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Subject[PATCH 1/6] PM/Suspend: Do not shrink memory before suspend
Date
From: Rafael J. Wysocki <rjw@sisk.pl>

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

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Nigel Cunningham <nigel@tuxonice.net>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
---
kernel/power/main.c | 20 +-------------------
mm/vmscan.c | 4 ++--
2 files changed, 3 insertions(+), 21 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();
Finish:
Index: linux-2.6/mm/vmscan.c
===================================================================
--- linux-2.6.orig/mm/vmscan.c
+++ linux-2.6/mm/vmscan.c
@@ -2054,7 +2054,7 @@ unsigned long global_lru_pages(void)
+ global_page_state(NR_INACTIVE_FILE);
}

-#ifdef CONFIG_PM
+#ifdef CONFIG_HIBERNATION
/*
* Helper function for shrink_all_memory(). Tries to reclaim 'nr_pages' pages
* from LRU lists system-wide, for given pass and priority.
@@ -2194,7 +2194,7 @@ out:

return sc.nr_reclaimed;
}
-#endif
+#endif /* CONFIG_HIBERNATION */

/* It's optimal to keep kswapds on the same CPUs as their memory, but
not required for correctness. So if the last cpu in a node goes


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