Re: swsusp performance problems in 2.6.15-rc3-mm1

[Rafael J. Wysocki]

Hi,

On Monday, 12 December 2005 00:28, Pavel Machek wrote:
> > > >  Would that be ok if I made drop_pagecache() nonstatic and called it directly
> > > >  from swsusp?
> > > 
> > > Sure, I'll updates the patch for that.
> > 
> > Thanks a lot.
> >  
> > > It changed a bit..  You'll need to run sys_sync() then drop_pagecache()
> > > then drop_slab().
> > 
> > I think it won't hurt if we do this unconditionally in swsusp_shrink_memory().
> > Pavel, what do you think?
> > 
> > The appended patch illustrates the way in which I think we can use this.
> > I've tested it a little, but if someone feels like trying it, please
>  >  do.
> 
> Not sure, do we really want to drop all the pagecache? We want to free
> memory that is not going to be used soon after suspend, but I guess
> pagecache can be quite "hot".
> 
> I'd certainly wait with this until code settles. And at least trying
> if it helps or hurts...

Sure.  Today it caused my box to stuck in the idle process. ;-)  OTOH,
performance-wise it does not seem to hurt.

Greetings,
Rafael


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