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Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linu…
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Dmitry Torokhov committed Nov 5, 2006
2 parents e52b29c + 10b1fbd commit 752c58a
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17 changes: 16 additions & 1 deletion Documentation/ABI/testing/sysfs-power
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Expand Up @@ -21,7 +21,7 @@ Description:
these states.

What: /sys/power/disk
Date: August 2006
Date: September 2006
Contact: Rafael J. Wysocki <rjw@sisk.pl>
Description:
The /sys/power/disk file controls the operating mode of the
Expand All @@ -39,13 +39,28 @@ Description:
'reboot' - the memory image will be saved by the kernel and
the system will be rebooted.

Additionally, /sys/power/disk can be used to turn on one of the
two testing modes of the suspend-to-disk mechanism: 'testproc'
or 'test'. If the suspend-to-disk mechanism is in the
'testproc' mode, writing 'disk' to /sys/power/state will cause
the kernel to disable nonboot CPUs and freeze tasks, wait for 5
seconds, unfreeze tasks and enable nonboot CPUs. If it is in
the 'test' mode, writing 'disk' to /sys/power/state will cause
the kernel to disable nonboot CPUs and freeze tasks, shrink
memory, suspend devices, wait for 5 seconds, resume devices,
unfreeze tasks and enable nonboot CPUs. Then, we are able to
look in the log messages and work out, for example, which code
is being slow and which device drivers are misbehaving.

The suspend-to-disk method may be chosen by writing to this
file one of the accepted strings:

'firmware'
'platform'
'shutdown'
'reboot'
'testproc'
'test'

It will only change to 'firmware' or 'platform' if the system
supports that.
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2 changes: 1 addition & 1 deletion Documentation/DocBook/Makefile
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DOCBOOKS := wanbook.xml z8530book.xml mcabook.xml videobook.xml \
kernel-hacking.xml kernel-locking.xml deviceiobook.xml \
procfs-guide.xml writing_usb_driver.xml \
kernel-api.xml journal-api.xml lsm.xml usb.xml \
kernel-api.xml filesystems.xml lsm.xml usb.xml \
gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml \
genericirq.xml

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