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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2006-01-06 09:15:56 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-06 17:33:42 +0100 |
| commit | ca0aec0f7a94bf9f07fefa8bfd23282d4e8ceb8a (patch) | |
| tree | 5f31f11eba908545d5e02698fe9c163a8612dd26 /Documentation/power | |
| parent | [PATCH] swsusp: limit image size (diff) | |
| download | linux-ca0aec0f7a94bf9f07fefa8bfd23282d4e8ceb8a.tar.xz linux-ca0aec0f7a94bf9f07fefa8bfd23282d4e8ceb8a.zip | |
[PATCH] swsusp: make image size limit tunable
Make the suspend image size limit tunable via /sys/power/image_size.
It is necessary for systems on which there is a limited amount of swap
available for suspend. It can also be useful for optimizing performance of
swsusp on systems with 1 GB of RAM or more.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/power')
| -rw-r--r-- | Documentation/power/interface.txt | 11 | ||||
| -rw-r--r-- | Documentation/power/swsusp.txt | 5 |
2 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/power/interface.txt b/Documentation/power/interface.txt index f5ebda5f4276..bd4ffb5bd49a 100644 --- a/Documentation/power/interface.txt +++ b/Documentation/power/interface.txt @@ -41,3 +41,14 @@ to. Writing to this file will accept one of It will only change to 'firmware' or 'platform' if the system supports it. +/sys/power/image_size controls the size of the image created by +the suspend-to-disk mechanism. It can be written a string +representing a non-negative integer that will be used as an upper +limit of the image size, in megabytes. The suspend-to-disk mechanism will +do its best to ensure the image size will not exceed that number. However, +if this turns out to be impossible, it will try to suspend anyway using the +smallest image possible. In particular, if "0" is written to this file, the +suspend image will be as small as possible. + +Reading from this file will display the current image size limit, which +is set to 500 MB by default. diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt index b0d50840788e..cd0fcd89a6f0 100644 --- a/Documentation/power/swsusp.txt +++ b/Documentation/power/swsusp.txt @@ -27,6 +27,11 @@ echo shutdown > /sys/power/disk; echo disk > /sys/power/state echo platform > /sys/power/disk; echo disk > /sys/power/state +If you want to limit the suspend image size to N megabytes, do + +echo N > /sys/power/image_size + +before suspend (it is limited to 500 MB by default). Encrypted suspend image: ------------------------ |