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authorJohannes Weiner <hannes@cmpxchg.org>2016-01-20 15:03:19 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-20 17:09:18 -0800
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mm: memcontrol: basic memory statistics in cgroup2 memory controller
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@cmpxchg.org> Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt
index f441564023e1..65b3eac8856c 100644
--- a/Documentation/cgroup-v2.txt
+++ b/Documentation/cgroup-v2.txt
@@ -819,6 +819,62 @@ PAGE_SIZE multiple when read back.
the cgroup. This may not exactly match the number of
processes killed but should generally be close.
+ memory.stat
+
+ A read-only flat-keyed file which exists on non-root cgroups.
+
+ This breaks down the cgroup's memory footprint into different
+ types of memory, type-specific details, and other information
+ on the state and past events of the memory management system.
+
+ All memory amounts are in bytes.
+
+ The entries are ordered to be human readable, and new entries
+ can show up in the middle. Don't rely on items remaining in a
+ fixed position; use the keys to look up specific values!
+
+ anon
+
+ Amount of memory used in anonymous mappings such as
+ brk(), sbrk(), and mmap(MAP_ANONYMOUS)
+
+ file
+
+ Amount of memory used to cache filesystem data,
+ including tmpfs and shared memory.
+
+ file_mapped
+
+ Amount of cached filesystem data mapped with mmap()
+
+ file_dirty
+
+ Amount of cached filesystem data that was modified but
+ not yet written back to disk
+
+ file_writeback
+
+ Amount of cached filesystem data that was modified and
+ is currently being written back to disk
+
+ inactive_anon
+ active_anon
+ inactive_file
+ active_file
+ unevictable
+
+ Amount of memory, swap-backed and filesystem-backed,
+ on the internal memory management lists used by the
+ page reclaim algorithm
+
+ pgfault
+
+ Total number of page faults incurred
+
+ pgmajfault
+
+ Number of major page faults incurred
+
memory.swap.current
A read-only single value file which exists on non-root