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    SubjectRe: [PATCH v3] oom-kill: add lowmem usage aware oom kill handling
    On Tue, 26 Jan 2010 15:12:02 -0800
    Andrew Morton <> wrote:

    > On Mon, 25 Jan 2010 15:15:03 +0900
    > KAMEZAWA Hiroyuki <> wrote:

    > > This patch does
    > > - add sysctl for new bahavior.
    > > - add CONSTRAINT_LOWMEM to oom's constraint type.
    > > - pass constraint to __badness()
    > > - change calculation based on constraint. If CONSTRAINT_LOWMEM,
    > > use low_rss instead of vmsize.
    > >
    > > Changelog 2010/01/25
    > > - showing extension_mask value in OOM kill main log header.
    > > Changelog 2010/01/22:
    > > - added sysctl
    > > - fixed !CONFIG_MMU
    > > - fixed fs/proc/base.c breakacge.
    > It'd be nice to see some testing results for this. Perhaps "here's a
    > test case and here's the before-and-after behaviour".
    Hm. posting test case module is O.K ?
    At leaset, I'll add what test was done and /var/log/message output to the log.

    > I don't like the sysctl knob much.
    me, too.

    > Hardly anyone will know to enable
    > it so the feature won't get much testing and this binary decision
    > fractures the testing effort. It would be much better if we can get
    > everyone running the same code. I mean, if there are certain workloads
    > on certain machines with which the oom-killer doesn't behave correctly
    > then fix it!
    Yes, I think you're right. But "breaking current behaviro of our servers!"
    arguments kills all proposal to this area and this oom-killer or vmscan is
    a feature should be tested by real users. (I'll write fork-bomb detector
    and RSS based OOM again.)

    Then, I'd like to use sysctl. Distro/users can select default value of this
    by /etc/sysctl.conf file, at least.

    > Why was the '#include <linux/sysctl.h>" removed from sysctl.c?
    > The patch adds a random newline to sysctl.c.
    Sorry. my bad.

    > It was never a good idea to add extern declarations to sysctl.c. It's
    > better to add them to a subsystem-specific header file (ie:
    > mm-sysctl.h) and then include that file from the mm files that define
    > or use sysctl_foo, and include it into sysctl.c. Oh well.
    Hmm. Okay. I'll consider about that.


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