lkml.org 
[lkml]   [2016]   [Dec]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] cpufreq: schedutil: add up/down frequency transition rate limits
2016-11-21 20:26 GMT+08:00 Peter Zijlstra <peterz@infradead.org>:
> On Mon, Nov 21, 2016 at 12:14:32PM +0000, Juri Lelli wrote:
>> On 21/11/16 11:19, Peter Zijlstra wrote:
>
>> > So no tunables and rate limits here at all please.
>> >
>> > During LPC we discussed the rampup and decay issues and decided that we
>> > should very much first address them by playing with the PELT stuff.
>> > Morton was going to play with capping the decay on the util signal. This
>> > should greatly improve the ramp-up scenario and cure some other wobbles.
>> >
>> > The decay can be set by changing the over-all pelt decay, if so desired.
>> >
>>
>> Do you mean we might want to change the decay (make it different from
>> ramp-up) once for all, or maybe we make it tunable so that we can
>> address different power/perf requirements?
>
> So the limited decay would be the dominant factor in ramp-up time,
> leaving the regular PELT period the dominant factor for ramp-down.
>
> (Note that the decay limit would only be applied on the per-task signal,
> not the accumulated signal.)

What's the meaning of "signal" in this thread?

Regards,
Wanpeng Li

\
 
 \ /
  Last update: 2016-12-29 04:25    [W:0.090 / U:0.048 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site