[PATCH 2/4] vmscan: drop PF_SWAPWRITE from zone_reclaim

KOSAKI Motohiro
2009-05-13T03:19:24Z

Subject: [PATCH] vmscan: drop PF_SWAPWRITE from zone_reclaim

PF_SWAPWRITE mean ignore write congestion. (see may_write_to_queue())

foreground reclaim shouldn't ignore it because to write congested device cause
large IO lantency.
it isn't better than remote node allocation.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>
---
mm/vmscan.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

Index: b/mm/vmscan.c
===================================================================
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2406,7 +2406,7 @@ static int __zone_reclaim(struct zone *z
* and we also need to be able to write out pages for RECLAIM_WRITE
* and RECLAIM_SWAP.
*/
- p->flags |= PF_MEMALLOC | PF_SWAPWRITE;
+ p->flags |= PF_MEMALLOC;
reclaim_state.reclaimed_slab = 0;
p->reclaim_state = &reclaim_state;

@@ -2453,7 +2453,7 @@ static int __zone_reclaim(struct zone *z
}

p->reclaim_state = NULL;
- current->flags &= ~(PF_MEMALLOC | PF_SWAPWRITE);
+ current->flags &= ~PF_MEMALLOC;
return sc.nr_reclaimed >= nr_pages;
}