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mm: Add transformation message for per-memcg swappiness

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The concept of per-memcg swappiness has never landed well in memcg for
cgroup v2. Add a message to users who use it on v1 hierarchy.
Decreased swappiness transforms to memory.swap.max=0 whereas
increased swappiness transforms into active memory.reclaim operation.

Link: https://lore.kernel.org/r/1577252208-32419-1-git-send-email-teawater@gmail.com/
Signed-off-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Michal Koutný 2025-03-11 13:36:25 +01:00 committed by Tejun Heo
parent 103149a063
commit fd4fd0a869
2 changed files with 5 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
Documentation/admin-guide/cgroup-v1/memory.rst
View file

@ -90,6 +90,7 @@ Brief summary of control files.
used.
memory.swappiness set/show swappiness parameter of vmscan
(See sysctl's vm.swappiness)
Per memcg knob does not exist in cgroup v2.
memory.move_charge_at_immigrate This knob is deprecated.
memory.oom_control set/show oom controls.
This knob is deprecated and shouldn't be

6
mm/memcontrol-v1.c
View file

@ -1855,9 +1855,11 @@ static int mem_cgroup_swappiness_write(struct cgroup_subsys_state *css,
if (val > MAX_SWAPPINESS)
return -EINVAL;
if (!mem_cgroup_is_root(memcg))
if (!mem_cgroup_is_root(memcg)) {
pr_info_once("Per memcg swappiness does not exist in cgroup v2. "
"See memory.reclaim or memory.swap.max there\n ")
WRITE_ONCE(memcg->swappiness, val);
else
} else
WRITE_ONCE(vm_swappiness, val);
return 0;