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    SubjectRe: weird memory related problems, negative memory usage or fake memory usage?
    On Mon, Sep 24, 2001 at 07:03:20PM -0300, Rik van Riel wrote:
    > [Andrea, please read this bugreport ...]
    >
    > On Mon, 24 Sep 2001, Olivier Sessink wrote:
    >
    > > after upgrade from 2.4.10pre8 to 2.4.10 I have weird problems,
    > > Xfree sometimes shows up with 99.9% memory in top (on a box with
    > > 512 mb), and in ps axl it has 4294989036 in the RSS column. When
    > > this happens the box starts to kill some processes, starts
    > > heavily swapping (top reports > 400MB in the cache, but the
    > > machine is heavily swapping!!!) and is completely unusable.
    >
    > > Since this makes the machine completely unusable, and since it is not
    > > happening on 2.4.10pre8 I guess it is a bug ;-)
    >
    > > PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
    > > 1262 root 5 -10 50764 -1M 1320 S < 2.7 99.9 0:01 XFree86
    >
    >
    > It seems Andrea wasn't careful with the merge and
    > backed out some of the locking wrt mm->rss.

    thanks for forwarding this report, actually I just noticed this here and
    that's good so I can reproduce :)

    it is possible it is my mistake, but I don't think so, infact I don't
    recall to have changed rss stuff or locking around it. Incidentally the
    first time I reproduced it here was after the tlb shootdown patch from
    Ben was introduced, never reproduced it here previously with only my
    changes. However it is possibly just a coincidence.

    >
    > Andrea, you may want to spend some time auditing
    > your VM like has been done with the other 2.4 VM.
    >
    > cheers,
    >
    > Rik
    > --
    > IA64: a worthy successor to the i860.
    >
    > http://www.surriel.com/
    > http://www.conectiva.com/ http://distro.conectiva.com/
    >
    >


    Andrea
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