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vmscan: kill unnecessary prefetch

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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>
Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KOSAKI Motohiro 2009-09-21 17:01:46 -07:00 committed by Linus Torvalds
parent 74a1c48fb4
commit a26f5320c4
1 changed files with 0 additions and 1 deletions
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1
mm/vmscan.c
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@ -1273,7 +1273,6 @@ static void move_active_pages_to_lru(struct zone *zone,
while (!list_empty(list)) {
page = lru_to_page(list);
prefetchw_prev_lru_page(page, list, flags);
VM_BUG_ON(PageLRU(page));
SetPageLRU(page);