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SubjectRe: [PATCH 0/8] Suspend block api (version 8)
On Wed, 26 May 2010 11:45:06 +0200
Peter Zijlstra <peterz@infradead.org> wrote:

> On Wed, 2010-05-26 at 02:41 -0700, Arve Hjønnevåg wrote:
> > On Wed, May 26, 2010 at 1:47 AM, Peter Zijlstra <peterz@infradead.org> wrote:
> > > On Tue, 2010-05-25 at 01:38 +0200, Rafael J. Wysocki wrote:
> > >> > This of course will lead to a scattering of suspend blockers into any
> > >> > drivers/subsystems considered "useful", which by looking through current
> > >> > Android kernels is many of them.
> > >>
> > >> That depends on the maintainers of these subsystems, who still have the power
> > >> to reject requested changes.
> > >
> > > So as a scheduler maintainer I'm going to merge a patch that does a
> > > suspend_blocker when the runqueue's aren't empty... how about that?
> > >
> >
> > I don't know if you are serious, since the all the runqueues are never
> > empty while suspending, this would disable opportunistic suspend
> > altogether.
>
> So why again was this such a great scheme? Go fix your userspace to not
> not run when not needed.

Hi Peter!

This was already mentioned in one of these threads.

The summary is: The device this kernel is running on dosn't want to
(or can) rely on userspace to save power. This is because it is an open
system, without an app-store or the like. Everyone can run what he
wants.

So anything relying on (all) userspace solves a different problem.

Cheers,
Flo




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