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Commit 11d16c25 authored by Johannes Weiner's avatar Johannes Weiner Committed by Linus Torvalds
Browse files

mm: vmscan: improve comment on low-page cache handling 



Fix comment style and elaborate on why anonymous memory is force-scanned
when file cache runs low.

Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Reviewed-by: default avatarRik van Riel <riel@redhat.com>
Acked-by: default avatarMel Gorman <mgorman@suse.de>
Reviewed-by: default avatarMichal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Satoru Moriya <satoru.moriya@hds.com>
Cc: Simon Jeons <simon.jeons@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 10316b31

mm/vmscan.c

+7 −5
Original line number Diff line number Diff line
@@ -1713,13 +1713,15 @@ 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);

		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;