On Wed, Oct 27, 2010 at 09:47:35AM +0100, Mel Gorman wrote: ><snip> > To ensure that kswapd wakes up, a safe version of zone_watermark_ok() > is introduced that takes a more accurate reading of NR_FREE_PAGES when > called from wakeup_kswapd, when deciding whether it is really safe to go > back to sleep in sleeping_prematurely() and when deciding if a zone is > really balanced or not in balance_pgdat(). We are still using an expensive > function but limiting how often it is called. ><snip> > Reported-by: Shaohua Li <shaohua.li@xxxxxxxxx> > Signed-off-by: Mel Gorman <mel@xxxxxxxxx> Hi Mel, I notice these aren't flagged for stable, should they be? (They fairly trivially apply and compile on 2.6.36 barring the trace_ points which changed.) I've got a few bug reports against .36/.37 where kswapd has been sleeping for 60s+. I built them some kernels with these patches, but haven't heard back yet as to whether it fixes things for them. Thanks for any insight, Kyle -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>