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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2006-12-06 20:34:13 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:39:27 -0800 |
| commit | ecbd0da1eced957e0cbb611b4a4cb5b0cf63ba31 (patch) | |
| tree | c7756453fa284eb1cf27b914be9ea9a8303b87d4 /Documentation/power/swsusp.txt | |
| parent | 9a154d9d95b7b9845938242f5c62505b3cab5bcd (diff) | |
| download | linux-ecbd0da1eced957e0cbb611b4a4cb5b0cf63ba31.tar.gz linux-ecbd0da1eced957e0cbb611b4a4cb5b0cf63ba31.tar.bz2 linux-ecbd0da1eced957e0cbb611b4a4cb5b0cf63ba31.zip | |
[PATCH] swsusp: document support for swap files
Document the "resume_offset=" command line parameter as well as the way in
which swap files are supported by swsusp.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: 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/swsusp.txt')
| -rw-r--r-- | Documentation/power/swsusp.txt | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt index e635e6f1e316..0761ff6c57ed 100644 --- a/Documentation/power/swsusp.txt +++ b/Documentation/power/swsusp.txt @@ -297,20 +297,12 @@ system is shut down or suspended. Additionally use the encrypted suspend image to prevent sensitive data from being stolen after resume. -Q: Why can't we suspend to a swap file? +Q: Can I suspend to a swap file? -A: Because accessing swap file needs the filesystem mounted, and -filesystem might do something wrong (like replaying the journal) -during mount. - -There are few ways to get that fixed: - -1) Probably could be solved by modifying every filesystem to support -some kind of "really read-only!" option. Patches welcome. - -2) suspend2 gets around that by storing absolute positions in on-disk -image (and blocksize), with resume parameter pointing directly to -suspend header. +A: Generally, yes, you can. However, it requires you to use the "resume=" and +"resume_offset=" kernel command line parameters, so the resume from a swap file +cannot be initiated from an initrd or initramfs image. See +swsusp-and-swap-files.txt for details. Q: Is there a maximum system RAM size that is supported by swsusp? |