[Bugme-new] [Bug 33622] New: during hibernation, preallocating image memory can take several minutes

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=33622

           Summary: during hibernation, preallocating image memory can
                    take several minutes
           Product: Power Management
           Version: 2.5
    Kernel Version: 2.6.38.3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: low
          Priority: P1
         Component: Hibernation/Suspend
        AssignedTo: power-management_other at kernel-bugs.osdl.org
        ReportedBy: wferi at niif.hu
        Regression: No


When there isn't much free memory when hibernation is initiated, the
PM: Preallocating image memory...
phase can occasionally take more than 10 minutes, which seems excessive on this
laptop with 512 MB of memory. I understand that in this case quite some stuff
has to be swapped out before the snapshot can be made, but most of this time is
spent with no HDD activity at all: after the first couple of seconds the HDD
indicator gives only the quickest flash in every 2 or 3 seconds.
The worst is that I get no indication whatsoever about the process: at first I
thought the system just froze and powered it off to safely get off the train.
I've had much preferred to be told that hibernation is infeasible and suspended
to RAM instead. But a time estimate could have helped as well, of course.
/sys/power/image_size contains 204791808 all the time, I don't use uswsusp or
similar, pm-utils defaults to the kernel method.

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