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cgroup: don't guarantee cgroup.procs is sorted if sane_behavior

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For some reason, tasks and cgroup.procs guarantee that the result is
sorted.  This is the only reason this whole pidlist logic is necessary
instead of just iterating through sorted member tasks.  We can't do
anything about the existing interface but at least ensure that such
expectation doesn't exist for the new interface so that pidlist logic
may be removed in the distant future.

This patch scrambles the sort order if sane_behavior so that the
output is usually not sorted in the new interface.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2013-11-29 10:42:59 -05:00
parent 045023658c
commit afb2bc14e1
2 changed files with 49 additions and 5 deletions
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3
include/linux/cgroup.h
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@ -275,6 +275,9 @@ enum {
* - "tasks" is removed. Everything should be at process
* granularity. Use "cgroup.procs" instead.
*
* - "cgroup.procs" is not sorted. pids will be unique unless they
* got recycled inbetween reads.
*
* - "release_agent" and "notify_on_release" are removed.
* Replacement notification mechanism will be implemented.
*