Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

Thomas Gleixner
2010-05-27T18:20:11Z

On Thu, 27 May 2010, Matthew Garrett wrote:

> On Thu, May 27, 2010 at 06:49:18PM +0100, Alan Cox wrote:
> > > ACPI provides no guarantees about what level of hardware functionality
> > > remains during S3. You don't have any useful ability to determine which
> > > events will generate wakeups. And from a purely practical point of view,
> > > since the latency is in the range of seconds, you'll never have a low
> > > enough wakeup rate to hit it.
> >
> > So PCs with current ACPI don't get opportunistic suspend capability. It
> > probably won't be supported on the Commodore Amiga either - your point ?
>
> Actually, the reverse - there's no terribly good way to make PCs work
> with scheduler-based suspend, but there's no reason why they wouldn't
> work with the current opportunistic suspend implementation.

How does that solve the problems you mentioned above ? Wakeup
guarantees, latencies ...

It's not a prove of the technical correctness of the approach if it
can provide a useless functionality.

Thanks,

tglx