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    SubjectRe: [PATCH -mm 0/2] Use freezeable workqueues to avoid suspend-related XFS corruptions
    On Fri 2006-11-17 11:50:52, David Chinner wrote:
    > On Thu, Nov 16, 2006 at 09:12:49AM +0100, Rafael J. Wysocki wrote:
    > > Hi,
    > >
    > > The following two patches introduce a mechanism that should allow us to
    > > avoid suspend-related corruptions of XFS without the freezing of bdevs which
    > > Pavel considers as too invasive (apart from this, the freezing of bdevs may
    > > lead to some undesirable interactions with dm and for now it seems to be
    > > supported for real by XFS only).
    > Has this been tested and proven to fix the problem with XFS? It's
    > been asserted that this will fix XFS and suspend, but it's
    > not yet been proven that this is even the problem.
    > I think the problem is a race between sys_sync, the kernel thread
    > freeze and the xfsbufd flushing async, delayed write metadata
    > buffers resulting in a inconsistent suspend image being created.
    > If this is the case, then freezing the workqueues does not
    > fix the problem. i.e:
    > suspend xfs
    > ------- ---
    > sys_sync completes
    > xfsbufd flushes delwri metadata
    > kernel thread freeze
    > workqueue freeze
    > suspend image start
    > async I/O starts to complete
    > suspend image finishes
    > async I/O all complete

    This can't happen, because creating suspend image is atomic. (No
    interrupts, no DMAs, no drivers running).
    (cesky, pictures)
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      Last update: 2006-11-17 16:19    [W:0.033 / U:0.232 seconds]
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