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    SubjectRe: PERF: performance tests with the split LRU VM in -mm
    On Tue, 29 Jul 2008 15:21:47 +0200
    Johannes Weiner <hannes@saeurebad.de> wrote:

    > Here is my original patch that just gets rid of it. It did not cause
    > any problems to me on high pressure. Rik, you said on IRC that you now
    > also think the patch is safe..?

    Yes. Removing the "+ 1" is safe because we do not scan until
    zone->lru[l].nr_scan reaches swap_cluster_max, which means that
    the scan counter for small lists will also slowly increase and
    no list will be left behind.

    > From: Johannes Weiner <hannes@saeurebad.de>
    > Subject: mm: don't accumulate scan pressure on unrelated lists
    >
    > During each reclaim scan we accumulate scan pressure on unrelated
    > lists which will result in bogus scans and unwanted reclaims
    > eventually.

    This patch fixes the balancing issues that we have been seeing
    with the split LRU VM currently in -mm.

    It is my preferred patch because it removes magic from the VM,
    instead of adding some.

    > Signed-off-by: Johannes Weiner <hannes@saeurebad.de>

    Reviewed-by: Rik van Riel <riel@redhat.com>

    --
    All rights reversed.


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