From cb731d6c62bbc2f890b08ea3d0386d5dad887326 Mon Sep 17 00:00:00 2001 From: Vladimir Davydov Date: Thu, 12 Feb 2015 14:58:54 -0800 Subject: vmscan: per memory cgroup slab shrinkers This patch adds SHRINKER_MEMCG_AWARE flag. If a shrinker has this flag set, it will be called per memory cgroup. The memory cgroup to scan objects from is passed in shrink_control->memcg. If the memory cgroup is NULL, a memcg aware shrinker is supposed to scan objects from the global list. Unaware shrinkers are only called on global pressure with memcg=NULL. Signed-off-by: Vladimir Davydov Cc: Dave Chinner Cc: Johannes Weiner Cc: Michal Hocko Cc: Greg Thelen Cc: Glauber Costa Cc: Alexander Viro Cc: Christoph Lameter Cc: Pekka Enberg Cc: David Rientjes Cc: Joonsoo Kim Cc: Tejun Heo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/shrinker.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'include/linux/shrinker.h') diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h index f4aee75f00b1..4fcacd915d45 100644 --- a/include/linux/shrinker.h +++ b/include/linux/shrinker.h @@ -20,6 +20,9 @@ struct shrink_control { /* current node being shrunk (for NUMA aware shrinkers) */ int nid; + + /* current memcg being shrunk (for memcg aware shrinkers) */ + struct mem_cgroup *memcg; }; #define SHRINK_STOP (~0UL) @@ -61,7 +64,8 @@ struct shrinker { #define DEFAULT_SEEKS 2 /* A good number if you don't know better. */ /* Flags */ -#define SHRINKER_NUMA_AWARE (1 << 0) +#define SHRINKER_NUMA_AWARE (1 << 0) +#define SHRINKER_MEMCG_AWARE (1 << 1) extern int register_shrinker(struct shrinker *); extern void unregister_shrinker(struct shrinker *); -- cgit