On Wed 12-12-12 16:43:37, Johannes Weiner wrote:
> Fix comment style and elaborate on why anonymous memory is
> force-scanned when file cache runs low.
>
> Signed-off-by: Johannes Weiner <han...@cmpxchg.org>
yes, much better
Reviewed-by: Michal Hocko <mho...@suse.cz>
> ---
> mm/vmscan.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 5e1beed..05475e1 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1697,13 +1697,15 @@ static void get_scan_count(struct lruvec *lruvec,
> struct scan_control *sc,
> file = get_lru_size(lruvec, LRU_ACTIVE_FILE) +
> get_lru_size(lruvec, LRU_INACTIVE_FILE);
>
> + /*
> + * If it's foreseeable that reclaiming the file cache won't be
> + * enough to get the zone back into a desirable shape, we have
> + * to swap. Better start now and leave the - probably heavily
> + * thrashing - remaining file pages alone.
> + */
> if (global_reclaim(sc)) {
> - free = zone_page_state(zone, NR_FREE_PAGES);
> + free = zone_page_state(zone, NR_FREE_PAGES);
> if (unlikely(file + free <= high_wmark_pages(zone))) {
> - /*
> - * If we have very few page cache pages, force-scan
> - * anon pages.
> - */
> fraction[0] = 1;
> fraction[1] = 0;
> denominator = 1;
> --
> 1.7.11.7
>
--
Michal Hocko
SUSE Labs
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