| 1138 |  | 
|---|
| 1139 | static inline void mem_cgroup_protection(struct mem_cgroup *root, | 
|---|
| 1140 | struct mem_cgroup *memcg, | 
|---|
| 1141 | unsigned long *min, | 
|---|
| 1142 | unsigned long *low) | 
|---|
| 1143 | { | 
|---|
| 1144 | *min = *low = 0; | 
|---|
| 1145 | } | 
|---|
| 1146 |  | 
|---|
| 1147 | static inline void mem_cgroup_calculate_protection(struct mem_cgroup *root, | 
|---|
| 1148 | struct mem_cgroup *memcg) | 
|---|
| 1149 | { | 
|---|
| 1150 | } | 
|---|
| 1151 |  | 
|---|
| 1152 | static inline bool mem_cgroup_unprotected(struct mem_cgroup *target, | 
|---|
| 1153 | struct mem_cgroup *memcg) | 
|---|
| 1154 | { | 
|---|
| 1155 | return true; | 
|---|
| 1156 | } | 
|---|
| 1157 | static inline bool mem_cgroup_below_low(struct mem_cgroup *target, | 
|---|
| 1158 | struct mem_cgroup *memcg) | 
|---|
| 1159 | { | 
|---|
| 1160 | return false; | 
|---|
| 1161 | } | 
|---|
| 1162 |  | 
|---|
| 1163 | static inline bool mem_cgroup_below_min(struct mem_cgroup *target, | 
|---|
| 1164 | struct mem_cgroup *memcg) | 
|---|
| 1165 | { | 
|---|
| 1166 | return false; | 
|---|
| 1167 | } | 
|---|
| 1168 |  | 
|---|
| 1169 | static inline int mem_cgroup_charge(struct folio *folio, | 
|---|
| 1170 | struct mm_struct *mm, gfp_t gfp) | 
|---|
| 1171 | { | 
|---|
| 1172 | return 0; | 
|---|
| 1173 | } | 
|---|
| 1174 |  | 
|---|
| 1175 | static inline int mem_cgroup_charge_hugetlb(struct folio* folio, gfp_t gfp) | 
|---|
| 1176 | { | 
|---|
| 1177 | return 0; | 
|---|
| 1178 | } | 
|---|
| 1179 |  | 
|---|
| 1180 | static inline int mem_cgroup_swapin_charge_folio(struct folio *folio, | 
|---|
| 1181 | struct mm_struct *mm, gfp_t gfp, swp_entry_t entry) | 
|---|
| 1182 | { | 
|---|
| 1183 | return 0; | 
|---|
| 1184 | } | 
|---|
| 1185 |  | 
|---|
| 1186 | static inline void mem_cgroup_uncharge(struct folio *folio) | 
|---|
| 1187 | { | 
|---|
| 1188 | } | 
|---|
| 1189 |  | 
|---|
| 1190 | static inline void mem_cgroup_uncharge_folios(struct folio_batch *folios) | 
|---|
| 1191 | { | 
|---|
| 1192 | } | 
|---|
| 1193 |  | 
|---|
| 1194 | static inline void mem_cgroup_replace_folio(struct folio *old, | 
|---|
| 1195 | struct folio *new) | 
|---|
| 1196 | { | 
|---|
| 1197 | } | 
|---|
| 1198 |  | 
|---|
| 1199 | static inline void mem_cgroup_migrate(struct folio *old, struct folio *new) | 
|---|
| 1200 | { | 
|---|
| 1201 | } | 
|---|
| 1202 |  | 
|---|
| 1203 | static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg, | 
|---|
| 1204 | struct pglist_data *pgdat) | 
|---|
| 1205 | { | 
|---|
| 1206 | return &pgdat->__lruvec; | 
|---|
| 1207 | } | 
|---|
| 1208 |  | 
|---|
| 1209 | static inline struct lruvec *folio_lruvec(struct folio *folio) | 
|---|
| 1210 | { | 
|---|
| 1211 | struct pglist_data *pgdat = folio_pgdat(folio); | 
|---|
| 1212 | return &pgdat->__lruvec; | 
|---|
| 1213 | } | 
|---|
| 1214 |  | 
|---|
| 1215 | static inline | 
|---|
| 1216 | void lruvec_memcg_debug(struct lruvec *lruvec, struct folio *folio) | 
|---|
| 1217 | { | 
|---|
| 1218 | } | 
|---|
| 1219 |  | 
|---|
| 1220 | static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg) | 
|---|
| 1221 | { | 
|---|
| 1222 | return NULL; | 
|---|
| 1223 | } | 
|---|
| 1224 |  | 
|---|
| 1225 | static inline bool mm_match_cgroup(struct mm_struct *mm, | 
|---|
| 1226 | struct mem_cgroup *memcg) | 
|---|
| 1227 | { | 
|---|
| 1228 | return true; | 
|---|
| 1229 | } | 
|---|
| 1230 |  | 
|---|
| 1231 | static inline struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm) | 
|---|
| 1232 | { | 
|---|
| 1233 | return NULL; | 
|---|
| 1234 | } | 
|---|
| 1235 |  | 
|---|
| 1236 | static inline struct mem_cgroup *get_mem_cgroup_from_current(void) | 
|---|
| 1237 | { | 
|---|
| 1238 | return NULL; | 
|---|
| 1239 | } | 
|---|
| 1240 |  | 
|---|
| 1241 | static inline struct mem_cgroup *get_mem_cgroup_from_folio(struct folio *folio) | 
|---|
| 1242 | { | 
|---|
| 1243 | return NULL; | 
|---|
| 1244 | } | 
|---|
| 1245 |  | 
|---|
| 1246 | static inline | 
|---|
| 1247 | struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css) | 
|---|
| 1248 | { | 
|---|
| 1249 | return NULL; | 
|---|
| 1250 | } | 
|---|
| 1251 |  | 
|---|
| 1252 | static inline void obj_cgroup_get(struct obj_cgroup *objcg) | 
|---|
| 1253 | { | 
|---|
| 1254 | } | 
|---|
| 1255 |  | 
|---|
| 1256 | static inline void obj_cgroup_put(struct obj_cgroup *objcg) | 
|---|
| 1257 | { | 
|---|
| 1258 | } | 
|---|
| 1259 |  | 
|---|
| 1260 | static inline bool mem_cgroup_tryget(struct mem_cgroup *memcg) | 
|---|
| 1261 | { | 
|---|
| 1262 | return true; | 
|---|
| 1263 | } | 
|---|
| 1264 |  | 
|---|
| 1265 | static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg) | 
|---|
| 1266 | { | 
|---|
| 1267 | return true; | 
|---|
| 1268 | } | 
|---|
| 1269 |  | 
|---|
| 1270 | static inline void mem_cgroup_put(struct mem_cgroup *memcg) | 
|---|
| 1271 | { | 
|---|
| 1272 | } | 
|---|
| 1273 |  | 
|---|
| 1274 | static inline struct lruvec *folio_lruvec_lock(struct folio *folio) | 
|---|
| 1275 | { | 
|---|
| 1276 | struct pglist_data *pgdat = folio_pgdat(folio); | 
|---|
| 1277 |  | 
|---|
| 1278 | spin_lock(lock: &pgdat->__lruvec.lru_lock); | 
|---|
| 1279 | return &pgdat->__lruvec; | 
|---|
| 1280 | } | 
|---|
| 1281 |  | 
|---|
| 1282 | static inline struct lruvec *folio_lruvec_lock_irq(struct folio *folio) | 
|---|
| 1283 | { | 
|---|
| 1284 | struct pglist_data *pgdat = folio_pgdat(folio); | 
|---|
| 1285 |  | 
|---|
| 1286 | spin_lock_irq(lock: &pgdat->__lruvec.lru_lock); | 
|---|
| 1287 | return &pgdat->__lruvec; | 
|---|
| 1288 | } | 
|---|
| 1289 |  | 
|---|
| 1290 | static inline struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio, | 
|---|
| 1291 | unsigned long *flagsp) | 
|---|
| 1292 | { | 
|---|
| 1293 | struct pglist_data *pgdat = folio_pgdat(folio); | 
|---|
| 1294 |  | 
|---|
| 1295 | spin_lock_irqsave(&pgdat->__lruvec.lru_lock, *flagsp); | 
|---|
| 1296 | return &pgdat->__lruvec; | 
|---|
| 1297 | } | 
|---|
| 1298 |  | 
|---|
| 1299 | static inline struct mem_cgroup * | 
|---|
| 1300 | mem_cgroup_iter(struct mem_cgroup *root, | 
|---|
| 1301 | struct mem_cgroup *prev, | 
|---|
| 1302 | struct mem_cgroup_reclaim_cookie *reclaim) | 
|---|
| 1303 | { | 
|---|
| 1304 | return NULL; | 
|---|
| 1305 | } | 
|---|
| 1306 |  | 
|---|
| 1307 | static inline void mem_cgroup_iter_break(struct mem_cgroup *root, | 
|---|
| 1308 | struct mem_cgroup *prev) | 
|---|
| 1309 | { | 
|---|
| 1310 | } | 
|---|
| 1311 |  | 
|---|
| 1312 | static inline void mem_cgroup_scan_tasks(struct mem_cgroup *memcg, | 
|---|
| 1313 | int (*fn)(struct task_struct *, void *), void *arg) | 
|---|
| 1314 | { | 
|---|
| 1315 | } | 
|---|
| 1316 |  | 
|---|
| 1317 | static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg) | 
|---|
| 1318 | { | 
|---|
| 1319 | return 0; | 
|---|
| 1320 | } | 
|---|
| 1321 |  | 
|---|
| 1322 | static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id) | 
|---|
| 1323 | { | 
|---|
| 1324 | WARN_ON_ONCE(id); | 
|---|
| 1325 | /* XXX: This should always return root_mem_cgroup */ | 
|---|
| 1326 | return NULL; | 
|---|
| 1327 | } | 
|---|
| 1328 |  | 
|---|
| 1329 | #ifdef CONFIG_SHRINKER_DEBUG | 
|---|
| 1330 | static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg) | 
|---|
| 1331 | { | 
|---|
| 1332 | return 0; | 
|---|
| 1333 | } | 
|---|
| 1334 |  | 
|---|
| 1335 | static inline struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino) | 
|---|
| 1336 | { | 
|---|
| 1337 | return NULL; | 
|---|
| 1338 | } | 
|---|
| 1339 | #endif | 
|---|
| 1340 |  | 
|---|
| 1341 | static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m) | 
|---|
| 1342 | { | 
|---|
| 1343 | return NULL; | 
|---|
| 1344 | } | 
|---|
| 1345 |  | 
|---|
| 1346 | static inline struct mem_cgroup *lruvec_memcg(struct lruvec *lruvec) | 
|---|
| 1347 | { | 
|---|
| 1348 | return NULL; | 
|---|
| 1349 | } | 
|---|
| 1350 |  | 
|---|
| 1351 | static inline bool mem_cgroup_online(struct mem_cgroup *memcg) | 
|---|
| 1352 | { | 
|---|
| 1353 | return true; | 
|---|
| 1354 | } | 
|---|
| 1355 |  | 
|---|
| 1356 | static inline | 
|---|
| 1357 | unsigned long mem_cgroup_get_zone_lru_size(struct lruvec *lruvec, | 
|---|
| 1358 | enum lru_list lru, int zone_idx) | 
|---|
| 1359 | { | 
|---|
| 1360 | return 0; | 
|---|
| 1361 | } | 
|---|
| 1362 |  | 
|---|
| 1363 | static inline unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg) | 
|---|
| 1364 | { | 
|---|
| 1365 | return 0; | 
|---|
| 1366 | } | 
|---|
| 1367 |  | 
|---|
| 1368 | static inline unsigned long mem_cgroup_size(struct mem_cgroup *memcg) | 
|---|
| 1369 | { | 
|---|
| 1370 | return 0; | 
|---|
| 1371 | } | 
|---|
| 1372 |  | 
|---|
| 1373 | static inline void | 
|---|
| 1374 | mem_cgroup_print_oom_context(struct mem_cgroup *memcg, struct task_struct *p) | 
|---|
| 1375 | { | 
|---|
| 1376 | } | 
|---|
| 1377 |  | 
|---|
| 1378 | static inline void | 
|---|
| 1379 | mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg) | 
|---|
| 1380 | { | 
|---|
| 1381 | } | 
|---|
| 1382 |  | 
|---|
| 1383 | static inline void mem_cgroup_handle_over_high(gfp_t gfp_mask) | 
|---|
| 1384 | { | 
|---|
| 1385 | } | 
|---|
| 1386 |  | 
|---|
| 1387 | static inline struct mem_cgroup *mem_cgroup_get_oom_group( | 
|---|
| 1388 | struct task_struct *victim, struct mem_cgroup *oom_domain) | 
|---|
| 1389 | { | 
|---|
| 1390 | return NULL; | 
|---|
| 1391 | } | 
|---|
| 1392 |  | 
|---|
| 1393 | static inline void mem_cgroup_print_oom_group(struct mem_cgroup *memcg) | 
|---|
| 1394 | { | 
|---|
| 1395 | } | 
|---|
| 1396 |  | 
|---|
| 1397 | static inline void mod_memcg_state(struct mem_cgroup *memcg, | 
|---|
| 1398 | enum memcg_stat_item idx, | 
|---|
| 1399 | int nr) | 
|---|
| 1400 | { | 
|---|
| 1401 | } | 
|---|
| 1402 |  | 
|---|
| 1403 | static inline void mod_memcg_page_state(struct page *page, | 
|---|
| 1404 | enum memcg_stat_item idx, int val) | 
|---|
| 1405 | { | 
|---|
| 1406 | } | 
|---|
| 1407 |  | 
|---|
| 1408 | static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx) | 
|---|
| 1409 | { | 
|---|
| 1410 | return 0; | 
|---|
| 1411 | } | 
|---|
| 1412 |  | 
|---|
| 1413 | static inline unsigned long lruvec_page_state(struct lruvec *lruvec, | 
|---|
| 1414 | enum node_stat_item idx) | 
|---|
| 1415 | { | 
|---|
| 1416 | return node_page_state(pgdat: lruvec_pgdat(lruvec), item: idx); | 
|---|
| 1417 | } | 
|---|
| 1418 |  | 
|---|
| 1419 | static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec, | 
|---|
| 1420 | enum node_stat_item idx) | 
|---|
| 1421 | { | 
|---|
| 1422 | return node_page_state(pgdat: lruvec_pgdat(lruvec), item: idx); | 
|---|
| 1423 | } | 
|---|
| 1424 |  | 
|---|
| 1425 | static inline void mem_cgroup_flush_stats(struct mem_cgroup *memcg) | 
|---|
| 1426 | { | 
|---|
| 1427 | } | 
|---|
| 1428 |  | 
|---|
| 1429 | static inline void mem_cgroup_flush_stats_ratelimited(struct mem_cgroup *memcg) | 
|---|
| 1430 | { | 
|---|
| 1431 | } | 
|---|
| 1432 |  | 
|---|
| 1433 | static inline void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, | 
|---|
| 1434 | int val) | 
|---|
| 1435 | { | 
|---|
| 1436 | struct page *page = virt_to_head_page(x: p); | 
|---|
| 1437 |  | 
|---|
| 1438 | __mod_node_page_state(page_pgdat(page), item: idx, val); | 
|---|
| 1439 | } | 
|---|
| 1440 |  | 
|---|
| 1441 | static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx, | 
|---|
| 1442 | int val) | 
|---|
| 1443 | { | 
|---|
| 1444 | struct page *page = virt_to_head_page(x: p); | 
|---|
| 1445 |  | 
|---|
| 1446 | mod_node_page_state(page_pgdat(page), idx, val); | 
|---|
| 1447 | } | 
|---|
| 1448 |  | 
|---|
| 1449 | static inline void count_memcg_events(struct mem_cgroup *memcg, | 
|---|
| 1450 | enum vm_event_item idx, | 
|---|
| 1451 | unsigned long count) | 
|---|
| 1452 | { | 
|---|
| 1453 | } | 
|---|
| 1454 |  | 
|---|
| 1455 | static inline void count_memcg_folio_events(struct folio *folio, | 
|---|
| 1456 | enum vm_event_item idx, unsigned long nr) | 
|---|
| 1457 | { | 
|---|
| 1458 | } | 
|---|
| 1459 |  | 
|---|
| 1460 | static inline void count_memcg_events_mm(struct mm_struct *mm, | 
|---|
| 1461 | enum vm_event_item idx, unsigned long count) | 
|---|
| 1462 | { | 
|---|
| 1463 | } | 
|---|
| 1464 |  | 
|---|
| 1465 | static inline | 
|---|
| 1466 | void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx) | 
|---|
| 1467 | { | 
|---|
| 1468 | } | 
|---|
| 1469 |  | 
|---|
| 1470 | static inline void split_page_memcg(struct page *first, unsigned order) | 
|---|
| 1471 | { | 
|---|
| 1472 | } | 
|---|
| 1473 |  | 
|---|
| 1474 | static inline void folio_split_memcg_refs(struct folio *folio, | 
|---|
| 1475 | unsigned old_order, unsigned new_order) | 
|---|
| 1476 | { | 
|---|
| 1477 | } | 
|---|
| 1478 |  | 
|---|
| 1479 | static inline u64 cgroup_id_from_mm(struct mm_struct *mm) | 
|---|
| 1480 | { | 
|---|
| 1481 | return 0; | 
|---|
| 1482 | } | 
|---|
| 1483 |  | 
|---|
| 1484 | static inline int mem_cgroup_init(void) { return 0; } | 
|---|
| 1485 | #endif /* CONFIG_MEMCG */ | 
|---|
| 1486 |  | 
|---|
| 1487 | /* | 
|---|
| 1488 | * Extended information for slab objects stored as an array in page->memcg_data | 
|---|
| 1489 | * if MEMCG_DATA_OBJEXTS is set. | 
|---|
| 1490 | */ | 
|---|
| 1491 | struct slabobj_ext { | 
|---|
| 1492 | #ifdef CONFIG_MEMCG | 
|---|
| 1493 | struct obj_cgroup *objcg; | 
|---|
| 1494 | #endif | 
|---|
| 1495 | #ifdef CONFIG_MEM_ALLOC_PROFILING | 
|---|
| 1496 | union codetag_ref ref; | 
|---|
| 1497 | #endif | 
|---|
| 1498 | } __aligned(8); | 
|---|
| 1499 |  | 
|---|
| 1500 | static inline void __inc_lruvec_kmem_state(void *p, enum node_stat_item idx) | 
|---|
| 1501 | { | 
|---|
| 1502 | __mod_lruvec_kmem_state(p, idx, val: 1); | 
|---|
| 1503 | } | 
|---|
| 1504 |  | 
|---|
| 1505 | static inline void __dec_lruvec_kmem_state(void *p, enum node_stat_item idx) | 
|---|
| 1506 | { | 
|---|
| 1507 | __mod_lruvec_kmem_state(p, idx, val: -1); | 
|---|
| 1508 | } | 
|---|
| 1509 |  | 
|---|
| 1510 | static inline struct lruvec *parent_lruvec(struct lruvec *lruvec) | 
|---|
| 1511 | { | 
|---|
| 1512 | struct mem_cgroup *memcg; | 
|---|
| 1513 |  | 
|---|
| 1514 | memcg = lruvec_memcg(lruvec); | 
|---|
| 1515 | if (!memcg) | 
|---|
| 1516 | return NULL; | 
|---|
| 1517 | memcg = parent_mem_cgroup(memcg); | 
|---|
| 1518 | if (!memcg) | 
|---|
| 1519 | return NULL; | 
|---|
| 1520 | return mem_cgroup_lruvec(memcg, pgdat: lruvec_pgdat(lruvec)); | 
|---|
| 1521 | } | 
|---|
| 1522 |  | 
|---|
| 1523 | static inline void unlock_page_lruvec(struct lruvec *lruvec) | 
|---|
| 1524 | { | 
|---|
| 1525 | spin_unlock(lock: &lruvec->lru_lock); | 
|---|
| 1526 | } | 
|---|
| 1527 |  | 
|---|
| 1528 | static inline void unlock_page_lruvec_irq(struct lruvec *lruvec) | 
|---|
| 1529 | { | 
|---|
| 1530 | spin_unlock_irq(lock: &lruvec->lru_lock); | 
|---|
| 1531 | } | 
|---|
| 1532 |  | 
|---|
| 1533 | static inline void unlock_page_lruvec_irqrestore(struct lruvec *lruvec, | 
|---|
| 1534 | unsigned long flags) | 
|---|
| 1535 | { | 
|---|
| 1536 | spin_unlock_irqrestore(lock: &lruvec->lru_lock, flags); | 
|---|
| 1537 | } | 
|---|
| 1538 |  | 
|---|
| 1539 | /* Test requires a stable folio->memcg binding, see folio_memcg() */ | 
|---|
| 1540 | static inline bool folio_matches_lruvec(struct folio *folio, | 
|---|
| 1541 | struct lruvec *lruvec) | 
|---|
| 1542 | { | 
|---|
| 1543 | return lruvec_pgdat(lruvec) == folio_pgdat(folio) && | 
|---|
| 1544 | lruvec_memcg(lruvec) == folio_memcg(folio); | 
|---|
| 1545 | } | 
|---|
| 1546 |  | 
|---|
| 1547 | /* Don't lock again iff page's lruvec locked */ | 
|---|
| 1548 | static inline struct lruvec *folio_lruvec_relock_irq(struct folio *folio, | 
|---|
| 1549 | struct lruvec *locked_lruvec) | 
|---|
| 1550 | { | 
|---|
| 1551 | if (locked_lruvec) { | 
|---|
| 1552 | if (folio_matches_lruvec(folio, lruvec: locked_lruvec)) | 
|---|
| 1553 | return locked_lruvec; | 
|---|
| 1554 |  | 
|---|
| 1555 | unlock_page_lruvec_irq(lruvec: locked_lruvec); | 
|---|
| 1556 | } | 
|---|
| 1557 |  | 
|---|
| 1558 | return folio_lruvec_lock_irq(folio); | 
|---|
| 1559 | } | 
|---|
| 1560 |  | 
|---|
| 1561 | /* Don't lock again iff folio's lruvec locked */ | 
|---|
| 1562 | static inline void folio_lruvec_relock_irqsave(struct folio *folio, | 
|---|
| 1563 | struct lruvec **lruvecp, unsigned long *flags) | 
|---|
| 1564 | { | 
|---|
| 1565 | if (*lruvecp) { | 
|---|
| 1566 | if (folio_matches_lruvec(folio, lruvec: *lruvecp)) | 
|---|
| 1567 | return; | 
|---|
| 1568 |  | 
|---|
| 1569 | unlock_page_lruvec_irqrestore(lruvec: *lruvecp, flags: *flags); | 
|---|
| 1570 | } | 
|---|
| 1571 |  | 
|---|
| 1572 | *lruvecp = folio_lruvec_lock_irqsave(folio, flagsp: flags); | 
|---|
| 1573 | } | 
|---|
| 1574 |  | 
|---|
| 1575 | #ifdef CONFIG_CGROUP_WRITEBACK | 
|---|
| 1576 |  | 
|---|
| 1577 | struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb); | 
|---|
| 1578 | void mem_cgroup_wb_stats(struct bdi_writeback *wb, unsigned long *pfilepages, | 
|---|
| 1579 | unsigned long *pheadroom, unsigned long *pdirty, | 
|---|
| 1580 | unsigned long *pwriteback); | 
|---|
| 1581 |  | 
|---|
| 1582 | void mem_cgroup_track_foreign_dirty_slowpath(struct folio *folio, | 
|---|
| 1583 | struct bdi_writeback *wb); | 
|---|
| 1584 |  | 
|---|
| 1585 | static inline void mem_cgroup_track_foreign_dirty(struct folio *folio, | 
|---|
| 1586 | struct bdi_writeback *wb) | 
|---|
| 1587 | { | 
|---|
| 1588 | struct mem_cgroup *memcg; | 
|---|
| 1589 |  | 
|---|
| 1590 | if (mem_cgroup_disabled()) | 
|---|
| 1591 | return; | 
|---|
| 1592 |  | 
|---|
| 1593 | memcg = folio_memcg(folio); | 
|---|
| 1594 | if (unlikely(memcg && &memcg->css != wb->memcg_css)) | 
|---|
| 1595 | mem_cgroup_track_foreign_dirty_slowpath(folio, wb); | 
|---|
| 1596 | } | 
|---|
| 1597 |  | 
|---|
| 1598 | void mem_cgroup_flush_foreign(struct bdi_writeback *wb); | 
|---|
| 1599 |  | 
|---|
| 1600 | #else	/* CONFIG_CGROUP_WRITEBACK */ | 
|---|
| 1601 |  | 
|---|
| 1602 | static inline struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb) | 
|---|
| 1603 | { | 
|---|
| 1604 | return NULL; | 
|---|
| 1605 | } | 
|---|
| 1606 |  | 
|---|
| 1607 | static inline void mem_cgroup_wb_stats(struct bdi_writeback *wb, | 
|---|
| 1608 | unsigned long *pfilepages, | 
|---|
| 1609 | unsigned long *pheadroom, | 
|---|
| 1610 | unsigned long *pdirty, | 
|---|
| 1611 | unsigned long *pwriteback) | 
|---|
| 1612 | { | 
|---|
| 1613 | } | 
|---|
| 1614 |  | 
|---|
| 1615 | static inline void mem_cgroup_track_foreign_dirty(struct folio *folio, | 
|---|
| 1616 | struct bdi_writeback *wb) | 
|---|
| 1617 | { | 
|---|
| 1618 | } | 
|---|
| 1619 |  | 
|---|
| 1620 | static inline void mem_cgroup_flush_foreign(struct bdi_writeback *wb) | 
|---|
| 1621 | { | 
|---|
| 1622 | } | 
|---|
| 1623 |  | 
|---|
| 1624 | #endif	/* CONFIG_CGROUP_WRITEBACK */ | 
|---|
| 1625 |  | 
|---|
| 1626 | struct sock; | 
|---|
| 1627 | #ifdef CONFIG_MEMCG | 
|---|
| 1628 | extern struct static_key_false memcg_sockets_enabled_key; | 
|---|
| 1629 | #define mem_cgroup_sockets_enabled static_branch_unlikely(&memcg_sockets_enabled_key) | 
|---|
| 1630 |  | 
|---|
| 1631 | void mem_cgroup_sk_alloc(struct sock *sk); | 
|---|
| 1632 | void mem_cgroup_sk_free(struct sock *sk); | 
|---|
| 1633 | void mem_cgroup_sk_inherit(const struct sock *sk, struct sock *newsk); | 
|---|
| 1634 | bool mem_cgroup_sk_charge(const struct sock *sk, unsigned int nr_pages, | 
|---|
| 1635 | gfp_t gfp_mask); | 
|---|
| 1636 | void mem_cgroup_sk_uncharge(const struct sock *sk, unsigned int nr_pages); | 
|---|
| 1637 |  | 
|---|
| 1638 | #if BITS_PER_LONG < 64 | 
|---|
| 1639 | static inline void mem_cgroup_set_socket_pressure(struct mem_cgroup *memcg) | 
|---|
| 1640 | { | 
|---|
| 1641 | u64 val = get_jiffies_64() + HZ; | 
|---|
| 1642 | unsigned long flags; | 
|---|
| 1643 |  | 
|---|
| 1644 | write_seqlock_irqsave(&memcg->socket_pressure_seqlock, flags); | 
|---|
| 1645 | memcg->socket_pressure = val; | 
|---|
| 1646 | write_sequnlock_irqrestore(&memcg->socket_pressure_seqlock, flags); | 
|---|
| 1647 | } | 
|---|
| 1648 |  | 
|---|
| 1649 | static inline u64 mem_cgroup_get_socket_pressure(struct mem_cgroup *memcg) | 
|---|
| 1650 | { | 
|---|
| 1651 | unsigned int seq; | 
|---|
| 1652 | u64 val; | 
|---|
| 1653 |  | 
|---|
| 1654 | do { | 
|---|
| 1655 | seq = read_seqbegin(&memcg->socket_pressure_seqlock); | 
|---|
| 1656 | val = memcg->socket_pressure; | 
|---|
| 1657 | } while (read_seqretry(&memcg->socket_pressure_seqlock, seq)); | 
|---|
| 1658 |  | 
|---|
| 1659 | return val; | 
|---|
| 1660 | } | 
|---|
| 1661 | #else | 
|---|
| 1662 | static inline void mem_cgroup_set_socket_pressure(struct mem_cgroup *memcg) | 
|---|
| 1663 | { | 
|---|
| 1664 | WRITE_ONCE(memcg->socket_pressure, jiffies + HZ); | 
|---|
| 1665 | } | 
|---|
| 1666 |  | 
|---|
| 1667 | static inline u64 mem_cgroup_get_socket_pressure(struct mem_cgroup *memcg) | 
|---|
| 1668 | { | 
|---|
| 1669 | return READ_ONCE(memcg->socket_pressure); | 
|---|
| 1670 | } | 
|---|
| 1671 | #endif | 
|---|
| 1672 |  | 
|---|
| 1673 | int alloc_shrinker_info(struct mem_cgroup *memcg); | 
|---|
| 1674 | void free_shrinker_info(struct mem_cgroup *memcg); | 
|---|
| 1675 | void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id); | 
|---|
| 1676 | void reparent_shrinker_deferred(struct mem_cgroup *memcg); | 
|---|
| 1677 | #else | 
|---|
| 1678 | #define mem_cgroup_sockets_enabled 0 | 
|---|
| 1679 |  | 
|---|
| 1680 | static inline void mem_cgroup_sk_alloc(struct sock *sk) | 
|---|
| 1681 | { | 
|---|
| 1682 | } | 
|---|
| 1683 |  | 
|---|
| 1684 | static inline void mem_cgroup_sk_free(struct sock *sk) | 
|---|
| 1685 | { | 
|---|
| 1686 | } | 
|---|
| 1687 |  | 
|---|
| 1688 | static inline void mem_cgroup_sk_inherit(const struct sock *sk, struct sock *newsk) | 
|---|
| 1689 | { | 
|---|
| 1690 | } | 
|---|
| 1691 |  | 
|---|
| 1692 | static inline bool mem_cgroup_sk_charge(const struct sock *sk, | 
|---|
| 1693 | unsigned int nr_pages, | 
|---|
| 1694 | gfp_t gfp_mask) | 
|---|
| 1695 | { | 
|---|
| 1696 | return false; | 
|---|
| 1697 | } | 
|---|
| 1698 |  | 
|---|
| 1699 | static inline void mem_cgroup_sk_uncharge(const struct sock *sk, | 
|---|
| 1700 | unsigned int nr_pages) | 
|---|
| 1701 | { | 
|---|
| 1702 | } | 
|---|
| 1703 |  | 
|---|
| 1704 | static inline void set_shrinker_bit(struct mem_cgroup *memcg, | 
|---|
| 1705 | int nid, int shrinker_id) | 
|---|
| 1706 | { | 
|---|
| 1707 | } | 
|---|
| 1708 | #endif | 
|---|
| 1709 |  | 
|---|
| 1710 | #ifdef CONFIG_MEMCG | 
|---|
| 1711 | bool mem_cgroup_kmem_disabled(void); | 
|---|
| 1712 | int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order); | 
|---|
| 1713 | void __memcg_kmem_uncharge_page(struct page *page, int order); | 
|---|
| 1714 |  | 
|---|
| 1715 | /* | 
|---|
| 1716 | * The returned objcg pointer is safe to use without additional | 
|---|
| 1717 | * protection within a scope. The scope is defined either by | 
|---|
| 1718 | * the current task (similar to the "current" global variable) | 
|---|
| 1719 | * or by set_active_memcg() pair. | 
|---|
| 1720 | * Please, use obj_cgroup_get() to get a reference if the pointer | 
|---|
| 1721 | * needs to be used outside of the local scope. | 
|---|
| 1722 | */ | 
|---|
| 1723 | struct obj_cgroup *current_obj_cgroup(void); | 
|---|
| 1724 | struct obj_cgroup *get_obj_cgroup_from_folio(struct folio *folio); | 
|---|
| 1725 |  | 
|---|
| 1726 | static inline struct obj_cgroup *get_obj_cgroup_from_current(void) | 
|---|
| 1727 | { | 
|---|
| 1728 | struct obj_cgroup *objcg = current_obj_cgroup(); | 
|---|
| 1729 |  | 
|---|
| 1730 | if (objcg) | 
|---|
| 1731 | obj_cgroup_get(objcg); | 
|---|
| 1732 |  | 
|---|
| 1733 | return objcg; | 
|---|
| 1734 | } | 
|---|
| 1735 |  | 
|---|
| 1736 | int obj_cgroup_charge(struct obj_cgroup *objcg, gfp_t gfp, size_t size); | 
|---|
| 1737 | void obj_cgroup_uncharge(struct obj_cgroup *objcg, size_t size); | 
|---|
| 1738 |  | 
|---|
| 1739 | extern struct static_key_false memcg_bpf_enabled_key; | 
|---|
| 1740 | static inline bool memcg_bpf_enabled(void) | 
|---|
| 1741 | { | 
|---|
| 1742 | return static_branch_likely(&memcg_bpf_enabled_key); | 
|---|
| 1743 | } | 
|---|
| 1744 |  | 
|---|
| 1745 | extern struct static_key_false memcg_kmem_online_key; | 
|---|
| 1746 |  | 
|---|
| 1747 | static inline bool memcg_kmem_online(void) | 
|---|
| 1748 | { | 
|---|
| 1749 | return static_branch_likely(&memcg_kmem_online_key); | 
|---|
| 1750 | } | 
|---|
| 1751 |  | 
|---|
| 1752 | static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp, | 
|---|
| 1753 | int order) | 
|---|
| 1754 | { | 
|---|
| 1755 | if (memcg_kmem_online()) | 
|---|
| 1756 | return __memcg_kmem_charge_page(page, gfp, order); | 
|---|
| 1757 | return 0; | 
|---|
| 1758 | } | 
|---|
| 1759 |  | 
|---|
| 1760 | static inline void memcg_kmem_uncharge_page(struct page *page, int order) | 
|---|
| 1761 | { | 
|---|
| 1762 | if (memcg_kmem_online()) | 
|---|
| 1763 | __memcg_kmem_uncharge_page(page, order); | 
|---|
| 1764 | } | 
|---|
| 1765 |  | 
|---|
| 1766 | /* | 
|---|
| 1767 | * A helper for accessing memcg's kmem_id, used for getting | 
|---|
| 1768 | * corresponding LRU lists. | 
|---|
| 1769 | */ | 
|---|
| 1770 | static inline int memcg_kmem_id(struct mem_cgroup *memcg) | 
|---|
| 1771 | { | 
|---|
| 1772 | return memcg ? memcg->kmemcg_id : -1; | 
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| 1773 | } | 
|---|
| 1774 |  | 
|---|
| 1775 | struct mem_cgroup *mem_cgroup_from_slab_obj(void *p); | 
|---|
| 1776 |  | 
|---|
| 1777 | static inline void count_objcg_events(struct obj_cgroup *objcg, | 
|---|
| 1778 | enum vm_event_item idx, | 
|---|
| 1779 | unsigned long count) | 
|---|
| 1780 | { | 
|---|
| 1781 | struct mem_cgroup *memcg; | 
|---|
| 1782 |  | 
|---|
| 1783 | if (!memcg_kmem_online()) | 
|---|
| 1784 | return; | 
|---|
| 1785 |  | 
|---|
| 1786 | rcu_read_lock(); | 
|---|
| 1787 | memcg = obj_cgroup_memcg(objcg); | 
|---|
| 1788 | count_memcg_events(memcg, idx, count); | 
|---|
| 1789 | rcu_read_unlock(); | 
|---|
| 1790 | } | 
|---|
| 1791 |  | 
|---|
| 1792 | bool mem_cgroup_node_allowed(struct mem_cgroup *memcg, int nid); | 
|---|
| 1793 |  | 
|---|
| 1794 | #else | 
|---|
| 1795 | static inline bool mem_cgroup_kmem_disabled(void) | 
|---|
| 1796 | { | 
|---|
| 1797 | return true; | 
|---|
| 1798 | } | 
|---|
| 1799 |  | 
|---|
| 1800 | static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp, | 
|---|
| 1801 | int order) | 
|---|
| 1802 | { | 
|---|
| 1803 | return 0; | 
|---|
| 1804 | } | 
|---|
| 1805 |  | 
|---|
| 1806 | static inline void memcg_kmem_uncharge_page(struct page *page, int order) | 
|---|
| 1807 | { | 
|---|
| 1808 | } | 
|---|
| 1809 |  | 
|---|
| 1810 | static inline int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, | 
|---|
| 1811 | int order) | 
|---|
| 1812 | { | 
|---|
| 1813 | return 0; | 
|---|
| 1814 | } | 
|---|
| 1815 |  | 
|---|
| 1816 | static inline void __memcg_kmem_uncharge_page(struct page *page, int order) | 
|---|
| 1817 | { | 
|---|
| 1818 | } | 
|---|
| 1819 |  | 
|---|
| 1820 | static inline struct obj_cgroup *get_obj_cgroup_from_folio(struct folio *folio) | 
|---|
| 1821 | { | 
|---|
| 1822 | return NULL; | 
|---|
| 1823 | } | 
|---|
| 1824 |  | 
|---|
| 1825 | static inline bool memcg_bpf_enabled(void) | 
|---|
| 1826 | { | 
|---|
| 1827 | return false; | 
|---|
| 1828 | } | 
|---|
| 1829 |  | 
|---|
| 1830 | static inline bool memcg_kmem_online(void) | 
|---|
| 1831 | { | 
|---|
| 1832 | return false; | 
|---|
| 1833 | } | 
|---|
| 1834 |  | 
|---|
| 1835 | static inline int memcg_kmem_id(struct mem_cgroup *memcg) | 
|---|
| 1836 | { | 
|---|
| 1837 | return -1; | 
|---|
| 1838 | } | 
|---|
| 1839 |  | 
|---|
| 1840 | static inline struct mem_cgroup *mem_cgroup_from_slab_obj(void *p) | 
|---|
| 1841 | { | 
|---|
| 1842 | return NULL; | 
|---|
| 1843 | } | 
|---|
| 1844 |  | 
|---|
| 1845 | static inline void count_objcg_events(struct obj_cgroup *objcg, | 
|---|
| 1846 | enum vm_event_item idx, | 
|---|
| 1847 | unsigned long count) | 
|---|
| 1848 | { | 
|---|
| 1849 | } | 
|---|
| 1850 |  | 
|---|
| 1851 | static inline ino_t page_cgroup_ino(struct page *page) | 
|---|
| 1852 | { | 
|---|
| 1853 | return 0; | 
|---|
| 1854 | } | 
|---|
| 1855 |  | 
|---|
| 1856 | static inline bool mem_cgroup_node_allowed(struct mem_cgroup *memcg, int nid) | 
|---|
| 1857 | { | 
|---|
| 1858 | return true; | 
|---|
| 1859 | } | 
|---|
| 1860 | #endif /* CONFIG_MEMCG */ | 
|---|
| 1861 |  | 
|---|
| 1862 | #if defined(CONFIG_MEMCG) && defined(CONFIG_ZSWAP) | 
|---|
| 1863 | bool obj_cgroup_may_zswap(struct obj_cgroup *objcg); | 
|---|
| 1864 | void obj_cgroup_charge_zswap(struct obj_cgroup *objcg, size_t size); | 
|---|
| 1865 | void obj_cgroup_uncharge_zswap(struct obj_cgroup *objcg, size_t size); | 
|---|
| 1866 | bool mem_cgroup_zswap_writeback_enabled(struct mem_cgroup *memcg); | 
|---|
| 1867 | #else | 
|---|
| 1868 | static inline bool obj_cgroup_may_zswap(struct obj_cgroup *objcg) | 
|---|
| 1869 | { | 
|---|
| 1870 | return true; | 
|---|
| 1871 | } | 
|---|
| 1872 | static inline void obj_cgroup_charge_zswap(struct obj_cgroup *objcg, | 
|---|
| 1873 | size_t size) | 
|---|
| 1874 | { | 
|---|
| 1875 | } | 
|---|
| 1876 | static inline void obj_cgroup_uncharge_zswap(struct obj_cgroup *objcg, | 
|---|
| 1877 | size_t size) | 
|---|
| 1878 | { | 
|---|
| 1879 | } | 
|---|
| 1880 | static inline bool mem_cgroup_zswap_writeback_enabled(struct mem_cgroup *memcg) | 
|---|
| 1881 | { | 
|---|
| 1882 | /* if zswap is disabled, do not block pages going to the swapping device */ | 
|---|
| 1883 | return true; | 
|---|
| 1884 | } | 
|---|
| 1885 | #endif | 
|---|
| 1886 |  | 
|---|
| 1887 |  | 
|---|
| 1888 | /* Cgroup v1-related declarations */ | 
|---|
| 1889 |  | 
|---|
| 1890 | #ifdef CONFIG_MEMCG_V1 | 
|---|
| 1891 | unsigned long memcg1_soft_limit_reclaim(pg_data_t *pgdat, int order, | 
|---|
| 1892 | gfp_t gfp_mask, | 
|---|
| 1893 | unsigned long *total_scanned); | 
|---|
| 1894 |  | 
|---|
| 1895 | bool mem_cgroup_oom_synchronize(bool wait); | 
|---|
| 1896 |  | 
|---|
| 1897 | static inline bool task_in_memcg_oom(struct task_struct *p) | 
|---|
| 1898 | { | 
|---|
| 1899 | return p->memcg_in_oom; | 
|---|
| 1900 | } | 
|---|
| 1901 |  | 
|---|
| 1902 | static inline void mem_cgroup_enter_user_fault(void) | 
|---|
| 1903 | { | 
|---|
| 1904 | WARN_ON(current->in_user_fault); | 
|---|
| 1905 | current->in_user_fault = 1; | 
|---|
| 1906 | } | 
|---|
| 1907 |  | 
|---|
| 1908 | static inline void mem_cgroup_exit_user_fault(void) | 
|---|
| 1909 | { | 
|---|
| 1910 | WARN_ON(!current->in_user_fault); | 
|---|
| 1911 | current->in_user_fault = 0; | 
|---|
| 1912 | } | 
|---|
| 1913 |  | 
|---|
| 1914 | void memcg1_swapout(struct folio *folio, swp_entry_t entry); | 
|---|
| 1915 | void memcg1_swapin(swp_entry_t entry, unsigned int nr_pages); | 
|---|
| 1916 |  | 
|---|
| 1917 | #else /* CONFIG_MEMCG_V1 */ | 
|---|
| 1918 | static inline | 
|---|
| 1919 | unsigned long memcg1_soft_limit_reclaim(pg_data_t *pgdat, int order, | 
|---|
| 1920 | gfp_t gfp_mask, | 
|---|
| 1921 | unsigned long *total_scanned) | 
|---|
| 1922 | { | 
|---|
| 1923 | return 0; | 
|---|
| 1924 | } | 
|---|
| 1925 |  | 
|---|
| 1926 | static inline bool task_in_memcg_oom(struct task_struct *p) | 
|---|
| 1927 | { | 
|---|
| 1928 | return false; | 
|---|
| 1929 | } | 
|---|
| 1930 |  | 
|---|
| 1931 | static inline bool mem_cgroup_oom_synchronize(bool wait) | 
|---|
| 1932 | { | 
|---|
| 1933 | return false; | 
|---|
| 1934 | } | 
|---|
| 1935 |  | 
|---|
| 1936 | static inline void mem_cgroup_enter_user_fault(void) | 
|---|
| 1937 | { | 
|---|
| 1938 | } | 
|---|
| 1939 |  | 
|---|
| 1940 | static inline void mem_cgroup_exit_user_fault(void) | 
|---|
| 1941 | { | 
|---|
| 1942 | } | 
|---|
| 1943 |  | 
|---|
| 1944 | static inline void memcg1_swapout(struct folio *folio, swp_entry_t entry) | 
|---|
| 1945 | { | 
|---|
| 1946 | } | 
|---|
| 1947 |  | 
|---|
| 1948 | static inline void memcg1_swapin(swp_entry_t entry, unsigned int nr_pages) | 
|---|
| 1949 | { | 
|---|
| 1950 | } | 
|---|
| 1951 |  | 
|---|
| 1952 | #endif /* CONFIG_MEMCG_V1 */ | 
|---|
| 1953 |  | 
|---|
| 1954 | #endif /* _LINUX_MEMCONTROL_H */ | 
|---|
| 1955 |  | 
|---|