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-rw-r--r--Documentation/cgroup-v2.txt48
1 files changed, 44 insertions, 4 deletions
diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt
index 558c3a739baf..e6101976e0f1 100644
--- a/Documentation/cgroup-v2.txt
+++ b/Documentation/cgroup-v2.txt
@@ -852,13 +852,25 @@ PAGE_SIZE multiple when read back.
The number of times the cgroup's memory usage was
about to go over the max boundary. If direct reclaim
- fails to bring it down, the OOM killer is invoked.
+ fails to bring it down, the cgroup goes to OOM state.
oom
- The number of times the OOM killer has been invoked in
- the cgroup. This may not exactly match the number of
- processes killed but should generally be close.
+ The number of time the cgroup's memory usage was
+ reached the limit and allocation was about to fail.
+
+ Depending on context result could be invocation of OOM
+ killer and retrying allocation or failing alloction.
+
+ Failed allocation in its turn could be returned into
+ userspace as -ENOMEM or siletly ignored in cases like
+ disk readahead. For now OOM in memory cgroup kills
+ tasks iff shortage has happened inside page fault.
+
+ oom_kill
+
+ The number of processes belonging to this cgroup
+ killed by any kind of OOM killer.
memory.stat
@@ -956,6 +968,34 @@ PAGE_SIZE multiple when read back.
Number of times a shadow node has been reclaimed
+ pgrefill
+
+ Amount of scanned pages (in an active LRU list)
+
+ pgscan
+
+ Amount of scanned pages (in an inactive LRU list)
+
+ pgsteal
+
+ Amount of reclaimed pages
+
+ pgactivate
+
+ Amount of pages moved to the active LRU list
+
+ pgdeactivate
+
+ Amount of pages moved to the inactive LRU lis
+
+ pglazyfree
+
+ Amount of pages postponed to be freed under memory pressure
+
+ pglazyfreed
+
+ Amount of reclaimed lazyfree pages
+
memory.swap.current
A read-only single value file which exists on non-root