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mm: kswapd: treat zone->all_unreclaimable in sleeping_prematurely similar to balance_pgdat()

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After DEF_PRIORITY, balance_pgdat() considers all_unreclaimable zones to
be balanced but sleeping_prematurely does not.  This can force kswapd to
stay awake longer than it should.  This patch fixes it.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Eric B Munson <emunson@mgebm.net>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Simon Kirby <sim@hostway.ca>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Shaohua Li <shaohua.li@intel.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2011-01-13 15:46:24 -08:00 committed by Linus Torvalds
parent 4d40502ea5
commit 355b09c47a
1 changed files with 9 additions and 1 deletions
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10
mm/vmscan.c
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@ -2244,8 +2244,16 @@ static bool sleeping_prematurely(pg_data_t *pgdat, int order, long remaining)
if (!populated_zone(zone))
continue;
if (zone->all_unreclaimable)
/*
* balance_pgdat() skips over all_unreclaimable after
* DEF_PRIORITY. Effectively, it considers them balanced so
* they must be considered balanced here as well if kswapd
* is to sleep
*/
if (zone->all_unreclaimable) {
balanced += zone->present_pages;
continue;
}
if (!zone_watermark_ok_safe(zone, order, high_wmark_pages(zone),
0, 0))