diff options
| author | Mel Gorman <mel@csn.ul.ie> | 2011-01-13 15:46:23 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 17:32:37 -0800 |
| commit | 4d40502ea580c35414a1466d86f96484910ebaec (patch) | |
| tree | ed03d2b5a100be1c3371d304421af221fa893129 /mm | |
| parent | 0abdee2bd4118366c62349a304f81537be69af33 (diff) | |
mm: kswapd: reset kswapd_max_order and classzone_idx after reading
When kswapd wakes up, it reads its order and classzone from pgdat and
calls balance_pgdat. While its awake, it potentially reclaimes at a high
order and a low classzone index. This might have been a once-off that was
not required by subsequent callers. However, because the pgdat values
were not reset, they remain artifically high while balance_pgdat() is
running and potentially kswapd enters a second unnecessary reclaim cycle.
Reset the pgdat order and classzone index after reading.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Eric B Munson <emunson@mgebm.net>
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/vmscan.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 46711f080f38..dafb9d91b604 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2653,6 +2653,8 @@ static int kswapd(void *p) kswapd_try_to_sleep(pgdat, order); order = pgdat->kswapd_max_order; classzone_idx = pgdat->classzone_idx; + pgdat->kswapd_max_order = 0; + pgdat->classzone_idx = MAX_NR_ZONES - 1; } ret = try_to_freeze(); |