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    SubjectRe: [Announce] BKL shifting into drivers and filesystems - beware
    On Thu, 13 Jul 2000, Alan Cox wrote:

    >6 weeks to fix the VM is too short. But then I think we may have to accept
    >that we dont get the VM perfect until 2.5. We just need to get it back working
    >as well as 2.0 did

    IMHO the fact the memory balancing doesn't know about the _class_zone
    where the user want to allocate memory is one major problem that we have
    in 2.4.x. Without that chance Juan's kernel will keep trying to take some
    ISA DMA memory free even if he doesn't use floppy or ISA soundcard and it
    won't provide LRU behaviour within the classzone. 2.0.x wasn't wasting
    time this way.

    This is one of the things that is fixed since _ages_ ago (I trapped it as
    soon as it seen the light) in classzone.

    What I mean is that if shrink_mmap doesn't get a zone_t pointer as
    parameter, the VM will always end doing something wrong. There's no way to
    fix that except reinserting the parameter that gives the information about
    the allocation as I did in classzone.

    Also in the long term we'll pass much more than the zone_t information to
    the memory balancing code (we'll add the order of the allocation for
    keeping care of fragmentation and the wanted colour of the page for

    I'll be glad to extract such part of classzone as a clean patch against
    latest Linus's tree if somebody is interested.


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