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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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