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    Subject[PATCH 3/7] vmscan: synchrounous lumpy reclaim use lock_page() instead trylock_page()
    Date
    When synchrounous lumpy reclaim, there is no reason to give up to
    reclaim pages even if page is locked. We use lock_page() instead
    trylock_page() in this case.

    Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    ---
    mm/vmscan.c | 4 +++-
    1 files changed, 3 insertions(+), 1 deletions(-)

    diff --git a/mm/vmscan.c b/mm/vmscan.c
    index 1cdc3db..833b6ad 100644
    --- a/mm/vmscan.c
    +++ b/mm/vmscan.c
    @@ -665,7 +665,9 @@ static unsigned long shrink_page_list(struct list_head *page_list,
    page = lru_to_page(page_list);
    list_del(&page->lru);

    - if (!trylock_page(page))
    + if (sync_writeback == PAGEOUT_IO_SYNC)
    + lock_page(page);
    + else if (!trylock_page(page))
    goto keep;

    VM_BUG_ON(PageActive(page));
    --
    1.6.5.2




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