lkml.org 
[lkml]   [2016]   [Oct]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [v4.8-rc1 Regression] sched/fair: Apply more PELT fixes
On Fri, Oct 07, 2016 at 03:38:23PM -0400, Joseph Salisbury wrote:
> Hello Peter,
>
> A kernel bug report was opened against Ubuntu [0]. After a kernel
> bisect, it was found that reverting the following commit resolved this bug:
>
> commit 3d30544f02120b884bba2a9466c87dba980e3be5
> Author: Peter Zijlstra <peterz@infradead.org>
> Date: Tue Jun 21 14:27:50 2016 +0200
>
> sched/fair: Apply more PELT fixes

That commit doesn't revert cleanly, did you take out more?

> The regression was introduced as of v4.8-rc1. The bug can be reproduced
> on an X1 Carbon with the following:
> stress -c $your_total_cpu_cores
>
> I was hoping to get your feedback, since you are the patch author. Do
> you think gathering any additional data will help diagnose this issue,
> or would it be best to submit a revert request?

I'll try and have a look asap, but I'm traveling next week so it might a
tad slower than normal.

If you could provide a /proc/sched_debug dump while the thing is running
that'd might be useful.

Thanks!

\
 
 \ /
  Last update: 2016-10-08 10:01    [W:0.104 / U:0.360 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site