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    SubjectRe: [PATCH] PM / Freezer: Freeze filesystems while freezing processes (v2)
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    On Wednesday, November 16, 2011, Ferenc Wagner wrote:
    > "Rafael J. Wysocki" <rjw@sisk.pl> writes:
    >
    > > On Saturday, October 22, 2011, Christoph wrote:
    > >
    > >>> PM / Freezer: Freeze filesystems while freezing processes (v2)
    > >>>
    > >>> On Sunday, August 07, 2011, Dave Chinner wrote:
    > >>>
    > >>>> On Sat, Aug 06, 2011 at 11:17:18PM +0200, Rafael J. Wysocki wrote:
    > >>>>
    > >>>>> From: Rafael J. Wysocki <rjw@sisk.pl>
    > >>>>>
    > >>>>> Freeze all filesystems during the freezing of tasks by calling
    > >>>>> freeze_bdev() for each of them and thaw them during the thawing of
    > >>>>> tasks with the help of thaw_bdev().
    > >>>>>
    > >>>>> This is needed by hibernation, because some filesystems (e.g. XFS)
    > >>>>> deadlock with the preallocation of memory used by it if the memory
    > >>>>> pressure caused by it is too heavy.
    > >>>
    > >>> Below is an alternative fix, the changelog pretty much explains the
    > >>> idea.
    > >>>
    > >>> I've tested it on Toshiba Portege R500, but I don't have an XFS
    > >>> partition to verify that it really helps, so I'd appreciate it if
    > >>> someone able to reproduce the original issue could test it and report
    > >>> back.
    > >>
    > >> Well, the kernel bugtracker is still down and I just like to post my
    > >> experience with kernel (x64) v3.1-rc8/9 + patches. My machine is a
    > >> MacBookPro, doomed with 4GB RAM running debian.
    > >>
    > >> Bug #1
    > >>
    > >> on the way to hibernate, machine hangs on
    > >>
    > >> "PM: Preallocating image memory..."
    > >>
    > >> this patch worked for me now for weeks:
    > >> "[PATCH] PM / Freezer: Freeze filesystems while freezing processes (v2)"
    > >> https://lkml.org/lkml/2011/9/24/77
    > >
    > > This patch is going to be merged into 3.2.
    >
    > Hi,
    >
    > I was the original reporter of the Bugzilla issue, just didn't know
    > about this thread until recently. Anyway, I'm running 3.2-rc1 now,
    > which contains the alternative fix, and I can confirm that it indeed
    > works: hibernation does not deadlock on my XFS rooted system anymore
    > during memory preallocation. Thanks everybody for his or her work on
    > the issue!
    >
    > To add something still, preallocation now ends with a couple of seconds
    > of heavy disk activity, but with several seconds of total inactivity
    > beforehand. Is this warranted by some CPU intensive task at that stage?

    Quilte frankly, I have no idea.

    Thanks,
    Rafael


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