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authorMario Limonciello <mario.limonciello@dell.com>2018-03-28 12:01:09 -0500
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2018-03-30 12:01:20 +0200
commit355064675f1c997cea017ea64c8f2c216e5425d9 (patch)
tree71dcf9924f7878f793cb72f21f69fad606523b1f /Documentation/power
parentdbdd0f58fd2cdde5cf945c9da67a2d52d32ba550 (diff)
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PM / hibernate: Make passing hibernate offsets more friendly
Currently the only way to specify a hibernate offset for a swap file is on the kernel command line. Add a new /sys/power/resume_offset that lets userspace specify the offset and disk to use when initiating a hibernate cycle. Signed-off-by: Mario Limonciello <mario.limonciello@dell.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/power')
-rw-r--r--Documentation/power/swsusp.txt10
1 files changed, 9 insertions, 1 deletions
diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
index 9f2f942a01cf..cc87adf44c0a 100644
--- a/Documentation/power/swsusp.txt
+++ b/Documentation/power/swsusp.txt
@@ -24,8 +24,16 @@ Some warnings, first.
* see the FAQ below for details. (This is not true for more traditional
* power states like "standby", which normally don't turn USB off.)
+Swap partition:
You need to append resume=/dev/your_swap_partition to kernel command
-line. Then you suspend by
+line or specify it using /sys/power/resume.
+
+Swap file:
+If using a swapfile you can also specify a resume offset using
+resume_offset=<number> on the kernel command line or specify it
+in /sys/power/resume_offset.
+
+After preparing then you suspend by
echo shutdown > /sys/power/disk; echo disk > /sys/power/state