cpuset: record old_mems_allowed in struct cpuset

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When we update a cpuset's mems_allowed and thus update tasks'
mems_allowed, it's required to pass the old mems_allowed and new
mems_allowed to cpuset_migrate_mm().

Currently we save old mems_allowed in a temp local variable before
changing cpuset->mems_allowed. This patch changes it by saving
old mems_allowed in cpuset->old_mems_allowed.

This currently won't change any behavior, but it will later allow
us to keep tasks in empty cpusets.

v3: restored "cpuset_attach_nodemask_to = cs->mems_allowed"

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Li Zefan 2013-06-09 17:15:08 +08:00 • committed by Tejun Heo

parent 388afd8549

commit 33ad801dfb

1 changed files with 36 additions and 25 deletions

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kernel/cpuset.c

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