Provide a cgroup2 memory.stat that provides statistics on LRU memory
and fault event counters. More consumers and breakdowns will follow.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
mm/memcontrol.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 57 insertions(+)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c26ffac..8645852 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2767,6 +2767,18 @@ static unsigned long tree_stat(struct mem_cgroup *memcg,
return val;
}
+static unsigned long tree_events(struct mem_cgroup *memcg,
+ enum mem_cgroup_events_index idx)
+{
+ struct mem_cgroup *iter;
+ unsigned long val = 0;
+
+ for_each_mem_cgroup_tree(iter, memcg)
+ val += mem_cgroup_read_events(iter, idx);
+
+ return val;
+}
+
static unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap)
{
unsigned long val;
@@ -5095,6 +5107,46 @@ static int memory_events_show(struct seq_file *m, void *v)
return 0;
}
+static int memory_stat_show(struct seq_file *m, void *v)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+ int i;
+
+ /* Memory consumer totals */
+
+ seq_printf(m, "anon %lu\n",
+ tree_stat(memcg, MEM_CGROUP_STAT_RSS) * PAGE_SIZE);
+ seq_printf(m, "file %lu\n",
+ tree_stat(memcg, MEM_CGROUP_STAT_CACHE) * PAGE_SIZE);
+
+ /* Per-consumer breakdowns */
+
+ for (i = 0; i < NR_LRU_LISTS; i++) {
+ struct mem_cgroup *mi;
+ unsigned long val = 0;
+
+ for_each_mem_cgroup_tree(mi, memcg)
+ val += mem_cgroup_nr_lru_pages(mi, BIT(i)) * PAGE_SIZE;
+ seq_printf(m, "%s %lu\n", mem_cgroup_lru_names[i], val);
+ }
+
+ seq_printf(m, "file_mapped %lu\n",
+ tree_stat(memcg, MEM_CGROUP_STAT_FILE_MAPPED) * PAGE_SIZE);
+ seq_printf(m, "file_dirty %lu\n",
+ tree_stat(memcg, MEM_CGROUP_STAT_DIRTY) * PAGE_SIZE);
+ seq_printf(m, "file_writeback %lu\n",
+ tree_stat(memcg, MEM_CGROUP_STAT_WRITEBACK) * PAGE_SIZE);
+
+ /* Memory management events */
+
+ seq_printf(m, "pgfault %lu\n",
+ tree_events(memcg, MEM_CGROUP_EVENTS_PGFAULT));
+ seq_printf(m, "pgmajfault %lu\n",
+ tree_events(memcg, MEM_CGROUP_EVENTS_PGMAJFAULT));
+
+ return 0;
+}
+
static struct cftype memory_files[] = {
{
.name = "current",
@@ -5125,6 +5177,11 @@ static struct cftype memory_files[] = {
.file_offset = offsetof(struct mem_cgroup, events_file),
.seq_show = memory_events_show,
},
+ {
+ .name = "stat",
+ .flags = CFTYPE_NOT_ON_ROOT,
+ .seq_show = memory_stat_show,
+ },
{ } /* terminate */
};
--
2.7.0
--
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