cgroup: pids: kill pids_fork(), simplify pids_can_fork() and pids_cancel_fork()

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Now that we know that the forking task can't migrate amd the child is always
moved to the same cgroup by cgroup_post_fork()->css_set_move_task() we can
change pids_can_fork() and pids_cancel_fork() to just use task_css(current).
And since we no longer need to pin this css, we can remove pid_fork().

Note: the patch uses task_css_check(true), perhaps it makes sense to add a
helper or change task_css_set_check() to take cgroup_threadgroup_rwsem into
account.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Oleg Nesterov 2015-11-27 19:57:22 +01:00 • committed by Tejun Heo

parent c9e75f0492

commit afbcb364be

1 changed files with 10 additions and 31 deletions

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kernel/cgroup_pids.c

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