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Subject[PATCH 3/5] Kill unnecessary prefetch
Date
Subject: Kill unnecessary prefetch

The pages in the list passed move_active_pages_to_lru() are
already touched by shrink_active_list(). IOW the prefetch in
move_active_pages_to_lru() don't populate any cache. it's pointless.

This patch remove it.


Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
---
mm/vmscan.c | 1 -
1 file changed, 1 deletion(-)
Index: b/mm/vmscan.c
===================================================================
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1225,7 +1225,6 @@ static void move_active_pages_to_lru(str

while (!list_empty(list)) {
page = lru_to_page(list);
- prefetchw_prev_lru_page(page, list, flags);

VM_BUG_ON(PageLRU(page));
SetPageLRU(page);



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