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Commit 749c5415 authored by Glauber Costa's avatar Glauber Costa Committed by Linus Torvalds
Browse files

memcg: aggregate memcg cache values in slabinfo 



When we create caches in memcgs, we need to display their usage
information somewhere.  We'll adopt a scheme similar to /proc/meminfo,
with aggregate totals shown in the global file, and per-group information
stored in the group itself.

For the time being, only reads are allowed in the per-group cache.

Signed-off-by: default avatarGlauber 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 22933152

include/linux/memcontrol.h

+8 −0
Original line number Diff line number Diff line
@@ -420,6 +420,11 @@ static inline void sock_release_memcg(struct sock *sk) 


#ifdef CONFIG_MEMCG_KMEM

extern struct static_key memcg_kmem_enabled_key;



extern int memcg_limited_groups_array_size;

#define for_each_memcg_cache_index(_idx)	\

	for ((_idx) = 0; i < memcg_limited_groups_array_size; (_idx)++)



static inline bool memcg_kmem_enabled(void)

{

	return static_key_false(&memcg_kmem_enabled_key);
@@ -557,6 +562,9 @@ memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp) 
	return __memcg_kmem_get_cache(cachep, gfp);

}

#else

#define for_each_memcg_cache_index(_idx)	\

	for (; NULL; )



static inline bool memcg_kmem_enabled(void)

{

	return false;

include/linux/slab.h

+4 −0
Original line number Diff line number Diff line
@@ -220,6 +220,10 @@ struct memcg_cache_params { 


int memcg_update_all_caches(int num_memcgs);



struct seq_file;

int cache_show(struct kmem_cache *s, struct seq_file *m);

void print_slabinfo_header(struct seq_file *m);



/*

 * Common kmalloc functions provided by all allocators

 */

mm/memcontrol.c

+29 −1
Original line number Diff line number Diff line
@@ -572,7 +572,8 @@ static void disarm_sock_keys(struct mem_cgroup *memcg) 
 * increase it.

 */

static DEFINE_IDA(kmem_limited_groups);

static int memcg_limited_groups_array_size;

int memcg_limited_groups_array_size;



/*

 * MIN_SIZE is different than 1, because we would like to avoid going through

 * the alloc/free process all the time. In a small machine, 4 kmem-limited
@@ -2794,6 +2795,27 @@ static struct kmem_cache *memcg_params_to_cache(struct memcg_cache_params *p) 
	return cachep->memcg_params->memcg_caches[memcg_cache_id(p->memcg)];

}



#ifdef CONFIG_SLABINFO

static int mem_cgroup_slabinfo_read(struct cgroup *cont, struct cftype *cft,

					struct seq_file *m)

{

	struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);

	struct memcg_cache_params *params;



	if (!memcg_can_account_kmem(memcg))

		return -EIO;



	print_slabinfo_header(m);



	mutex_lock(&memcg->slab_caches_mutex);

	list_for_each_entry(params, &memcg->memcg_slab_caches, list)

		cache_show(memcg_params_to_cache(params), m);

	mutex_unlock(&memcg->slab_caches_mutex);



	return 0;

}

#endif



static int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp, u64 size)

{

	struct res_counter *fail_res;
@@ -5822,6 +5844,12 @@ static struct cftype mem_cgroup_files[] = { 
		.trigger = mem_cgroup_reset,

		.read = mem_cgroup_read,

	},

#ifdef CONFIG_SLABINFO

	{

		.name = "kmem.slabinfo",

		.read_seq_string = mem_cgroup_slabinfo_read,

	},

#endif

#endif

	{ },	/* terminate */

};

mm/slab.h

+27 −0
Original line number Diff line number Diff line
@@ -138,6 +138,23 @@ static inline bool slab_equal_or_root(struct kmem_cache *s, 
	return (p == s) ||

		(s->memcg_params && (p == s->memcg_params->root_cache));

}



/*

 * We use suffixes to the name in memcg because we can't have caches

 * created in the system with the same name. But when we print them

 * locally, better refer to them with the base name

 */

static inline const char *cache_name(struct kmem_cache *s)

{

	if (!is_root_cache(s))

		return s->memcg_params->root_cache->name;

	return s->name;

}



static inline struct kmem_cache *cache_from_memcg(struct kmem_cache *s, int idx)

{

	return s->memcg_params->memcg_caches[idx];

}

#else

static inline bool is_root_cache(struct kmem_cache *s)

{
@@ -163,6 +180,16 @@ static inline bool slab_equal_or_root(struct kmem_cache *s, 
{

	return true;

}



static inline const char *cache_name(struct kmem_cache *s)

{

	return s->name;

}



static inline struct kmem_cache *cache_from_memcg(struct kmem_cache *s, int idx)

{

	return NULL;

}

#endif



static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)

mm/slab_common.c

+40 −4
Original line number Diff line number Diff line
@@ -322,7 +322,7 @@ struct kmem_cache *__init create_kmalloc_cache(const char *name, size_t size, 




#ifdef CONFIG_SLABINFO

static void print_slabinfo_header(struct seq_file *m)

void print_slabinfo_header(struct seq_file *m)

{

	/*

	 * Output format version, so at least we can change it
@@ -366,16 +366,43 @@ static void s_stop(struct seq_file *m, void *p) 
	mutex_unlock(&slab_mutex);

}



static int s_show(struct seq_file *m, void *p)

static void

memcg_accumulate_slabinfo(struct kmem_cache *s, struct slabinfo *info)

{

	struct kmem_cache *c;

	struct slabinfo sinfo;

	int i;



	if (!is_root_cache(s))

		return;



	for_each_memcg_cache_index(i) {

		c = cache_from_memcg(s, i);

		if (!c)

			continue;



		memset(&sinfo, 0, sizeof(sinfo));

		get_slabinfo(c, &sinfo);



		info->active_slabs += sinfo.active_slabs;

		info->num_slabs += sinfo.num_slabs;

		info->shared_avail += sinfo.shared_avail;

		info->active_objs += sinfo.active_objs;

		info->num_objs += sinfo.num_objs;

	}

}



int cache_show(struct kmem_cache *s, struct seq_file *m)

{

	struct kmem_cache *s = list_entry(p, struct kmem_cache, list);

	struct slabinfo sinfo;



	memset(&sinfo, 0, sizeof(sinfo));

	get_slabinfo(s, &sinfo);



	memcg_accumulate_slabinfo(s, &sinfo);



	seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d",

		   s->name, sinfo.active_objs, sinfo.num_objs, s->size,

		   cache_name(s), sinfo.active_objs, sinfo.num_objs, s->size,

		   sinfo.objects_per_slab, (1 << sinfo.cache_order));



	seq_printf(m, " : tunables %4u %4u %4u",
@@ -387,6 +414,15 @@ static int s_show(struct seq_file *m, void *p) 
	return 0;

}



static int s_show(struct seq_file *m, void *p)

{

	struct kmem_cache *s = list_entry(p, struct kmem_cache, list);



	if (!is_root_cache(s))

		return 0;

	return cache_show(s, m);

}



/*

 * slabinfo_op - iterator that generates /proc/slabinfo

 *