Re: Strange dcache memory pressure when highmem enabled

[Stephan von Krawczynski <skraw@ithnet.com>]

On Wed, 15 Oct 2003 15:46:11 +1000
Neil Brown <neilb@cse.unsw.edu.au> wrote:

> On Tuesday October 14, akpm@osdl.org wrote:
> > Neil Brown <neilb@cse.unsw.edu.au> wrote:
> > >
> > > I noticed that shrink_caches calls shrink_dcache_memory independant
> > >   of the classzone that is being shrunk.  So if we are trying to
> > >   shrink ZONE_HIGHMEM, the dentry_cache is shrunk, even though the
> > >   dentry_cache doesn't live in highmem.  However I'm not sure if I have
> > >   understood the classzones well enough for that observation even to
> > >   make sense.
> > 
> > Makes heaps of sense.  Here's an instabackport of what we did in
> > 2.6:
> 
> Hey!!! That's what I call *Service*.
> 
> I'll give it a try tomorrow (let the poor students get a feeling of
> stability first before I start changing things again :-)
> 
> > +			if (classzone - classzone->zone_pgdat->node_zones <
> > +						ZONE_HIGHMEM) {
> 
> That's the bit I was missing.  I feel that once I fully understand
> that, I will be a long way towards understanding the zones memory
> management :-)
> 
> NeilBrown

I have another simple advice for you: use the latest 2.4.23-pre. I think I saw
your problem and it seems solved.

Regards,
Stephan