Sami Farin wrote:
On Tue, Sep 04, 2007 at 21:37:35 -0400, Rik van Riel wrote:
Is the system trying to evict pages like crazy when your
system becomes unusable?
I think so..
If so, I wonder if kswapd is simply doing the wrong thing
and trying to evict data from all zones, simply because the
highmem zone is low on free pages...
*shrug*
The attached patch should make sure kswapd does not free an
excessive number of pages in zone_normal just because the
pages in zone_highmem are difficult to free.
It does give kswapd a large margin to continue putting equal
pressure on all zones in normal situations.
Sami, could you try out this patch to see if it helps your
situation?
Signed-off-by: Rik van Riel <[email protected]>
--- linux-2.6.22.noarch/mm/vmscan.c.excessive 2007-09-05 12:19:49.000000000 -0400
+++ linux-2.6.22.noarch/mm/vmscan.c 2007-09-05 12:21:40.000000000 -0400
@@ -1371,7 +1371,13 @@ loop_again:
temp_priority[i] = priority;
sc.nr_scanned = 0;
note_zone_scanning_priority(zone, priority);
- nr_reclaimed += shrink_zone(priority, zone, &sc);
+ /*
+ * We put equal pressure on every zone, unless one
+ * zone has way too many pages free already.
+ */
+ if (!zone_watermark_ok(zone, order, 8*zone->pages_high,
+ end_zone, 0))
+ nr_reclaimed += shrink_zone(priority, zone, &sc);
reclaim_state->reclaimed_slab = 0;
nr_slab = shrink_slab(sc.nr_scanned, GFP_KERNEL,
lru_pages);
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