Re: [RFC PATCH] sched/cpufreq/schedutil: handling urgent frequency requests

From: Joel Fernandes
Date: Wed May 09 2018 - 03:01:21 EST

On Wed, May 09, 2018 at 12:24:49PM +0530, Viresh Kumar wrote:
> On 09-05-18, 08:45, Juri Lelli wrote:
> > On 08/05/18 21:54, Joel Fernandes wrote:
> > Isn't this potentially introducing unneeded irq pressure (and doing the
> > whole wakeup the kthread thing), while the already active kthread could
> > simply handle multiple back-to-back requests before going to sleep?
> And then we may need more instances of the work item and need to store
> a different value of next_freq with each work item, as we can't use
> the common one anymore as there would be races around accessing it ?

Exactly. I think it also doesn't make sense to over write an already
committed request either so better to store them separate (?). After the
"commit", that previous request is done..

- Joel