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cgroup/cpuset: Skip hardwall ancestor scan in cpuset v2 in cpuset_current_node_allowed()

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Cgroup v2 doesn't have the concept of memory hardwall, only top_cpuset
has CS_MEM_EXCLUSIVE/CS_MEM_HARDWALL flags, nearest_hardwall_ancestor
always returns top_cpuset with all nodes set, so no need to acquire
callback_lock and scan up cpuset.

Suggested-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Chen Wandun <chenwandun@lixiang.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Chen Wandun 2026-05-11 16:18:38 +08:00 committed by Tejun Heo
parent c69e4b0213
commit be2689c9ed
1 changed files with 3 additions and 0 deletions
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3
kernel/cgroup/cpuset.c
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@ -4231,6 +4231,9 @@ bool cpuset_current_node_allowed(int node, gfp_t gfp_mask)
if (gfp_mask & __GFP_HARDWALL) /* If hardwall request, stop here */
return false;
if (cpuset_v2())
return true;
/* Not hardwall and node outside mems_allowed: scan up cpusets */
spin_lock_irqsave(&callback_lock, flags);