summaryrefslogtreecommitdiff
path: root/include/linux/slab.h
diff options
context:
space:
mode:
authorGlauber Costa <glommer@parallels.com>2012-12-18 14:22:27 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-18 15:02:13 -0800
commitba6c496ed834a37a26fc6fc87fc9aecb0fa0014d (patch)
treecd229b78ca04817354865c9fdf57b564a6bf7852 /include/linux/slab.h
parentd5bdae7d59451b9d63303f7794ef32bb76ba6330 (diff)
slab/slub: struct memcg_params
For the kmem slab controller, we need to record some extra information in the kmem_cache structure. Signed-off-by: Glauber Costa <glommer@parallels.com> Signed-off-by: Suleiman Souhlal <suleiman@google.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: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/slab.h')
-rw-r--r--include/linux/slab.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 743a10415122..00efba149222 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -177,6 +177,30 @@ void kmem_cache_free(struct kmem_cache *, void *);
#endif
/*
+ * This is the main placeholder for memcg-related information in kmem caches.
+ * struct kmem_cache will hold a pointer to it, so the memory cost while
+ * disabled is 1 pointer. The runtime cost while enabled, gets bigger than it
+ * would otherwise be if that would be bundled in kmem_cache: we'll need an
+ * extra pointer chase. But the trade off clearly lays in favor of not
+ * penalizing non-users.
+ *
+ * Both the root cache and the child caches will have it. For the root cache,
+ * this will hold a dynamically allocated array large enough to hold
+ * information about the currently limited memcgs in the system.
+ *
+ * Child caches will hold extra metadata needed for its operation. Fields are:
+ *
+ * @memcg: pointer to the memcg this cache belongs to
+ */
+struct memcg_cache_params {
+ bool is_root_cache;
+ union {
+ struct kmem_cache *memcg_caches[0];
+ struct mem_cgroup *memcg;
+ };
+};
+
+/*
* Common kmalloc functions provided by all allocators
*/
void * __must_check __krealloc(const void *, size_t, gfp_t);