"Rafael J. Wysocki" <rjw@xxxxxxx> 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@xxxxxxx>
>>>>> 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
>>> 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
>> 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)"
> This patch is going to be merged into 3.2.
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
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?