On 24/06/11 12:44, Mel Gorman wrote: > On Thu, Jun 23, 2011 at 08:25:40PM +0100, P?draig Brady wrote: >> On 23/06/11 17:59, Mel Gorman wrote: >>> On Thu, Jun 23, 2011 at 04:32:27PM +0100, P?draig Brady wrote: >>>> On 23/06/11 16:24, Mel Gorman wrote: >>>>> >>>>> 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 >> >>> >>> 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! -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>