cgroup/cpuset: Avoid memory migration when nodemasks match

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With the introduction of ee9707e859 ("cgroup/cpuset: Enable memory
migration for cpuset v2") attaching a process to a different cgroup will
trigger a memory migration regardless of whether it's really needed.
Memory migration is an expensive operation, so bypass it if the
nodemasks passed to cpuset_migrate_mm() are equal.

Note that we're not only avoiding the migration work itself, but also a
call to lru_cache_disable(), which triggers and flushes an LRU drain
work on every online CPU.

Signed-off-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Nicolas Saenz Julienne 2021-08-25 12:54:15 +02:00 • committed by Tejun Heo

parent ee9707e859

commit 9f72daf7ed

1 changed files with 5 additions and 0 deletions

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kernel/cgroup/cpuset.c

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