Hi,
The following patch limits 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).
Please apply (Pavel, please ack if that's ok).
Greetings,
Rafael
Signed-off-by: Rafael J. Wysocki <[email protected]>
kernel/power/power.h | 8 +++-----
kernel/power/swsusp.c | 17 ++++++++---------
2 files changed, 11 insertions(+), 14 deletions(-)
Index: linux-2.6.15-rc5-mm1/kernel/power/power.h
===================================================================
--- linux-2.6.15-rc5-mm1.orig/kernel/power/power.h 2005-12-05 22:07:12.000000000 +0100
+++ linux-2.6.15-rc5-mm1/kernel/power/power.h 2005-12-07 22:16:55.000000000 +0100
@@ -53,12 +53,10 @@
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);
Index: linux-2.6.15-rc5-mm1/kernel/power/swsusp.c
===================================================================
--- linux-2.6.15-rc5-mm1.orig/kernel/power/swsusp.c 2005-12-05 22:07:12.000000000 +0100
+++ linux-2.6.15-rc5-mm1/kernel/power/swsusp.c 2005-12-07 14:15:40.000000000 +0100
@@ -626,7 +626,7 @@
int swsusp_shrink_memory(void)
{
- long tmp;
+ long size, tmp;
struct zone *zone;
unsigned long pages = 0;
unsigned int i = 0;
@@ -634,11 +634,11 @@
printk("Shrinking memory... ");
do {
-#ifdef FAST_FREE
- tmp = 2 * count_highmem_pages();
- tmp += tmp / 50 + count_data_pages();
- tmp += (tmp + PBES_PER_PAGE - 1) / PBES_PER_PAGE +
+ size = 2 * count_highmem_pages();
+ size += size / 50 + count_data_pages();
+ size += (size + PBES_PER_PAGE - 1) / PBES_PER_PAGE +
PAGES_FOR_IO;
+ tmp = size;
for_each_zone (zone)
if (!is_highmem(zone))
tmp -= zone->free_pages;
@@ -647,11 +647,10 @@
if (!tmp)
return -ENOMEM;
pages += tmp;
+ } else if (size > (IMAGE_SIZE * 1024 * 1024) / PAGE_SIZE) {
+ tmp = shrink_all_memory(SHRINK_BITE);
+ pages += tmp;
}
-#else
- tmp = shrink_all_memory(SHRINK_BITE);
- pages += tmp;
-#endif
printk("\b%c", p[i++%4]);
} while (tmp > 0);
printk("\bdone (%lu pages freed)\n", pages);
-
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