[PATCH v2 RFT 2/2] PM / Hibernate: add section for resume options
From: Sebastian Capella <hidden>
Date: 2013-08-28 01:14:27
Also in:
linux-pm, lkml
Subsystem:
suspend to ram, the rest · Maintainers:
"Rafael J. Wysocki", Linus Torvalds
Expand the existing documentation to explicitly list the options for resuming a hibernation image, including the manual resume option which can be used from the initrd or initramfs and the kernel init resume. Signed-off-by: Sebastian Capella <redacted> Cc: Rob Landley <redacted> Cc: Len Brown <redacted> Cc: Pavel Machek <redacted> Cc: "Rafael J. Wysocki" <redacted> --- Documentation/power/swsusp.txt | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
index 0b4b63e..079160e 100644
--- a/Documentation/power/swsusp.txt
+++ b/Documentation/power/swsusp.txt@@ -50,6 +50,19 @@ echo N > /sys/power/image_size before suspend (it is limited to 500 MB by default). +. The resume process checks for the presence of the resume device, +if found, it then checks the contents for the hibernation image signature. +If both are found, it resumes the hibernation image. + +. The resume process may be triggered in two ways: + 1) During lateinit: If resume=/dev/your_swap_partition is specified on + the kernel command line, lateinit runs the resume process. If the + resume device has not been probed yet, the resume process fails and + bootup continues. + 2) Manually from an initrd or initramfs: May be run from + the init script by using the /sys/power/resume file. It is vital + that this be done prior to remounting any filesystems (even as + read-only) otherwise data may be corrupted. Article about goals and implementation of Software Suspend for Linux ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -326,7 +339,7 @@ Q: How can distributions ship a swsusp-supporting kernel with modular disk drivers (especially SATA)? A: Well, it can be done, load the drivers, then do echo into -/sys/power/disk/resume file from initrd. Be sure not to mount +/sys/power/resume file from initrd. Be sure not to mount anything, not even read-only mount, or you are going to lose your data.
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1.7.9.5