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-rw-r--r--Documentation/admin-guide/cgroup-v1/memory.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/admin-guide/cgroup-v1/memory.rst b/Documentation/admin-guide/cgroup-v1/memory.rst
index 02b8206a3594..d6b1db8cc7eb 100644
--- a/Documentation/admin-guide/cgroup-v1/memory.rst
+++ b/Documentation/admin-guide/cgroup-v1/memory.rst
@@ -610,6 +610,10 @@ memory.stat file includes following statistics:
'rss + mapped_file" will give you resident set size of cgroup.
+ Note that some kernel configurations might account complete larger
+ allocations (e.g., THP) towards 'rss' and 'mapped_file', even if
+ only some, but not all that memory is mapped.
+
(Note: file and shmem may be shared among other cgroups. In that case,
mapped_file is accounted only when the memory cgroup is owner of page
cache.)