sl[au]b: allocate objects from memcg cache

We are able to match a cache allocation to a particular memcg.  If the
task doesn't change groups during the allocation itself - a rare event,
this will give us a good picture about who is the first group to touch a
cache page.

This patch uses the now available infrastructure by calling
memcg_kmem_get_cache() before all the cache allocations.

Signed-off-by: Glauber Costa <glommer@parallels.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Frederic Weisbecker <fweisbec@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: JoonSoo Kim <js1304@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Rik van Riel <riel@redhat.com>
Cc: Suleiman Souhlal <suleiman@google.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 16 insertions, 5 deletions

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 961e72eab907..364ba6c9fe21 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -225,7 +225,10 @@ void *__kmalloc(size_t size, gfp_t flags);
 static __always_inline void *
 kmalloc_order(size_t size, gfp_t flags, unsigned int order)
 {
-        void *ret = (void *) __get_free_pages(flags | __GFP_COMP, order);
+        void *ret;
+
+        flags |= (__GFP_COMP | __GFP_KMEMCG);
+        ret = (void *) __get_free_pages(flags, order);
         kmemleak_alloc(ret, size, 1, flags);
         return ret;
 }
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 65302a083d2f..cc13797d0fbc 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3086,6 +3086,9 @@ static struct kmem_cache *kmem_cache_dup(struct mem_cgroup *memcg,
         new = kmem_cache_create_memcg(memcg, name, s->object_size, s->align,
                                       (s->flags & ~SLAB_PANIC), s->ctor);
 
+        if (new)
+                new->allocflags |= __GFP_KMEMCG;
+
         kfree(name);
         return new;
 }
diff --git a/mm/slab.c b/mm/slab.c
index bab6fec765a7..e265865e8700 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1933,7 +1933,7 @@ static void kmem_freepages(struct kmem_cache *cachep, void *addr)
         }
         if (current->reclaim_state)
                 current->reclaim_state->reclaimed_slab += nr_freed;
-        free_pages((unsigned long)addr, cachep->gfporder);
+        free_memcg_kmem_pages((unsigned long)addr, cachep->gfporder);
 }
 
 static void kmem_rcu_free(struct rcu_head *head)
@@ -3486,6 +3486,8 @@ slab_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid,
         if (slab_should_failslab(cachep, flags))
                 return NULL;
 
+        cachep = memcg_kmem_get_cache(cachep, flags);
+
         cache_alloc_debugcheck_before(cachep, flags);
         local_irq_save(save_flags);
 
@@ -3571,6 +3573,8 @@ slab_alloc(struct kmem_cache *cachep, gfp_t flags, unsigned long caller)
         if (slab_should_failslab(cachep, flags))
                 return NULL;
 
+        cachep = memcg_kmem_get_cache(cachep, flags);
+
         cache_alloc_debugcheck_before(cachep, flags);
         local_irq_save(save_flags);
         objp = __do_cache_alloc(cachep, flags);
diff --git a/mm/slub.c b/mm/slub.c
index 6d5f2305d7a4..ef39e872b8eb 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1405,7 +1405,7 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
         reset_page_mapcount(page);
         if (current->reclaim_state)
                 current->reclaim_state->reclaimed_slab += pages;
-        __free_pages(page, order);
+        __free_memcg_kmem_pages(page, order);
 }
 
 #define need_reserve_slab_rcu                                           \
@@ -2323,6 +2323,7 @@ static __always_inline void *slab_alloc_node(struct kmem_cache *s,
         if (slab_pre_alloc_hook(s, gfpflags))
                 return NULL;
 
+        s = memcg_kmem_get_cache(s, gfpflags);
 redo:
 
         /*
@@ -3284,7 +3285,7 @@ static void *kmalloc_large_node(size_t size, gfp_t flags, int node)
         struct page *page;
         void *ptr = NULL;
 
-        flags |= __GFP_COMP | __GFP_NOTRACK;
+        flags |= __GFP_COMP | __GFP_NOTRACK | __GFP_KMEMCG;
         page = alloc_pages_node(node, flags, get_order(size));
         if (page)
                 ptr = page_address(page);
@@ -3390,7 +3391,7 @@ void kfree(const void *x)
         if (unlikely(!PageSlab(page))) {
                 BUG_ON(!PageCompound(page));
                 kmemleak_free(x);
-                __free_pages(page, compound_order(page));
+                __free_memcg_kmem_pages(page, compound_order(page));
                 return;
         }
         slab_free(page->slab_cache, page, object, _RET_IP_);