On Tue, Jul 03, 2012 at 11:59:51AM +0100, Mel Gorman wrote:
Can you run latencytop to see if there is excessive starvation/wait times for allocation completion?
I'm not sure what format you are looking for. latencytop is shit for capturing information throughout a test and it does not easily allow you to record a snapshot of a test. You can record all the console output of course but that's a complete mess. I tried capturing /proc/latency_stats over time instead because that can be trivially sorted on a system-wide basis but as I write this I find that latency_stats was bust. It was just spitting out
Latency Top version : v0.1
and nothing else. Either latency_stats is broken or my config is. Not sure which it is right now and won't get enough time on this today to pinpoint it.
PEBKAC. Script that monitored /proc/latency_stats was not enabling latency top via /proc/sys/kernel/latencytop