Hi Mel, On Tue, Dec 14, 2010 at 09:45:56AM +0000, Mel Gorman wrote: > On Thu, Dec 09, 2010 at 08:04:07PM +0100, Andrea Arcangeli wrote: > > On Thu, Nov 18, 2010 at 04:22:45PM +0000, Mel Gorman wrote: > > > Just to confirm - by hang, you mean grinds to a slow pace as opposed to > > > coming to a complete stop and having to restart? > > > > Hmm it's like if you're gigabytes in swap and apps hangs for a while > > and system is not really usable and it swaps for most new memory > > allocations despite there's plenty of memory free, but it's not a > > deadlock of course. > > > > Ok, but it's likely to be kswapd being very aggressive because it's > woken up frequently and tries to balance all zones. Once it's not > deadlocking entirely, there isn't a more fundamental bug hiding in there > somewhere. kswapd isn't activated by transhuge allocations because there's khugepaged for that and it's throttle to try a 2m alloc only once per minute if there's fragmentation. So the reason of the trashing is the direct lumpy. -- 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>