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[PATCH] swsusp: make image size limit tunable

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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>
This commit is contained in:
Rafael J. Wysocki
2006-01-06 00:15:56 -08:00
committed by Linus Torvalds
parent b3a93a255e
commit ca0aec0f7a
5 changed files with 47 additions and 6 deletions
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10
kernel/power/swsusp.c
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@@ -69,6 +69,14 @@
#include "power.h"
/*
* Preferred image size in MB (tunable via /sys/power/image_size).
* When it is set to N, swsusp will do its best to ensure the image
* size will not exceed N MB, but if that is impossible, it will
* try to create the smallest image possible.
*/
unsigned int image_size = 500;
#ifdef CONFIG_HIGHMEM
unsigned int count_highmem_pages(void);
int save_highmem(void);
@@ -647,7 +655,7 @@ int swsusp_shrink_memory(void)
if (!tmp)
return -ENOMEM;
pages += tmp;
} else if (size > (IMAGE_SIZE * 1024 * 1024) / PAGE_SIZE) {
} else if (size > (image_size * 1024 * 1024) / PAGE_SIZE) {
tmp = shrink_all_memory(SHRINK_BITE);
pages += tmp;
}