From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 15 May 2002 10:00:25 -0700 From: William Lee Irwin III Subject: Re: [RFC][PATCH] iowait statistics Message-ID: <20020515170025.GF27957@holomorphy.com> References: <200205151514.g4FFEmY13920@Port.imtp.ilyichevsk.odessa.ua> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Description: brief message Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org Return-Path: To: Rik van Riel Cc: Denis Vlasenko , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Wed, 15 May 2002, Denis Vlasenko wrote: >> I think two patches for same kernel piece at the same time is >> too many. Go ahead and code this if you want. On Wed, May 15, 2002 at 01:13:33PM -0300, Rik van Riel wrote: > OK, here it is. Changes against yesterday's patch: > 1) make sure idle time can never go backwards by incrementing > the idle time in the timer interrupt too (surely we can > take this overhead if we're idle anyway ;)) > 2) get_request_wait also raises nr_iowait_tasks (thanks akpm) > This patch is against the latest 2.5 kernel from bk and > pretty much untested. If you have the time, please test > it and let me know if it works. Boots compiles and runs on an 4-way physical HT box. I didn't wake the evil twins to cut down on the number of variables so it stayed 4-way despite the ability to go 8-way. Sliding window of 120 seconds, sampled every 15 seconds, under a repetitive kernel compile load: Wed May 15 09:56:37 PDT 2002 cpu 60701 0 5137 203545 9327 cpu0 15048 0 1566 50868 2298 cpu1 15257 0 1176 50818 2392 cpu2 15248 0 1346 50802 2247 cpu3 15148 0 1049 51057 2390 Wed May 15 09:56:52 PDT 2002 cpu 66304 0 5543 203545 9327 cpu0 16460 0 1656 50868 2298 cpu1 16606 0 1330 50818 2392 cpu2 16655 0 1441 50802 2247 cpu3 16583 0 1116 51057 2390 Wed May 15 09:57:07 PDT 2002 cpu 71877 0 5980 203545 9327 cpu0 17849 0 1769 50868 2298 cpu1 17972 0 1466 50818 2392 cpu2 18060 0 1539 50802 2247 cpu3 17996 0 1206 51057 2390 Wed May 15 09:57:22 PDT 2002 cpu 77446 0 6420 203545 9327 cpu0 19269 0 1852 50868 2298 cpu1 19328 0 1612 50818 2392 cpu2 19448 0 1653 50802 2247 cpu3 19401 0 1303 51057 2390 Wed May 15 09:57:37 PDT 2002 cpu 83031 0 6843 203545 9327 cpu0 20699 0 1924 50868 2298 cpu1 20704 0 1738 50818 2392 cpu2 20846 0 1757 50802 2247 cpu3 20782 0 1424 51057 2390 Wed May 15 09:57:52 PDT 2002 cpu 87432 0 7216 204779 9328 cpu0 21788 0 2000 51205 2298 cpu1 21737 0 1845 51180 2393 cpu2 21871 0 1806 51230 2247 cpu3 22036 0 1565 51164 2390 Wed May 15 09:58:07 PDT 2002 cpu 93003 0 7653 204779 9328 cpu0 23178 0 2112 51205 2298 cpu1 23134 0 1950 51180 2393 cpu2 23281 0 1898 51230 2247 cpu3 23410 0 1693 51164 2390 Wed May 15 09:58:22 PDT 2002 cpu 98583 0 8082 204779 9328 cpu0 24538 0 2254 51205 2298 cpu1 24521 0 2065 51180 2393 cpu2 24704 0 1978 51230 2247 cpu3 24820 0 1785 51164 2390 It looks very constant, not sure if it should be otherwise. Cheers, Bill -- 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/