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r: 40692
b: refs/heads/master
c: aaa9b97
h: refs/heads/master
v: v3
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Linus Torvalds committed Nov 4, 2006
1 parent f7356bf commit fe2f189
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2 changes: 1 addition & 1 deletion [refs]
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refs/heads/master: d572b87946f8c598b3cad86a7913862dd48daadb
refs/heads/master: aaa9b971398f62ab97c1da4f7c352667eb3452c9
17 changes: 16 additions & 1 deletion trunk/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
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'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 trunk/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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