diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/vmpressure.h | 46 |
1 files changed, 41 insertions, 5 deletions
diff --git a/include/linux/vmpressure.h b/include/linux/vmpressure.h index faecd5522401..b4d13457bc2a 100644 --- a/include/linux/vmpressure.h +++ b/include/linux/vmpressure.h @@ -13,18 +13,31 @@ struct vmpressure { unsigned long scanned; unsigned long reclaimed; + /* The lock is used to keep the scanned/reclaimed in sync. */ + spinlock_t sr_lock; +#ifdef CONFIG_MEMCG_V1 + /* + * tree=true accumulators feed the v1 userspace eventfd interface + * (memory.pressure_level). Drained by @work. v2 has no equivalent + * interface, so this state is omitted on CONFIG_MEMCG_V1=n builds. + */ unsigned long tree_scanned; unsigned long tree_reclaimed; - /* The lock is used to keep the scanned/reclaimed above in sync. */ - spinlock_t sr_lock; - /* The list of vmpressure_event structs. */ struct list_head events; /* Have to grab the lock on events traversal or modifications. */ struct mutex events_lock; struct work_struct work; +#endif +}; + +enum vmpressure_levels { + VMPRESSURE_LOW = 0, + VMPRESSURE_MEDIUM, + VMPRESSURE_CRITICAL, + VMPRESSURE_NUM_LEVELS, }; struct mem_cgroup; @@ -32,18 +45,41 @@ struct mem_cgroup; #ifdef CONFIG_MEMCG void vmpressure(gfp_t gfp, int order, struct mem_cgroup *memcg, bool tree, unsigned long scanned, unsigned long reclaimed); -extern void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, int prio); - extern void vmpressure_init(struct vmpressure *vmpr); extern void vmpressure_cleanup(struct vmpressure *vmpr); extern struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg); extern struct mem_cgroup *vmpressure_to_memcg(struct vmpressure *vmpr); + +/* Shared with the v1 vmpressure block in mm/memcontrol-v1.c. */ +extern const unsigned long vmpressure_win; +extern enum vmpressure_levels vmpressure_calc_level(unsigned long scanned, + unsigned long reclaimed); + +#ifdef CONFIG_MEMCG_V1 +extern void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, int prio); extern int vmpressure_register_event(struct mem_cgroup *memcg, struct eventfd_ctx *eventfd, const char *args); extern void vmpressure_unregister_event(struct mem_cgroup *memcg, struct eventfd_ctx *eventfd); + +/* v1 hooks called from mm/vmpressure.c; no-ops below when !MEMCG_V1. */ +extern void vmpressure_v1_init(struct vmpressure *vmpr); +extern void vmpressure_v1_cleanup(struct vmpressure *vmpr); +extern void vmpressure_v1_account_tree(struct vmpressure *vmpr, + unsigned long scanned, + unsigned long reclaimed); #else +static inline void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, + int prio) {} +static inline void vmpressure_v1_init(struct vmpressure *vmpr) {} +static inline void vmpressure_v1_cleanup(struct vmpressure *vmpr) {} +static inline void vmpressure_v1_account_tree(struct vmpressure *vmpr, + unsigned long scanned, + unsigned long reclaimed) {} +#endif /* CONFIG_MEMCG_V1 */ + +#else /* !CONFIG_MEMCG */ static inline void vmpressure(gfp_t gfp, int order, struct mem_cgroup *memcg, bool tree, unsigned long scanned, unsigned long reclaimed) {} |