Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1639617

Re: [PATCH] sched/deadline: Zero out positive runtime after throttling constrained tasks

Show all headers | View raw

On 05/10/2017 03:03 PM, Xunlei Pang wrote:
> When a contrained task is throttled by dl_check_constrained_dl(),
> it may carry the remaining positive runtime, as a result when
> dl_task_timer() fires and calls replenish_dl_entity(), it will
> not be replenished correctly due to the positive dl_se->runtime.
> 
> This patch assigns its runtime to 0 if positive after throttling.
> 
> Fixes: df8eac8cafce ("sched/deadline: Throttle a constrained deadline task activated after the deadline)
> Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
> Signed-off-by: Xunlei Pang <xlpang@redhat.com>
> ---
>  kernel/sched/deadline.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
> index a2ce590..d3d291e 100644
> --- a/kernel/sched/deadline.c
> +++ b/kernel/sched/deadline.c
> @@ -723,6 +723,8 @@ static inline void dl_check_constrained_dl(struct sched_dl_entity *dl_se)
>  		if (unlikely(dl_se->dl_boosted || !start_dl_timer(p)))
>  			return;
>  		dl_se->dl_throttled = 1;
> +		if (dl_se->runtime > 0)
> +			dl_se->runtime = 0;
>  	}
>  }

Acked-by: Daniel Bristot de Oliveira <bristot@redhat.com>

-- Daniel

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH] sched/deadline: Zero out positive runtime after throttling constrained tasks Xunlei Pang <xlpang@redhat.com> - 2017-05-10 15:10 +0200
  Re: [PATCH] sched/deadline: Zero out positive runtime after  throttling constrained tasks Steven Rostedt <rostedt@goodmis.org> - 2017-05-10 15:40 +0200
    Re: [PATCH] sched/deadline: Zero out positive runtime after  throttling constrained tasks Xunlei Pang <xpang@redhat.com> - 2017-05-11 03:40 +0200
      Re: [PATCH] sched/deadline: Zero out positive runtime after  throttling constrained tasks Xunlei Pang <xpang@redhat.com> - 2017-05-12 05:40 +0200
  Re: [PATCH] sched/deadline: Zero out positive runtime after  throttling constrained tasks Juri Lelli <juri.lelli@arm.com> - 2017-05-11 16:30 +0200
  Re: [PATCH] sched/deadline: Zero out positive runtime after  throttling constrained tasks Daniel Bristot de Oliveira <bristot@redhat.com> - 2017-05-11 16:40 +0200
    Re: [PATCH] sched/deadline: Zero out positive runtime after  throttling constrained tasks Xunlei Pang <xpang@redhat.com> - 2017-05-24 11:00 +0200

csiph-web