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    SubjectRe: VM in 2.4.7-pre hurts...
    Date
    Hi Mike,

    On Mon, 9 Jul 2001, Mike Galbraith wrote:
    >> But still this may be a hint. You are not running out of swap,
    >> aren't you?
    >
    > I'm running oom whether I have swap enabled or not. The inactive
    > dirty list starts growing forever, until it's full of (aparantly)
    > dirty pages and I'm utterly oom.
    >
    > With swap enabled, I keep allocating until there's nothing left.
    > Actual space usage is roughly 30mb (of 256mb), but when you can't
    > allocate anymore you're toast too, with the same dirt buildup.

    AFAIU you are running oom without the oom killer kicking in.

    That's reasonable with tmpfs: the tmpfs pages are accounted to the
    page cache, but are not freeable if there is no free swap space. So
    the vm tries to free memory without success. (The same should be true
    for ramfs but exaggerated by the fact that ramfs can never free the
    page)

    In the -ac series I introduced separate accounting for shmem pages and
    do reduce the page cache size by this count for meminfo and
    vm_enough_memory. Perhaps the oom coding needs also some knowledge
    about this?

    Greetings
    Christoph


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