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    SubjectRe: [PATCH] Prevent OOM from killing init
    Doug Ledford wrote:
    > Horst von Brand wrote:
    > >
    > > "Christian Bodmer" <> said:
    > >
    > > > I can't say I understand the whole MM system, however the random killing
    > > > of processes seems like a rather unfortunate solution to the problem. If
    > > > someone has a spare minute, maybe they could explain to me why running
    > > > out of free memory in kswapd results in a deadlock situation.
    > >
    > > OOM is not "normal operations", it is a machine under very extreme stress,
    > > and should *never* happen. To complicate (or even worse, slow down or
    > > otherwise use up resources like memory) normal operations for "better
    > > handling of OOM" is total nonsense.
    > Puh-Leeze. Let's inject some reality into this conversation:
    > [dledford@aic-cvs dledford]$ more kill-list
    > Mar 10 22:02:34 monster kernel: Out of Memory: Killed process 475 (identd).
    > Mar 10 22:03:25 monster kernel: Out of Memory: Killed process 660 (xfs).
    > Mar 22 15:45:54 monster kernel: Out of Memory: Killed process 504 (atd).
    > Mar 22 16:12:13 monster kernel: Out of Memory: Killed process 524 (sshd).
    > [dledford@aic-cvs dledford]$
    > What was that you were saying about "should *never* happen"? Oh, and let's
    > not overlook the fact that it killed off mostly system daemons to start off
    > with while leaving the real culprits alone. Once it did get around to the
    > real culprits (diff and tar), it wasn't even killing them because they were
    > overly large, it was killing them because it wasn't reclaiming space from the
    > buffer cache and page cache. All of the programs running on this machine were
    > never more than roughly 256MB of program code, and this is a 1GB machine.

    This is due to the fact that Riks killer doesn't normalize the
    resource units it's using for measure. Basically the current
    penatly calculations are a good random number generator.

    > This behavior is totally unacceptable and, as Alan put it, is a bug in the
    > code. It should never trigger the oom killer with 750+MB of cache sitting
    > around, but it does. If you want people to buy into the value of the oom
    > killer, you've at least got to get it to quit killing shit when it absolutely
    > doesn't need to.
    > To those people that would suggest I send in code I only have this to say.
    > Fine, I'll send in a patch to fix this bug. It will make the oom killer call
    > the cache reclaim functions and never kill anything. That would at least fix
    > the bug you see above.

    Please just apply it to the patch I have recently send... It will help
    more :-).
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      Last update: 2005-03-22 13:17    [W:0.022 / U:219.592 seconds]
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