lkml.org 
[lkml]   [2015]   [Jan]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: [PATCH] sched/fair: Fix RCU stall upon ENOMEM at sched_create_group().
On Thu, Dec 25, 2014 at 10:10:45PM +0900, Tetsuo Handa wrote:
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index ef2b104..586ee15 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -7756,8 +7756,12 @@ static void task_move_group_fair(struct task_struct *p, int queued)
> void free_fair_sched_group(struct task_group *tg)
> {
> int i;
> + struct cfs_bandwidth *cfs_b;
>
> - destroy_cfs_bandwidth(tg_cfs_bandwidth(tg));
> + /* Check whether init_cfs_bandwidth() was called. */
> + cfs_b = tg_cfs_bandwidth(tg);
> + if (cfs_b->throttled_cfs_rq.next)
> + destroy_cfs_bandwidth(cfs_b);
>
> for_each_possible_cpu(i) {
> if (tg->cfs_rq)

This doesn't actually compile for !CONFIG_CFS_BANDWIDTH, how about:

---
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4005,6 +4005,10 @@ void __start_cfs_bandwidth(struct cfs_ba

static void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b)
{
+ /* init_cfs_bandwidth() was not called */
+ if (!cfs_b->throttled_cfs_rq.next)
+ return;
+
hrtimer_cancel(&cfs_b->period_timer);
hrtimer_cancel(&cfs_b->slack_timer);
}

\
 
 \ /
  Last update: 2015-01-06 15:21    [W:0.095 / U:0.964 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site