The patch titled
Subject: selftests: test_zswap: add test for hierarchical zswap.writeback
has been added to the -mm mm-unstable branch. Its filename is
selftests-test_zswap-add-test-for-hierarchical-zswapwriteback.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-test_zswap-add-test-for-hierarchical-zswapwriteback.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Mike Yuan <me@xxxxxxxxxxx>
Subject: selftests: test_zswap: add test for hierarchical zswap.writeback
Date: Fri, 23 Aug 2024 16:27:09 +0000
Ensure that zswap.writeback check goes up the cgroup tree, i.e. is
hierarchical. Create a subcgroup which has zswap.writeback set to 1, and
the upper hierarchy's restrictions shall apply.
Link: https://lkml.kernel.org/r/20240823162506.12117-2-me@xxxxxxxxxxx
Signed-off-by: Mike Yuan <me@xxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Michal Koutný <mkoutny@xxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Nhat Pham <nphamcs@xxxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Shakeel Butt <shakeel.butt@xxxxxxxxx>
Cc: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/admin-guide/cgroup-v2.rst | 2 ++
1 file changed, 2 insertions(+)
--- a/Documentation/admin-guide/cgroup-v2.rst~selftests-test_zswap-add-test-for-hierarchical-zswapwriteback
+++ a/Documentation/admin-guide/cgroup-v2.rst
@@ -1756,6 +1756,8 @@ The following nested keys are defined.
Note that this is subtly different from setting memory.swap.max to
0, as it still allows for pages to be written to the zswap pool.
+ This setting has no effect if zswap is disabled, and swapping
+ would be allowed unless memory.swap.max is set to 0.
memory.pressure
A read-only nested-keyed file.
_
Patches currently in -mm which might be from me@xxxxxxxxxxx are
mm-memcontrol-respect-zswapwriteback-setting-from-parent-cg-too.patch
documentation-cgroup-v2-clarify-that-zswapwriteback-is-ignored-if-zswap-is-disabled.patch
selftests-test_zswap-add-test-for-hierarchical-zswapwriteback.patch
