[PATCH] swsusp: limit image size

Limit the size of the suspend image to approx.  500 MB, which should
improve the overall performance of swsusp on systems with more than 1 GB of
RAM.

It introduces the constant IMAGE_SIZE that can be set to the preferred size
of the image (in MB) and modifies the memory-shrinking part of swsusp to
take this constant into account (500 is the default value of IMAGE_SIZE).

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>

1 files changed, 3 insertions, 5 deletions

diff --git a/kernel/power/power.h b/kernel/power/power.h
index e521e61e0d95..9b0459903613 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -53,12 +53,10 @@ extern unsigned int nr_copy_pages;
 extern struct pbe *pagedir_nosave;
 
 /*
- * This compilation switch determines the way in which memory will be freed
- * during suspend.  If defined, only as much memory will be freed as needed
- * to complete the suspend, which will make it go faster.  Otherwise, the
- * largest possible amount of memory will be freed.
+ * Preferred image size in MB (set it to zero to get the smallest
+ * image possible)
  */
-#define FAST_FREE       1
+#define IMAGE_SIZE      500
 
 extern asmlinkage int swsusp_arch_suspend(void);
 extern asmlinkage int swsusp_arch_resume(void);