[PATCH] swsusp: improve freeing of memory

This patch makes swsusp free only as much memory as needed to complete the
suspend and not as much as possible.   In the most of cases this should speed
up the suspend and make the system much more responsive after resume,
especially if a GUI (eg.  X Windows) is used.

If needed, the old behavior (ie to free as much memory as possible during
suspend) can be restored by unsetting FAST_FREE in power.h

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 27 deletions

diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 76a5131b0e80..9e51cdf7b78d 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -24,6 +24,7 @@
 
 extern suspend_disk_method_t pm_disk_mode;
 
+extern int swsusp_shrink_memory(void);
 extern int swsusp_suspend(void);
 extern int swsusp_write(struct pbe *pblist, unsigned int nr_pages);
 extern int swsusp_check(void);
@@ -73,31 +74,6 @@ static void power_down(suspend_disk_method_t mode)
 static int in_suspend __nosavedata = 0;
 
 
-/**
- *      free_some_memory -  Try to free as much memory as possible
- *
- *      ... but do not OOM-kill anyone
- *
- *      Notice: all userland should be stopped at this point, or
- *      livelock is possible.
- */
-
-static void free_some_memory(void)
-{
-        unsigned int i = 0;
-        unsigned int tmp;
-        unsigned long pages = 0;
-        char *p = "-\\|/";
-
-        printk("Freeing memory...  ");
-        while ((tmp = shrink_all_memory(10000))) {
-                pages += tmp;
-                printk("\b%c", p[i++ % 4]);
-        }
-        printk("\bdone (%li pages freed)\n", pages);
-}
-
-
 static inline void platform_finish(void)
 {
         if (pm_disk_mode == PM_DISK_PLATFORM) {
@@ -127,8 +103,8 @@ static int prepare_processes(void)
         }
 
         /* Free memory before shutting down devices. */
-        free_some_memory();
-        return 0;
+        if (!(error = swsusp_shrink_memory()))
+                return 0;
 thaw:
         thaw_processes();
         enable_nonboot_cpus();