Re: [PATCH v8 00/25] timer: Move from a push remote at enqueue to a pull at expiry model

[Anna-Maria Behnsen]

"Pandruvada, Srinivas" <srinivas.pandruvada@xxxxxxxxx> writes:

> Hi Maria,
>
> On Wed, 2023-10-04 at 14:34 +0200, Anna-Maria Behnsen wrote:
>> Hi,
>> 
>> 
>
> [...]
>
>> 
>> The proper solution to this problem is to always queue the timers on
>> the
>> local CPU and allow the non pinned timers to be pulled onto a busy
>> CPU at
>> expiry time.
>
> Thanks for these patches. I am looking for saving power during video
> playback with our low power daemon. I use cgroup v2 isolation to keep
> some CPUs idle (CPU 0-11) and video is played on a single module (CPU
> 12-15).
>
> I have some kernelshark pictures at below link. The traces are
> collected with sched, timer and irq. With 6.6-rc5, you can see some
> timers still expires on CPUs which I want to keep idle. With timer
> patches added, they are mostly pulled to busy CPU. 
>
> https://imgur.com/a/8nF5OoP
>
> I can share the .dat files, but they are too big to attach here.

Thanks a lot for testing! The images are totally fine (at least for
me). As there are still some issues in v8, I'll have to post a new
version...

Thanks,

	Anna-Maria