On Wed, Aug 25, 2021 at 12:54:15PM +0200, Nicolas Saenz Julienne wrote:
> With the introduction of ee9707e8593d ("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@xxxxxxxxxx>
Applied to cgroup/for-5.15.
Thanks.
--
tejun
