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| author |   Chris Down <chris@chrisdown.name> | 2019-11-30 17:50:19 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2019-12-01 06:29:18 -0800 |
| commit | 1603c8d1b1fbfbc20dcb363543b690de862849c0 (patch) | |
| tree | 3c2e76c8b974650e7924766abfb7e50d25eb53e0 /Documentation/admin-guide | |
| parent | mm: vmscan: memcontrol: remove mem_cgroup_select_victim_node() (diff) | |
| download | linux-dev-1603c8d1b1fbfbc20dcb363543b690de862849c0.tar.xz linux-dev-1603c8d1b1fbfbc20dcb363543b690de862849c0.zip | |
Documentation/admin-guide/cgroup-v2.rst: document why inactive_X + active_X may not equal X
This has confused a significant number of people using cgroups inside
Facebook, and some of those outside as well judging by posts like
this[0] (although it's not a problem unique to cgroup v2).
If shmem handling in particular becomes more coherent at some point in
the future -- although that seems unlikely now -- we can change the
wording here.
[0]: https://unix.stackexchange.com/q/525092/10762
Link: http://lkml.kernel.org/r/20191111144958.GA11914@chrisdown.name
Signed-off-by: Chris Down <chris@chrisdown.name>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Roman Gushchin <guro@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/cgroup-v2.rst | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index 007ba86aef78..6d13f2de6d69 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -1288,7 +1288,12 @@ PAGE_SIZE multiple when read back. 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 + page reclaim algorithm. + + As these represent internal list state (eg. shmem pages are on anon + memory management lists), inactive_foo + active_foo may not be equal to + the value for the foo counter, since the foo counter is type-based, not + list-based. slab_reclaimable Part of "slab" that might be reclaimed, such as |