cgroup: relocate cgroup_attach_lock within cgroup_procs_write_start

Browse source

Later patches will introduce a new parameter `task` to
cgroup_attach_lock, thus adjusting the position of cgroup_attach_lock
within cgroup_procs_write_start.

Between obtaining the threadgroup leader via PID and acquiring the
cgroup attach lock, the threadgroup leader may change, which could lead
to incorrect cgroup migration. Therefore, after acquiring the cgroup
attach lock, we check whether the threadgroup leader has changed, and if
so, retry the operation.

tj: Minor comment adjustments.

Signed-off-by: Yi Tao <escape@linux.alibaba.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

...

This commit is contained in:

Yi Tao 2025-09-10 14:59:34 +08:00 • committed by Tejun Heo

parent a1ffc8ad31

commit 477abc2ec8

1 changed files with 35 additions and 23 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

58

kernel/cgroup/cgroup.c

View file