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    SubjectRe: Strange dcache memory pressure when highmem enabled
    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
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