On 24/06/11 12:44, Mel Gorman wrote:

On Thu, Jun 23, 2011 at 08:25:40PM +0100, P?draig Brady wrote:

quoted

On 23/06/11 17:59, Mel Gorman wrote:

quoted

On Thu, Jun 23, 2011 at 04:32:27PM +0100, P?draig Brady wrote:

quoted

On 23/06/11 16:24, Mel Gorman wrote:

quoted

Theory 2 it is then. This is to be applied on top of the patch for
theory 1.

==== CUT HERE ====
mm: vmscan: Prevent kswapd doing excessive work when classzone is unreclaimable

No joy :(

Joy is indeed rapidly fleeing the vicinity.

Check /proc/sys/vm/laptop_mode . If it's set, unset it and try again.

It was not set

quoted

diff --git a/mm/vmscan.c b/mm/vmscan.c
index dce95dd..c8c0f5a 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c

@@ -2426,19 +2426,19 @@ loop_again:
 			 * zone has way too many pages free already.
 			 */
 			if (!zone_watermark_ok_safe(zone, order,
-					8*high_wmark_pages(zone), end_zone, 0))

Note 8 was not in my tree.
Manually applied patch makes no difference :(
Well maybe kswapd0 started spinning a little later.

Gack :)

On further reflection "mm: vmscan: Prevent kswapd doing excessive
work when classzone is unreclaimable" was off but it was along the
right lines in that the balancing classzone was not being considered
when going to sleep.

The following is a patch against mainline 2.6.38.8 and is a
roll-up of four separate patches that includes a new modification to
sleeping_prematurely. Because the stack I am working off has changed
significantly, it's far easier if you apply this on top of a vanilla
fedora branch of 2.6.38 and test rather than trying to backout and
reapply. Depending on when you checked out or if you have applied the
BALANCE_GAP patch yourself, it might collide with 8*high_wmark_pages
but the resolution should be straight-forward.

Thanks for persisting.

Bingo!

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