[PATCH 2.6.12-rc5 1/10] mm: hirokazu-steal_page_from_lru.patch

[Ray Bryant <raybry@sgi.com>]

Hi Dave,

Would you apply the following patch right after
AA-PM-01-steal_page_from_lru.patch.

This patch makes steal_page_from_lru() and putback_page_to_lru()
check PageLRU() with zone->lur_lock held. Currently the process
migration code, where Ray is working on, only uses this code.

Thanks,
Hirokazu Takahashi.


Signed-off-by: Hirokazu Takahashi <taka@valinux.co.jp>
---

 linux-2.6.12-rc3-taka/include/linux/mm_inline.h |    8 +++++---
 1 files changed, 5 insertions, 3 deletions

diff -puN include/linux/mm_inline.h~taka-steal_page_from_lru-FIX include/linux/mm_inline.h
--- linux-2.6.12-rc3/include/linux/mm_inline.h~taka-steal_page_from_lru-FIX	Mon May 23 02:26:57 2005
+++ linux-2.6.12-rc3-taka/include/linux/mm_inline.h	Mon May 23 02:26:57 2005
@@ -80,9 +80,10 @@ static inline int
 steal_page_from_lru(struct zone *zone, struct page *page,
 			struct list_head *dst)
 {
-	int ret;
+	int ret = 0;
 	spin_lock_irq(&zone->lru_lock);
-	ret = __steal_page_from_lru(zone, page, dst);
+	if (PageLRU(page))
+		ret = __steal_page_from_lru(zone, page, dst);
 	spin_unlock_irq(&zone->lru_lock);
 	return ret;
 }
@@ -102,7 +103,8 @@ static inline void
 putback_page_to_lru(struct zone *zone, struct page *page)
 {
 	spin_lock_irq(&zone->lru_lock);
-	__putback_page_to_lru(zone, page);
+	if (!PageLRU(page))
+		__putback_page_to_lru(zone, page);
 	spin_unlock_irq(&zone->lru_lock);
 }
 
_


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-- 
Best Regards,
Ray
-----------------------------------------------
Ray Bryant                       raybry@sgi.com
The box said: "Requires Windows 98 or better",
           so I installed Linux.
-----------------------------------------------
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