From b6ac57d50a375aa2f267e1b2b56c46564a936d00 Mon Sep 17 00:00:00 2001 From: Balbir Singh Date: Tue, 29 Apr 2008 01:00:19 -0700 Subject: [PATCH] memcgroup: move memory controller allocations to their own slabs Move the memory controller data structure page_cgroup to its own slab cache. It saves space on the system, allocations are not necessarily pushed to order of 2 and should provide performance benefits. Users who disable the memory controller can also double check that the memory controller is not allocating page_cgroup's. NOTE: Hugh Dickins brought up the issue of whether we want to mark page_cgroup as __GFP_MOVABLE or __GFP_RECLAIMABLE. I don't think there is an easy answer at the moment. page_cgroup's are associated with user pages, they can be reclaimed once the user page has been reclaimed, so it might make sense to mark them as __GFP_RECLAIMABLE. For now, I am leaving the marking to default values that the slab allocator uses. Signed-off-by: Balbir Singh Cc: Pavel Emelianov Cc: Hugh Dickins Cc: Sudhir Kumar Cc: YAMAMOTO Takashi Cc: Paul Menage Cc: David Rientjes Cc: KAMEZAWA Hiroyuki Cc: Mel Gorman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memcontrol.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 350a14da6525..f4079692cbf5 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include #include @@ -35,6 +36,7 @@ struct cgroup_subsys mem_cgroup_subsys; static const int MEM_CGROUP_RECLAIM_RETRIES = 5; +static struct kmem_cache *page_cgroup_cache; /* * Statistics for memory cgroup. @@ -547,7 +549,7 @@ retry: } unlock_page_cgroup(page); - pc = kzalloc(sizeof(struct page_cgroup), gfp_mask); + pc = kmem_cache_zalloc(page_cgroup_cache, gfp_mask); if (pc == NULL) goto err; @@ -609,7 +611,7 @@ retry: */ res_counter_uncharge(&mem->res, PAGE_SIZE); css_put(&mem->css); - kfree(pc); + kmem_cache_free(page_cgroup_cache, pc); goto retry; } page_assign_page_cgroup(page, pc); @@ -624,7 +626,7 @@ done: return 0; out: css_put(&mem->css); - kfree(pc); + kmem_cache_free(page_cgroup_cache, pc); err: return -ENOMEM; } @@ -682,7 +684,7 @@ void mem_cgroup_uncharge_page(struct page *page) res_counter_uncharge(&mem->res, PAGE_SIZE); css_put(&mem->css); - kfree(pc); + kmem_cache_free(page_cgroup_cache, pc); return; } @@ -989,10 +991,12 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont) struct mem_cgroup *mem; int node; - if (unlikely((cont->parent) == NULL)) + if (unlikely((cont->parent) == NULL)) { mem = &init_mem_cgroup; - else + page_cgroup_cache = KMEM_CACHE(page_cgroup, SLAB_PANIC); + } else { mem = kzalloc(sizeof(struct mem_cgroup), GFP_KERNEL); + } if (mem == NULL) return ERR_PTR(-ENOMEM); -- 2.39.2