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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2007-05-06 23:50:52 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-07 21:12:59 +0200 |
| commit | 56f99bcb52d64d70078b41cc176dd8b6f5763108 (patch) | |
| tree | 4383e31e46975ae1c1f6c7833bed0766f762f6d5 /kernel/power/power.h | |
| parent | swsusp: fix snapshot_release (diff) | |
| download | linux-56f99bcb52d64d70078b41cc176dd8b6f5763108.tar.xz linux-56f99bcb52d64d70078b41cc176dd8b6f5763108.zip | |
swsusp: free more memory
Move the definition of PAGES_FOR_IO to kernel/power/power.h and introduce
SPARE_PAGES representing the number of pages that should be freed by the
swsusp's memory shrinker in addition to PAGES_FOR_IO so that device drivers
can allocate some memory (up to 1 MB total) in their .suspend() routines
without causing the suspend to fail.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Nigel Cunningham <nigel@nigel.suspend2.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/power/power.h')
| -rw-r--r-- | kernel/power/power.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h index a3e47cbdaf31..34b43542785a 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -14,8 +14,18 @@ struct swsusp_info { #ifdef CONFIG_SOFTWARE_SUSPEND -extern int pm_suspend_disk(void); +/* + * Keep some memory free so that I/O operations can succeed without paging + * [Might this be more than 4 MB?] + */ +#define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT) +/* + * Keep 1 MB of memory free so that device drivers can allocate some pages in + * their .suspend() routines without breaking the suspend to disk. + */ +#define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT) +extern int pm_suspend_disk(void); #else static inline int pm_suspend_disk(void) { |