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    SubjectRe: [PATCH] vmscan: evict use-once pages first (v2)
    On Thu, 30 Apr 2009 00:20:58 -0700
    Elladan <elladan@eskimo.com> wrote:

    > > Elladan, does this smaller patch still work as expected?
    >
    > Rik, since the third patch doesn't work on 2.6.28 (without disabling a lot of
    > code), I went ahead and tested this patch.
    >
    > The system does seem relatively responsive with this patch for the most part,
    > with occasional lag. I don't see much evidence at least over the course of a
    > few minutes that it pages out applications significantly. It seems about
    > equivalent to the first patch.
    >
    > Given Andrew Morton's request that I track the Mapped: field in /proc/meminfo,
    > I went ahead and did that with this patch built into a kernel. Compared to the
    > standard Ubuntu kernel, this patch keeps significantly more Mapped memory
    > around, and it shrinks at a slower rate after the test runs for a while.
    > Eventually, it seems to reach a steady state.
    >
    > For example, with your patch, Mapped will often go for 30 seconds without
    > changing significantly. Without your patch, it continuously lost about
    > 500-1000K every 5 seconds, and then jumped up again significantly when I
    > touched Firefox or other applications. I do see some of that behavior with
    > your patch too, but it's much less significant.

    Were you able to tell whether altering /proc/sys/vm/swappiness appropriately
    regulated the rate at which the mapped page count decreased?

    Thanks.


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