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From: Mel Gorman on 5 Aug 2010 11:20
On Thu, Aug 05, 2010 at 03:13:39PM +0900, KOSAKI Motohiro wrote:
> 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(a)jp.fujitsu.com>

The intention of the code looks fine so;

Acked-by: Mel Gorman <mel(a)csn.ul.ie>

Something like the following might just be easier on the eye but it's a
question of personal taste.

/* Returns true if the page is locked */
static bool lru_lock_page(struct page *page, enum pageout_io sync_writeback)
{
if (likely(sync_writeback == PAGEOUT_IO_ASYNC))
return trylock_page(page);

lock_page(page);
return true;
}

then replace trylock_page() with lru_lock_page(). The naming is vaguely
similar to other helpers like lru_to_page

> ---
> 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
>
>
>

--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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