From: Christoph Lameter <cl@linux.com>
To: akpm@linux-foundation.org
Cc: npiggin@kernel.dk, Pekka Enberg <penberg@cs.helsinki.fi>,
David Rientjes <rientjes@google.com>,
linux-mm@kvack.org, Andi Kleen <andi@firstfloor.org>
Subject: vmscan: Do not run shrinkers for zones other than ZONE_NORMAL
Date: Thu, 21 Oct 2010 12:59:17 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1010211255570.24115@router.home> (raw)
Slab objects (and other caches) are always allocated from ZONE_NORMAL.
Not from any other zone. Calling the shrinkers for those zones may put
unnecessary pressure on the caches.
Check the zone if we are in a reclaim situation where we are targeting
a specific node. Can occur f.e. in kswapd and in zone reclaim.
Signed-off-by: Christoph Lameter <cl@linux.com>
---
mm/vmscan.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
Index: linux-2.6/mm/vmscan.c
===================================================================
--- linux-2.6.orig/mm/vmscan.c 2010-10-21 12:26:17.000000000 -0500
+++ linux-2.6/mm/vmscan.c 2010-10-21 12:33:56.000000000 -0500
@@ -2218,15 +2218,21 @@ loop_again:
if (!zone_watermark_ok(zone, order,
8*high_wmark_pages(zone), end_zone, 0))
shrink_zone(priority, zone, &sc);
- reclaim_state->reclaimed_slab = 0;
- nr_slab = shrink_slab(sc.nr_scanned, GFP_KERNEL,
- lru_pages);
- sc.nr_reclaimed += reclaim_state->reclaimed_slab;
- total_scanned += sc.nr_scanned;
+
+ if (zone_idx(zone) == ZONE_NORMAL) {
+ reclaim_state->reclaimed_slab = 0;
+ nr_slab = shrink_slab(sc.nr_scanned, GFP_KERNEL,
+ lru_pages);
+ sc.nr_reclaimed += reclaim_state->reclaimed_slab;
+ total_scanned += sc.nr_scanned;
+ } else
+ nr_slab = 0;
+
if (zone->all_unreclaimable)
continue;
if (nr_slab == 0 && !zone_reclaimable(zone))
zone->all_unreclaimable = 1;
+
/*
* If we've done a decent amount of scanning and
* the reclaim ratio is low, start doing writepage
@@ -2697,7 +2703,8 @@ static int __zone_reclaim(struct zone *z
}
nr_slab_pages0 = zone_page_state(zone, NR_SLAB_RECLAIMABLE);
- if (nr_slab_pages0 > zone->min_slab_pages) {
+ if (nr_slab_pages0 > zone->min_slab_pages &&
+ zone_idx(zone) == ZONE_NORMAL) {
/*
* shrink_slab() does not currently allow us to determine how
* many pages were freed in this zone. So we take the current
--
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next reply other threads:[~2010-10-21 17:59 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-21 17:59 Christoph Lameter [this message]
2010-10-21 18:00 ` shrinkers: Add node to indicate where to target shrinking Christoph Lameter
2010-10-21 18:12 ` Andi Kleen
2010-10-21 20:57 ` David Rientjes
2010-10-21 21:07 ` Christoph Lameter
2010-10-22 13:27 ` Andi Kleen
2010-10-21 23:58 ` Nick Piggin
2010-10-22 12:12 ` Andi Kleen
2010-10-22 15:55 ` Christoph Hellwig
2010-10-22 16:32 ` Christoph Lameter
2010-10-24 1:42 ` Nick Piggin
2010-10-25 0:57 ` KOSAKI Motohiro
2010-10-25 14:59 ` Christoph Lameter
2010-11-09 4:03 ` Nick Piggin
2010-10-22 16:46 ` Andi Kleen
2010-10-24 1:31 ` Nick Piggin
2010-11-14 2:26 ` Michel Lespinasse
2010-11-14 7:10 ` KOSAKI Motohiro
2010-11-14 11:05 ` Michel Lespinasse
2010-11-15 0:29 ` KOSAKI Motohiro
2010-10-21 18:13 ` vmscan: Do not run shrinkers for zones other than ZONE_NORMAL Andi Kleen
2010-10-21 18:22 ` Christoph Lameter
2010-10-21 18:27 ` Christoph Lameter
2010-10-21 18:33 ` Andi Kleen
2010-10-21 20:48 ` David Rientjes
2010-10-21 20:54 ` Christoph Lameter
2010-10-21 19:40 ` Andrew Morton
2010-10-21 20:03 ` Christoph Lameter
2010-10-21 20:14 ` Andrew Morton
2010-10-21 20:28 ` Christoph Lameter
2010-10-21 20:36 ` Andrew Morton
2010-10-21 20:49 ` Christoph Lameter
2010-10-21 20:59 ` Andrew Morton
2010-10-21 21:13 ` Christoph Lameter
2010-10-21 21:21 ` Andrew Morton
2010-10-21 23:04 ` Christoph Lameter
2010-10-21 23:56 ` Nick Piggin
2010-10-22 1:37 ` KOSAKI Motohiro
2010-10-22 14:06 ` Christoph Lameter
2010-10-24 1:37 ` Nick Piggin
2010-10-25 1:22 ` KOSAKI Motohiro
2010-10-25 15:07 ` Christoph Lameter
2010-10-26 2:52 ` KOSAKI Motohiro
2010-10-26 12:42 ` KOSAKI Motohiro
2010-10-26 13:10 ` Christoph Lameter
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