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    SubjectRe: Re: [Experimental][PATCH] putback_lru_page rework
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    On Fri, 2008-06-20 at 00:32 +0900, kamezawa.hiroyu@jp.fujitsu.com wrote:
    > ----- Original Message -----
    > >Subject: Re: [Experimental][PATCH] putback_lru_page rework
    > >From: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
    >
    > >On Thu, 2008-06-19 at 09:22 +0900, KAMEZAWA Hiroyuki wrote:
    > >> On Wed, 18 Jun 2008 14:21:06 -0400
    > >> Lee Schermerhorn <Lee.Schermerhorn@hp.com> wrote:
    > >>
    > >> > On Wed, 2008-06-18 at 18:40 +0900, KAMEZAWA Hiroyuki wrote:
    > >> > > Lee-san, how about this ?
    > >> > > Tested on x86-64 and tried Nisimura-san's test at el. works good now.
    > >> >
    > >> > I have been testing with my work load on both ia64 and x86_64 and it
    > >> > seems to be working well. I'll let them run for a day or so.
    > >> >
    > >> thank you.
    > >> <snip>
    > >
    > >Update:
    > >
    > >On x86_64 [32GB, 4xdual-core Opteron], my work load has run for ~20:40
    > >hours. Still running.
    > >
    > >On ia64 [32G, 16cpu, 4 node], the system started going into softlockup
    > >after ~7 hours. Stack trace [below] indicates zone-lru lock in
    > >__page_cache_release() called from put_page(). Either heavy contention
    > >or failure to unlock. Note that previous run, with patches to
    > >putback_lru_page() and unmap_and_move(), the same load ran for ~18 hours
    > >before I shut it down to try these patches.
    > >
    > Thanks, then there are more troubles should be shooted down.
    >
    >
    > >I'm going to try again with the collected patches posted by Kosaki-san
    > >[for which, Thanks!]. If it occurs again, I'll deconfig the unevictable
    > >lru feature and see if I can reproduce it there. It may be unrelated to
    > >the unevictable lru patches.
    > >
    > I hope so...Hmm..I'll dig tomorrow.

    Another update--with the collected patches:

    Again, the x86_64 ran for > 22 hours w/o error before I shut it down.

    And, again, the ia64 went into soft lockup--same stack traces. This
    time after > 17 hours of running. It is possible that a BUG started
    this, but it has long scrolled out of my terminal buffer by the time I
    see the system.

    I'm now trying the ia64 platform with 26-rc5-mm3 + collected patches
    with UNEVICTABLE_LRU de-configured. I'll start that up today and let it
    run over the weekend [with panic_on_oops set] if it hasn't hit the
    problem before I leave.

    Regards,
    Lee



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