From b382ffa5847eda0f542111e8f059537dffc24525 Mon Sep 17 00:00:00 2001 From: Yang Shi Date: Tue, 22 Oct 2019 01:40:15 +0800 Subject: [PATCH] mm: shrinker: make shrinker not depend on memcg kmem commit 0a432dcbeb32edcd211a5d8f7847d0da7642a8b4 upstream Currently shrinker is just allocated and can work when memcg kmem is enabled. But, THP deferred split shrinker is not slab shrinker, it doesn't make too much sense to have such shrinker depend on memcg kmem. It should be able to reclaim THP even though memcg kmem is disabled. Introduce a new shrinker flag, SHRINKER_NONSLAB, for non-slab shrinker. When memcg kmem is disabled, just such shrinkers can be called in shrinking memcg slab. [yang.shi@linux.alibaba.com: add comment] Link: http://lkml.kernel.org/r/1566496227-84952-4-git-send-email-yang.shi@linux.alibaba.com Link: http://lkml.kernel.org/r/1565144277-36240-4-git-send-email-yang.shi@linux.alibaba.com Signed-off-by: Yang Shi Acked-by: Kirill A. Shutemov Reviewed-by: Kirill Tkhai Cc: Johannes Weiner Cc: Michal Hocko Cc: "Kirill A . Shutemov" Cc: Hugh Dickins Cc: Shakeel Butt Cc: David Rientjes Cc: Qian Cai Cc: Vladimir Davydov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Reviewed-by: Xunlei Pang --- include/linux/memcontrol.h | 19 +++++++++++-------- include/linux/shrinker.h | 7 ++++++- mm/memcontrol.c | 9 +-------- mm/vmscan.c | 36 +++++++++++++++++++----------------- 4 files changed, 37 insertions(+), 34 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index dfa3a89a1440..c7709d677b24 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -134,9 +134,8 @@ struct mem_cgroup_per_node { struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1]; -#ifdef CONFIG_MEMCG_KMEM struct memcg_shrinker_map __rcu *shrinker_map; -#endif + struct rb_node tree_node; /* RB tree node */ unsigned long usage_in_excess;/* Set to the value by which */ /* the soft limit is exceeded*/ @@ -1307,6 +1306,11 @@ static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) } while ((memcg = parent_mem_cgroup(memcg))); return false; } + +extern int memcg_expand_shrinker_maps(int new_id); + +extern void memcg_set_shrinker_bit(struct mem_cgroup *memcg, + int nid, int shrinker_id); #else #define mem_cgroup_sockets_enabled 0 static inline void mem_cgroup_sk_alloc(struct sock *sk) { }; @@ -1315,6 +1319,11 @@ static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) { return false; } + +static inline void memcg_set_shrinker_bit(struct mem_cgroup *memcg, + int nid, int shrinker_id) +{ +} #endif struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep); @@ -1355,10 +1364,6 @@ static inline int memcg_cache_id(struct mem_cgroup *memcg) return memcg ? memcg->kmemcg_id : -1; } -extern int memcg_expand_shrinker_maps(int new_id); - -extern void memcg_set_shrinker_bit(struct mem_cgroup *memcg, - int nid, int shrinker_id); #else #define for_each_memcg_cache_index(_idx) \ for (; NULL; ) @@ -1381,8 +1386,6 @@ static inline void memcg_put_cache_ids(void) { } -static inline void memcg_set_shrinker_bit(struct mem_cgroup *memcg, - int nid, int shrinker_id) { } #endif /* CONFIG_MEMCG_KMEM */ #endif /* _LINUX_MEMCONTROL_H */ diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h index 9443cafd1969..0f80123650e2 100644 --- a/include/linux/shrinker.h +++ b/include/linux/shrinker.h @@ -69,7 +69,7 @@ struct shrinker { /* These are for internal use */ struct list_head list; -#ifdef CONFIG_MEMCG_KMEM +#ifdef CONFIG_MEMCG /* ID in shrinker_idr */ int id; #endif @@ -81,6 +81,11 @@ struct shrinker { /* Flags */ #define SHRINKER_NUMA_AWARE (1 << 0) #define SHRINKER_MEMCG_AWARE (1 << 1) +/* + * It just makes sense when the shrinker is also MEMCG_AWARE for now, + * non-MEMCG_AWARE shrinker should not have this flag set. + */ +#define SHRINKER_NONSLAB (1 << 2) extern int prealloc_shrinker(struct shrinker *shrinker); extern void register_shrinker_prepared(struct shrinker *shrinker); diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 31abc4dc1c54..5c510b520887 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -323,6 +323,7 @@ DEFINE_STATIC_KEY_FALSE(memcg_kmem_enabled_key); EXPORT_SYMBOL(memcg_kmem_enabled_key); struct workqueue_struct *memcg_kmem_cache_wq; +#endif static int memcg_shrinker_map_size; static DEFINE_MUTEX(memcg_shrinker_map_mutex); @@ -446,14 +447,6 @@ void memcg_set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id) } } -#else /* CONFIG_MEMCG_KMEM */ -static int memcg_alloc_shrinker_maps(struct mem_cgroup *memcg) -{ - return 0; -} -static void memcg_free_shrinker_maps(struct mem_cgroup *memcg) { } -#endif /* CONFIG_MEMCG_KMEM */ - /** * mem_cgroup_css_from_page - css of the memcg associated with a page * @page: page of interest diff --git a/mm/vmscan.c b/mm/vmscan.c index 5cb60c830d76..df078b2529cd 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -170,8 +170,7 @@ unsigned long vm_total_pages; static LIST_HEAD(shrinker_list); static DECLARE_RWSEM(shrinker_rwsem); -#ifdef CONFIG_MEMCG_KMEM - +#ifdef CONFIG_MEMCG /* * We allow subsystems to populate their shrinker-related * LRU lists before register_shrinker_prepared() is called @@ -223,18 +222,7 @@ static void unregister_memcg_shrinker(struct shrinker *shrinker) idr_remove(&shrinker_idr, id); up_write(&shrinker_rwsem); } -#else /* CONFIG_MEMCG_KMEM */ -static int prealloc_memcg_shrinker(struct shrinker *shrinker) -{ - return 0; -} -static void unregister_memcg_shrinker(struct shrinker *shrinker) -{ -} -#endif /* CONFIG_MEMCG_KMEM */ - -#ifdef CONFIG_MEMCG static bool global_reclaim(struct scan_control *sc) { return !sc->target_mem_cgroup; @@ -334,6 +322,15 @@ static bool memcg_writeback(pg_data_t *pgdat, return READ_ONCE(mn->writeback); } #else +static int prealloc_memcg_shrinker(struct shrinker *shrinker) +{ + return 0; +} + +static void unregister_memcg_shrinker(struct shrinker *shrinker) +{ +} + static bool global_reclaim(struct scan_control *sc) { return true; @@ -632,7 +629,7 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl, return freed; } -#ifdef CONFIG_MEMCG_KMEM +#ifdef CONFIG_MEMCG static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid, struct mem_cgroup *memcg, int priority) { @@ -640,7 +637,7 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid, unsigned long ret, freed = 0; int i; - if (!memcg_kmem_enabled() || !mem_cgroup_online(memcg)) + if (!mem_cgroup_online(memcg)) return 0; if (!down_read_trylock(&shrinker_rwsem)) @@ -666,6 +663,11 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid, continue; } + /* Call non-slab shrinkers even though kmem is disabled */ + if (!memcg_kmem_enabled() && + !(shrinker->flags & SHRINKER_NONSLAB)) + continue; + ret = do_shrink_slab(&sc, shrinker, priority); if (ret == SHRINK_EMPTY) { clear_bit(i, map->map); @@ -702,13 +704,13 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid, up_read(&shrinker_rwsem); return freed; } -#else /* CONFIG_MEMCG_KMEM */ +#else /* CONFIG_MEMCG */ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid, struct mem_cgroup *memcg, int priority) { return 0; } -#endif /* CONFIG_MEMCG_KMEM */ +#endif /* CONFIG_MEMCG */ /** * shrink_slab - shrink slab caches -- GitLab