Fix comment style and elaborate on why anonymous memory is force-scanned when file cache runs low.
Signed-off-by: Johannes Weiner <[email protected]> Reviewed-by: Rik van Riel <[email protected]> Acked-by: Mel Gorman <[email protected]> Reviewed-by: Michal Hocko <[email protected]> --- mm/vmscan.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index c37deaf..510c0d3 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1701,13 +1701,15 @@ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
