• Chen Yu's avatar
    PM / hibernate: Introduce test_resume mode for hibernation · fe12c00d
    Chen Yu authored
    test_resume mode is to verify if the snapshot data
    written to swap device can be successfully restored
    to memory. It is useful to ease the debugging process
    on hibernation, since this mode can not only bypass
    the BIOSes/bootloader, but also the system re-initialization.
    
    To avoid the risk to break the filesystm on persistent storage,
    this patch resumes the image with tasks frozen.
    
    For example:
    echo test_resume > /sys/power/disk
    echo disk > /sys/power/state
    
    [  187.306470] PM: Image saving progress:  70%
    [  187.395298] PM: Image saving progress:  80%
    [  187.476697] PM: Image saving progress:  90%
    [  187.554641] PM: Image saving done.
    [  187.558896] PM: Wrote 594600 kbytes in 0.90 seconds (660.66 MB/s)
    [  187.566000] PM: S|
    [  187.589742] PM: Basic memory bitmaps freed
    [  187.594694] PM: Checking hibernation image
    [  187.599865] PM: Image signature found, resuming
    [  187.605209] PM: Loading hibernation image.
    [  187.665753] PM: Basic memory bitmaps created
    [  187.691397] PM: Using 3 thread(s) for decompression.
    [  187.691397] PM: Loading and decompressing image data (148650 pages)...
    [  187.889719] PM: Image loading progress:   0%
    [  188.100452] PM: Image loading progress:  10%
    [  188.244781] PM: Image loading progress:  20%
    [  189.057305] PM: Image loading done.
    [  189.068793] PM: Image successfully loaded
    Suggested-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: default avatarChen Yu <yu.c.chen@intel.com>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    fe12c00d
swap.c 38 KB