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Commit 72b54e73 authored by Vladimir Davydov's avatar Vladimir Davydov Committed by Linus Torvalds
Browse files

mm: memcontrol: make tree_{stat,events} fetch all stats 



Currently, tree_{stat,events} helpers can only get one stat index at a
time, so when there are a lot of stats to be reported one has to call it
over and over again (see memory_stat_show).  This is neither effective,
nor does it look good.  Instead, let's make these helpers take a
snapshot of all available counters.

Signed-off-by: default avatarVladimir Davydov <vdavydov@virtuozzo.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fcff7d7e

mm/memcontrol.c

+39 −28
Original line number Diff line number Diff line
@@ -2717,39 +2717,48 @@ static int mem_cgroup_hierarchy_write(struct cgroup_subsys_state *css, 
	return retval;

}



static unsigned long tree_stat(struct mem_cgroup *memcg,

			       enum mem_cgroup_stat_index idx)

static void tree_stat(struct mem_cgroup *memcg, unsigned long *stat)

{

	struct mem_cgroup *iter;

	unsigned long val = 0;

	int i;



	for_each_mem_cgroup_tree(iter, memcg)

		val += mem_cgroup_read_stat(iter, idx);

	memset(stat, 0, sizeof(*stat) * MEMCG_NR_STAT);



	return val;

	for_each_mem_cgroup_tree(iter, memcg) {

		for (i = 0; i < MEMCG_NR_STAT; i++)

			stat[i] += mem_cgroup_read_stat(iter, i);

	}

}



static unsigned long tree_events(struct mem_cgroup *memcg,

				 enum mem_cgroup_events_index idx)

static void tree_events(struct mem_cgroup *memcg, unsigned long *events)

{

	struct mem_cgroup *iter;

	unsigned long val = 0;

	int i;



	for_each_mem_cgroup_tree(iter, memcg)

		val += mem_cgroup_read_events(iter, idx);

	memset(events, 0, sizeof(*events) * MEMCG_NR_EVENTS);



	return val;

	for_each_mem_cgroup_tree(iter, memcg) {

		for (i = 0; i < MEMCG_NR_EVENTS; i++)

			events[i] += mem_cgroup_read_events(iter, i);

	}

}



static unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap)

{

	unsigned long val;

	unsigned long val = 0;



	if (mem_cgroup_is_root(memcg)) {

		val = tree_stat(memcg, MEM_CGROUP_STAT_CACHE);

		val += tree_stat(memcg, MEM_CGROUP_STAT_RSS);

		struct mem_cgroup *iter;



		for_each_mem_cgroup_tree(iter, memcg) {

			val += mem_cgroup_read_stat(iter,

					MEM_CGROUP_STAT_CACHE);

			val += mem_cgroup_read_stat(iter,

					MEM_CGROUP_STAT_RSS);

			if (swap)

			val += tree_stat(memcg, MEM_CGROUP_STAT_SWAP);

				val += mem_cgroup_read_stat(iter,

						MEM_CGROUP_STAT_SWAP);

		}

	} else {

		if (!swap)

			val = page_counter_read(&memcg->memory);
@@ -5075,6 +5084,8 @@ static int memory_events_show(struct seq_file *m, void *v) 
static int memory_stat_show(struct seq_file *m, void *v)

{

	struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));

	unsigned long stat[MEMCG_NR_STAT];

	unsigned long events[MEMCG_NR_EVENTS];

	int i;



	/*
@@ -5088,22 +5099,22 @@ static int memory_stat_show(struct seq_file *m, void *v) 
	 * Current memory state:

	 */



	tree_stat(memcg, stat);

	tree_events(memcg, events);



	seq_printf(m, "anon %llu\n",

		   (u64)tree_stat(memcg, MEM_CGROUP_STAT_RSS) * PAGE_SIZE);

		   (u64)stat[MEM_CGROUP_STAT_RSS] * PAGE_SIZE);

	seq_printf(m, "file %llu\n",

		   (u64)tree_stat(memcg, MEM_CGROUP_STAT_CACHE) * PAGE_SIZE);

		   (u64)stat[MEM_CGROUP_STAT_CACHE] * PAGE_SIZE);

	seq_printf(m, "sock %llu\n",

		   (u64)tree_stat(memcg, MEMCG_SOCK) * PAGE_SIZE);

		   (u64)stat[MEMCG_SOCK] * PAGE_SIZE);



	seq_printf(m, "file_mapped %llu\n",

		   (u64)tree_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED) *

		   PAGE_SIZE);

		   (u64)stat[MEM_CGROUP_STAT_FILE_MAPPED] * PAGE_SIZE);

	seq_printf(m, "file_dirty %llu\n",

		   (u64)tree_stat(memcg, MEM_CGROUP_STAT_DIRTY) *

		   PAGE_SIZE);

		   (u64)stat[MEM_CGROUP_STAT_DIRTY] * PAGE_SIZE);

	seq_printf(m, "file_writeback %llu\n",

		   (u64)tree_stat(memcg, MEM_CGROUP_STAT_WRITEBACK) *

		   PAGE_SIZE);

		   (u64)stat[MEM_CGROUP_STAT_WRITEBACK] * PAGE_SIZE);



	for (i = 0; i < NR_LRU_LISTS; i++) {

		struct mem_cgroup *mi;
@@ -5118,9 +5129,9 @@ static int memory_stat_show(struct seq_file *m, void *v) 
	/* Accumulated memory events */



	seq_printf(m, "pgfault %lu\n",

		   tree_events(memcg, MEM_CGROUP_EVENTS_PGFAULT));

		   events[MEM_CGROUP_EVENTS_PGFAULT]);

	seq_printf(m, "pgmajfault %lu\n",

		   tree_events(memcg, MEM_CGROUP_EVENTS_PGMAJFAULT));

		   events[MEM_CGROUP_EVENTS_PGMAJFAULT]);



	return 0;

}