Re: [RFT][PATCH v1 0/5] cpuidle: menu: Avoid discarding useful information when processing recent idle intervals

[Rafael J. Wysocki]

On Fri, Feb 7, 2025 at 3:48 PM Artem Bityutskiy
<artem.bityutskiy@xxxxxxxxxxxxxxx> wrote:
>
> Hi,
>
> thanks for the patches!
>
> On Thu, 2025-02-06 at 15:21 +0100, Rafael J. Wysocki wrote:
> > Hi Everyone,
> >
> > This work had been triggered by a report that commit 0611a640e60a ("eventpoll:
> > prefer kfree_rcu() in __ep_remove()") had caused the critical-jOPS metric of
> > the SPECjbb 2015 benchmark [1] to drop by around 50% even though it generally
> > reduced kernel overhead.  Indeed, it was found during further investigation
> > that the total interrupt rate while running the SPECjbb workload had fallen as
> > a result of that commit by 55% and the local timer interrupt rate had fallen
> > by
> > almost 80%.
>
> I ran SPECjbb2015 with and it doubles critical-jOPS and basically makes it
> "normal" again. Thanks!
>
> Reported-by: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
> Tested-by: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>

Thank you!