From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mel Gorman Subject: Re: [MMTests] IO metadata on XFS Date: Tue, 3 Jul 2012 12:44:24 +0100 Message-ID: <20120703114424.GC14154@suse.de> References: <20120620113252.GE4011@suse.de> <20120629111932.GA14154@suse.de> <20120629112505.GF14154@suse.de> <20120701235458.GM19223@dastard> <20120702063226.GA32151@infradead.org> <20120702143215.GS14154@suse.de> <20120702193516.GX14154@suse.de> <20120703001928.GV19223@dastard> <20120703105951.GB14154@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Cc: Christoph Hellwig , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, xfs@oss.sgi.com, dri-devel@lists.freedesktop.org, Keith Packard , Eugeni Dodonov , Daniel Vetter , Chris Wilson To: Dave Chinner Return-path: Content-Disposition: inline In-Reply-To: <20120703105951.GB14154@suse.de> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org 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 -- Mel Gorman SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org