[lkml]   [2016]   [Feb]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 3/3 v5] cpufreq: governor: Replace timers with utilization update callbacks
On Tue, Feb 9, 2016 at 11:01 AM, Gautham R Shenoy
<> wrote:
> Hello Rafael,
> On Sun, Feb 07, 2016 at 03:50:31PM +0100, Rafael J. Wysocki wrote:
>> From: Rafael J. Wysocki <>
>> Instead of using a per-CPU deferrable timer for queuing up governor
>> work items, register a utilization update callback that will be
>> invoked from the scheduler on utilization changes.
>> The sampling rate is still the same as what was used for the
>> deferrable timers and the added irq_work overhead should be offset by
>> the eliminated timers overhead, so in theory the functional impact of
>> this patch should not be significant.
> I tested this patch series (including v5 of PATCH 3) on POWER with
> Viresh's CPUFreq test suite. I didn't see any issues with the
> patchset except for a lockdep splat involving "s_active" and
> "od_dbs_cdata.mutex", which was also observed on 4.5-rc3 and which
> was fixed by Viresh's recent patches.
> With a kernbench run, there were no regression when compared to 4.5-rc3.
> FWIW, Tested-by: Gautham R. Shenoy <>

Thank you!

 \ /
  Last update: 2016-02-09 20:21    [W:0.100 / U:4.920 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site