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    SubjectRe: [RFC][PATCH 0/2] PM / Sleep: Extended control of suspend/hibernate interfaces

    On Fri, Oct 14, 2011 at 3:45 AM, Rafael J. Wysocki <> wrote:

    > Second, to address the backup problem, we need to allow user space
    > processes other than the suspend/hibernate process itself to prevent the
    > system from being put into sleep states.  A mechanism for that is introduced
    > by the second patch in the form of the /dev/sleepctl special device working
    > kind of like user space wakelocks on Android (although in a simplified
    > fashion).

    I also have another similar example: write(fd, buffer, 100*4096).

    Suppose only 80*4096 are copied into pages of the file, then someone
    run ' echo mem > /sys/power/state ' to trigger system sleep, so only
    partial writing is completed before system sleep and data inconsistence
    may be caused for the file on filesystem.

    But I am not sure if it is possible to happen in reality.

    Ming Lei
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