Re: kswapd in tight loop 2.6.9-rc3-bk-recent

From: Nick Piggin (nickpiggin_at_yahoo.com.au)
Date: 10/08/04

  • Next message: Jesper Juhl: "Re: Possible GPL Violation of Linux in Amstrad's E3 Videophone" 
    Date:	Fri, 08 Oct 2004 10:34:47 +1000
To: Andrew Morton <akpm@osdl.org>

    Andrew Morton wrote:

    >
    >This probably won't fix it.
    >
    >It looks like the code will lock up if all zones are out of unreclaimable
    >memory, but you won't be hitting that.
    >
    >

    Out of _reclaimable_ memory?

    It shouldn't if all_unreclaimable is being set correctly.

    >I also wonder if it'll lock up if just the first zone has ->all_unreclaimable.
    >
    >

    Well, not if the all_unreclaimable flag is set, but if it should be and
    isn't,
    then probably it will lock up.

    >I think a good starting point here will be to revert the most recent
    >change.
    >

    That may fix it for the simple fact that kswapd will just go through its
    priority loop once then stop.

    I think that resetting all_unreclaimable in free_pages_bulk is the wrong
    idea though, because that will keep it clear if a bit of kernel memory is
    being pinned and freed in the background, won't it?

    I had a look and decided that all_unreclaimable should probably be cleared
    only if vmscan.c frees some memory - but I couldn't really come up with any
    hard numbers to back me up :P

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