Re: Freezer Patches.

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Thu, 2005-06-02 at 00:31 +0200, Pavel Machek wrote:
> Hi!
> 
> (Well, it is just after midnight here :-).
> 
> > > > Here are the freezer patches. They were prepared against rc3, but I
> > > > think they still apply fine against rc5. (Ben, these are the same ones I
> > > > sent you the other day).
> > > 
> > > 304 seems ugly and completely useless for mainline
> > 
> > That's because you don't understand what it's doing.
> > 
> > The new refrigerator implementation works like this:
> > 
> > Userspace processes that begin a sys_*sync gain the process flag
> > PF_SYNCTHREAD for the duration of their syscall.
> 
> swsusp1 should not need any special casing of sync, right? We can
> simply do sys_sync(), then freeze, or something like that. We could
> even remove sys_sync() completely; it is not needed for correctness.

It's still quite nice to have ... I put it in my pre-freeze callback in
fact for both STR and STD :) We really want it for STD but I think it
doesn't work properly after freeze.

Ben.