[PATCH] Autoregulated VM swappiness

From: Con Kolivas (kernel_at_kolivas.org)
Date: 05/30/04

  • Next message: Adrian Bunk: "[patch] Re: Gigabit Kconfig problems with yesterday's update" 
    To: Linux Kernel Mailinglist <linux-kernel@vger.kernel.org>
Date:	Sun, 30 May 2004 23:30:41 +1000

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    With all the recent attention paid to swap I thought I'd resync this patch
    with 2.6.7-rc2 in it's more recent incarnation.

    What this patch does is this:
    The swappiness is made proportional to the amount of ram consumed by
    application pages, and inversely proportional to the amount of the last
    (sizeof physical ram) of swap ram used up. This has the effect of hardly ever
    using swap if you have large amounts of cached data by say copying an iso
    image or manipulating video files. Conversely if you have lots of
    applications running at once it will allow the less used ones to swap out by
    increasing the swappiness, giving preference to the "foreground" one.

    Changes from the first version announced on lkml:
    Amount of swap space consumed is also taken into account, and the size of it
    compared to the physical ram is taken into consideration when making it's
    effect on the value of swappiness. With this patch, this should make any
    machine that has swapspace as resistant to OOM as possible.
    This version by default autoregulates the swappiness, but also allows you to
    choose a manual setting if you so desire by

    echo 0 > /proc/sys/vm/autoswappiness

    and then setting the swappiness the manual way as previously. This makes
    comparison with autoregulation easy.
    A few bugfixes.

    Con

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