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    SubjectRe: [PATCH] fix spurious OOM kills
    On Thu, Nov 11, 2004 at 09:29:22AM -0200, Marcelo Tosatti wrote:
    > Hi,
    > This is an improved version of OOM-kill-from-kswapd patch.
    > I believe triggering the OOM killer from task reclaim context
    > is broken because the chances that it happens increases as the amount
    > of tasks inside reclaim increases - and that approach ignores efforts
    > being done by kswapd, who is the main entity responsible for
    > freeing pages.
    > There have been a few problems pointed out by others (Andrea, Nick) on the
    > last patch - this one solves them.

    I disagree about the design of killing anything from kswapd. kswapd is
    an async helper like pdflush and it has no knowledge on the caller (it
    cannot know if the caller is ok with the memory currently available in
    the freelists, before triggering the oom). I'm just about to move the
    oom killing away from vmscan.c to page_alloc.c which is basically the
    opposite of moving the oom invocation from the task context to kswapd.
    page_alloc.c in the task context is the only one who can know if
    something has to be killed, vmscan.c cannot know. vmscan.c can only know
    if something is still freeable, but if something isn't freeable it
    doesn't mean that we've to kill anything (for example if a task exited
    or some dma or normal-zone or highmem memory was released by another
    task while we were paging waiting for I/O). Every allocation is
    different and page_alloc.c is the only one who knows what has to be done
    for every single allocation.
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