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cgroup: Include dying leaders with live threads in PROCS iterations

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CSS_TASK_ITER_PROCS currently iterates live group leaders; however,
this means that a process with dying leader and live threads will be
skipped.  IOW, cgroup.procs might be empty while cgroup.threads isn't,
which is confusing to say the least.

Fix it by making cset track dying tasks and include dying leaders with
live threads in PROCS iteration.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-and-tested-by: Topi Miettinen <toiwoton@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
This commit is contained in:
Tejun Heo 2019-05-31 10:38:58 -07:00
parent b636fd38dc
commit c03cd7738a
3 changed files with 39 additions and 7 deletions
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1
include/linux/cgroup-defs.h
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@ -216,6 +216,7 @@ struct css_set {
*/
struct list_head tasks;
struct list_head mg_tasks;
struct list_head dying_tasks;
/* all css_task_iters currently walking this cset */
struct list_head task_iters;