lkml.org 
[lkml]   [2012]   [Feb]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH RFC 0/4] Scheduler idle notifiers and users
From
Date
On Wed, 2012-02-15 at 16:00 +0000, Russell King - ARM Linux wrote:
>
> > A third possibility is to self-IPI and take it from there.. assuming
> > these platforms can actually self-IPI.
>
> Even if there was an IPI (not talking about SMP anyway) I'm not sure
> what good it would be. We can (and do) get an IRQ from the LCD
> controller when its shutdown is complete, but that would have to be
> somehow propagated back up to the cpufreq code. And the cpufreq code
> would have to know that the LCD controller was alive and therefore had
> to be waited for. All sounds rather yucky to me.

If can self-ipi from the scheduler context (which has IRQs disabled),
once you get to the ipi handler your scheduler locks are gone and you
can queue a worklet or wake some kthread to do all the sleeping stuff.




\
 
 \ /
  Last update: 2012-02-15 17:11    [W:0.780 / U:2.852 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site