[PATCH 3/5] PM/Suspend: Do not shrink memory before suspend

Rafael J. Wysocki
2009-05-04T00:12:01Z

From: Rafael J. Wysocki <rjw-KKrjLPT3xs0@public.gmane.org>

Remove the shrinking of memory from the suspend-to-RAM code, where
it is not really necessary.

Signed-off-by: Rafael J. Wysocki <rjw-KKrjLPT3xs0@public.gmane.org>
---
kernel/power/main.c | 20 +-------------------
1 file changed, 1 insertion(+), 19 deletions(-)

Index: linux-2.6/kernel/power/main.c
===================================================================
--- linux-2.6.orig/kernel/power/main.c
+++ linux-2.6/kernel/power/main.c
@@ -188,9 +188,6 @@ static void suspend_test_finish(const ch

#endif

-/* This is just an arbitrary number */
-#define FREE_PAGE_NUMBER (100)
-
static struct platform_suspend_ops *suspend_ops;

/**
@@ -226,7 +223,6 @@ int suspend_valid_only_mem(suspend_state
static int suspend_prepare(void)
{
int error;
- unsigned int free_pages;

if (!suspend_ops || !suspend_ops->enter)
return -EPERM;
@@ -241,24 +237,10 @@ static int suspend_prepare(void)
if (error)
goto Finish;

- if (suspend_freeze_processes()) {
- error = -EAGAIN;
- goto Thaw;
- }
-
- free_pages = global_page_state(NR_FREE_PAGES);
- if (free_pages < FREE_PAGE_NUMBER) {
- pr_debug("PM: free some memory\n");
- shrink_all_memory(FREE_PAGE_NUMBER - free_pages);
- if (nr_free_pages() < FREE_PAGE_NUMBER) {
- error = -ENOMEM;
- printk(KERN_ERR "PM: No enough memory\n");
- }
- }
+ error = suspend_freeze_processes();
if (!error)
return 0;

- Thaw:
suspend_thaw_processes();
usermodehelper_enable();