On Tue, Jul 03, 2012 at 11:59:51AM +0100, Mel Gorman wrote:

quoted

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

-- 
Mel Gorman
SUSE Labs

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