On Mon, Mar 28, 2011 at 04:58:50PM -0700, Andi Kleen wrote: > Dave Chinner <david@xxxxxxxxxxxxx> writes: > > > > First it would be useful to determine why the VM is reclaiming so > > much memory. If it is somewhat predictable when the excessive > > reclaim is going to happen, it might be worth capturing an event > > Often it's to get pages of a higher order. Just tracing alloc_pages > should tell you that. Yes, the kmem/mm_page_alloc tracepoint gives us that. But in case that is not the cause, grabbing all the trace points I suggested is more likely to indicate where the problem is. I'd prefer to get more data than needed the first time around than have to do multiple round trips because a single trace point doesn't tell us the cause... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- 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 internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>