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    SubjectProblem remains - page_launder? (Was: Re: [patch *] VM deadlock fix)
    Hi again,

    Further hints.

    More testing (printks in refill_inactive and page_launder)
    reveals that refill_inactive works ok (16 pages) but
    page_launder never succeeds in my lockup state... (WHY)
    alloc fails since there is no inactive_clean and free is
    less than MIN. And then when page_launder fails...

    /RogerL


    Roger Larsson wrote:
    >
    > Hi,
    >
    > Tried your patch on 2.2.4-test9-pre4
    > with the included debug patch applied.
    >
    > Rebooted, started mmap002
    >
    > After a while it starts outputting (magic did not work
    > this time - usually does):
    >
    > - - -
    > "VM: try_to_free_pages (result: 1) try_again # 12345"
    > "VM: try_to_free_pages (result: 1) try_again # 12346"
    > - - -
    >
    > My interpretation:
    > 1) try_to_free_pages succeeds (or returns ok when it did not work)
    > 2) __alloc_pages still can't alloc
    >
    > Maybe it is different limits,
    > try_to_free_pages requires less to succeed than
    > __alloc_pages_limit requires.
    > or a bug in
    > __alloc_pages_limit(zonelist, order, PAGES_MIN, direct_reclaim)
    >
    > Note:
    > 12345 is an example, it loops to over 30000...
    >
    > /RogerL
    >
    > Rik van Riel wrote:
    > >
    > > Hi,
    > >
    > > I've found and fixed the deadlocks in the new VM. They turned out
    > > to be single-cpu only bugs, which explains why they didn't crash my
    > > SMP tesnt box ;)
    > >
    > > They have to do with the fact that processes schedule away while
    > > holding IO locks after waking up kswapd. At that point kswapd
    > > spends its time spinning on the IO locks and single-cpu systems
    > > will die...
    > >
    > > Due to bad connectivity I'm not attaching this patch but have only
    > > put it online on my home page:
    > >
    > > http://www.surriel.com/patches/2.4.0-t9p2-vmpatch
    > >
    > > (yes, I'm at a conference now ... the worst beating this patch
    > > has had is a full night in 'make bzImage' with mem=8m)
    > >
    > > regards,
    > >
    > > Rik
    > > --
    > > "What you're running that piece of shit Gnome?!?!"
    > > -- Miguel de Icaza, UKUUG 2000
    > >
    > > http://www.conectiva.com/ http://www.surriel.com/
    > >
    > > -
    > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    > > the body of a message to majordomo@vger.kernel.org
    > > Please read the FAQ at http://www.tux.org/lkml/
    >
    > --
    > Home page:
    > http://www.norran.net/nra02596/
    >
    > ------------------------------------------------------------------------
    > Name: vmdebug.patch
    > vmdebug.patch Type: Plain Text (text/plain)
    > Encoding: 7bit

    --
    Home page:
    http://www.norran.net/nra02596/
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