[lkml]   [2016]   [Jul]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Severe performance regression w/ 4.4+ on Android due to cgroup locking changes
On Wed, Jul 13, 2016 at 4:02 PM, Paul E. McKenney
<> wrote:
> On Wed, Jul 13, 2016 at 03:39:37PM -0700, John Stultz wrote:
>> But otherwise both patches look great and are working well!
>> Do you mind marking them both for stable 4.4+?
> OK, looks like it does qualify in the "fix a notable performance or
> interactivity issue" category.
>> Tested-by: John Stultz <>
>> Acked-by: John Stultz <>
>> Also, do make sure Dmitry gets the reported-by credit for the first patch.
> Done! The updated first patch is below, and the second will follow.

So just as a heads up, while this patch *greatly* improved the
situation, apparently the occasional 7ms spikes (again, much better
then 80ms!) still seen are causing trouble when compared w/ the 4.1 or
earlier kernels (which I think kept things sub-ms - Dmitry, please
correct me).

So I wanted to dampen my enthusiasm a touch for this, as there may yet
further improvements needed. I'll try to get some more info on this
as soon as I have details.


 \ /
  Last update: 2016-07-14 19:21    [W:0.078 / U:3.316 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site