From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C238CD54A1 for ; Tue, 19 Sep 2023 07:55:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231422AbjISHzE (ORCPT ); Tue, 19 Sep 2023 03:55:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40390 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229771AbjISHzB (ORCPT ); Tue, 19 Sep 2023 03:55:01 -0400 Received: from mout.gmx.net (mout.gmx.net [212.227.15.19]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0F267100 for ; Tue, 19 Sep 2023 00:54:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.de; s=s31663417; t=1695110028; x=1695714828; i=efault@gmx.de; bh=j1Hob52NSsePmsOwioeNCg/WmJRg6bX3WsJNszGJHhY=; h=X-UI-Sender-Class:Subject:From:To:Cc:Date:In-Reply-To:References; b=Z5DwvFRjhkWWkq0NN3zJ2EGGCp/0zm/p0rp9Gkg//wgXEVvmbhFWsRbSulDnIvLiw3JLZ9sm70t qpMuuMXUnXMZ7HvbAbFJFw5YSd812bxZseaHfcF268whkXu7ETNfcj13ql2Fve/HG82AuMijT1KRp 82odX9KPf4BXK61LFYhyuvu14YKJelVpUuVTM2ItT6L2MdOV4V40D1VOH2mw51m1yxnh/ionec2ew 6Mav8vKdd1kTcMKTsTWbWOXRx/JaMBe4JYylA9/j33bRt4gOjHkL8XHFlu6v1SRnlMYhjP8/0cCmd F+3udalCNj4euvX08iPScnNShlPx3pGJBEYg== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from homer.fritz.box ([185.146.50.104]) by mail.gmx.net (mrgmx005 [212.227.17.190]) with ESMTPSA (Nemesis) id 1N8GQs-1rmac82MyW-014DKc; Tue, 19 Sep 2023 09:53:48 +0200 Message-ID: <10cd16558e47ccb43e00261b18e38f4ec2f61690.camel@gmx.de> Subject: Re: [PATCH 2/2] sched/eevdf: Use sched_attr::sched_runtime to set request/slice suggestion From: Mike Galbraith To: peterz@infradead.org, mingo@kernel.org Cc: linux-kernel@vger.kernel.org, vincent.guittot@linaro.org, juri.lelli@redhat.com, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, corbet@lwn.net, qyousef@layalina.io, chris.hyser@oracle.com, patrick.bellasi@matbug.net, pjt@google.com, pavel@ucw.cz, qperret@google.com, tim.c.chen@linux.intel.com, joshdon@google.com, timj@gnu.org, kprateek.nayak@amd.com, yu.c.chen@intel.com, youssefesmat@chromium.org, joel@joelfernandes.org, tglx@linutronix.de, daniel.m.jordan@oracle.com Date: Tue, 19 Sep 2023 09:53:45 +0200 In-Reply-To: <20230915124822.956946622@noisy.programming.kicks-ass.net> References: <20230915124354.416936110@noisy.programming.kicks-ass.net> <20230915124822.956946622@noisy.programming.kicks-ass.net> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.42.4 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K1:N4OA0uNOczmDTP/Sy+gce26zcwxy/j74yHyFNy9Q/wWsz0DKbg1 ghejTdE3lb0MkLd28dRr7qrxIDCRAiFRU997PqU4ujdWTIeK8jh2ILE4OaV1kwQzKYxMsSU CJNtzOkv84fqa0xJH7Lt1zLafq2wTpdfO/hHO1+A6KF9BUcWvYclgIEnsRUIEHyqBKyzMCx VgA3y7q2c+bqQDkRH4rQw== UI-OutboundReport: notjunk:1;M01:P0:36wndeWj+4E=;5iYi8lZHyd4/yk0RNs084974Lgf 4ULv8cO0q1pJaJ2AG+Mb89ayuGTgujX0KdPJpb2x1tBK93qmxz5jXNnbyGe2ENyNdipP3cMnJ v8cAzAw2xRCPpYKauIL2RMCgwGLJ2XrZwxE+L7Y+nxAUU933SkGv9dpHJGx7Hv1GLz0Ofg0eA mIK6z8GPqRnSZKEEYm+77BrxqilAU8Xn0G7jOJaiKedthKktZ5e9ZK9JuTTue7brSTT7Te3XZ bH5HuORFG0dOzAh9iyzD0tcMLmMGr7C/zDJjGEQTugFaLjqzfxzChRYwJ90rHS/ns/JgFfg2F el7xWmhOx7m2bppXQhffZCrYcAavZ4VhpamarwnuSQIjBkc7t7QMikj1ecKGrKWXktqcD3Gzj eVS0RhVwb0aWWoxKG+O8v/yYS3gP54gfIcxRxy8PrZnQamS4av/PRHvbUVwnp4aASH+OiYSy4 XfFheQY6dc81lLKQg9T8ozzEXqY3DSTieqmkT1apSRLm6ddY2JJaCtKgPbpYFOoeN42VjmyD0 3ccybzThaVvkz/RiTVxixF7Mu6du87R28+5MTP806vVOEtcLXflTD4a0FhQFChalnZjH6zfSn cLfTDYuOM+geVUgq18aEQpIG4V3rpnO8Fqm7MOc/Khyk15UUEzg+Nq0RDy2IyjdBOyFcU1gEE 8G0BZMrrYjXroOFZlEMG+31CAk9lNIF72DQN9vmsHmDS19fQjBNywrrMLQ4l1pAhFaT2WrosQ ze2JPaWdigLhPK6gVYFwBbWFw/CJiYvaRuOPYx+QDa9teXQldLmYuF4gezrDKLKrOXYYR5nSS IaeXxA+zNXQWbwK8vyIpkJJM+Fg/A9c00ZA7y5JbOjrVIQ7PWO1vhWetmcB77ZGd9iR6lRZNH Ulwg9N/fP9VLChXI1k0dpU3jK+SJifyKuCgAhm7PWs4j83btJHj+WDb5jZNlTm8lwBIZifVMf DQrUl6FwQXMgksrdA88JvXxG7ug= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2023-09-15 at 14:43 +0200, peterz@infradead.org wrote: > Allow applications to directly set a suggested request/slice length using > sched_attr::sched_runtime. I met an oddity while fiddling to see what a custom slice would do for cyclictest, it seeming to be reasonable target. $subject seems to be working fine per live peek with crash, caveat being it's not alone in otherwise virgin source... homer:..kernel/linux-tip # make -j8 vmlinux && killall cyclictest Elsewhere, post build/kill... instance-a, stock homer:/root # cyclictest -Smq # /dev/cpu_dma_latency set to 0us T: 0 (17763) P: 0 I:1000 C: 297681 Min: 2 Act: 51 Avg: 66 Max: 10482 T: 1 (17764) P: 0 I:1500 C: 198639 Min: 2 Act: 3159 Avg: 70 Max: 9054 T: 2 (17765) P: 0 I:2000 C: 149075 Min: 2 Act: 52 Avg: 78 Max: 8190 T: 3 (17766) P: 0 I:2500 C: 119867 Min: 2 Act: 55 Avg: 77 Max: 8328 T: 4 (17767) P: 0 I:3000 C: 99888 Min: 2 Act: 51 Avg: 90 Max: 8483 T: 5 (17768) P: 0 I:3500 C: 85748 Min: 3 Act: 53 Avg: 76 Max: 8148 T: 6 (17769) P: 0 I:4000 C: 75153 Min: 3 Act: 53 Avg: 92 Max: 7510 T: 7 (17770) P: 0 I:4500 C: 66807 Min: 3 Act: 55 Avg: 81 Max: 8709 instance-b, launched w. custom slice, and verifies via live peek with crash. homer:/root # schedtool -v -s 100000 -e cyclictest -Smq PID 17753: PRIO 0, POLICY N: SCHED_NORMAL , NICE 0, EEVDF_NICE 0, EEVDF_SLICE 100000, AFFINITY 0xff # /dev/cpu_dma_latency set to 0us T: 0 (17754) P: 0 I:1000 C: 297014 Min: 1 Act: 51 Avg: 79 Max: 9584 T: 1 (17755) P: 0 I:1500 C: 198401 Min: 1 Act: 3845 Avg: 118 Max: 9995 T: 2 (17756) P: 0 I:2000 C: 149137 Min: 1 Act: 103 Avg: 125 Max: 8863 T: 3 (17757) P: 0 I:2500 C: 119519 Min: 1 Act: 52 Avg: 218 Max: 9704 T: 4 (17758) P: 0 I:3000 C: 99760 Min: 1 Act: 51 Avg: 134 Max: 11108 T: 5 (17759) P: 0 I:3500 C: 85731 Min: 1 Act: 53 Avg: 234 Max: 9649 T: 6 (17760) P: 0 I:4000 C: 75321 Min: 2 Act: 53 Avg: 139 Max: 7351 T: 7 (17761) P: 0 I:4500 C: 66929 Min: 3 Act: 51 Avg: 191 Max: 6469 ^^^ hmm Those Avg: numbers follow the custom slice. homer:/root # schedtool -v -s 500000 -e cyclictest -Smq PID 29755: PRIO 0, POLICY N: SCHED_NORMAL , NICE 0, EEVDF_NICE 0, EEVDF_SLICE 500000, AFFINITY 0xff # /dev/cpu_dma_latency set to 0us T: 0 (29756) P: 0 I:1000 C: 352348 Min: 1 Act: 51 Avg: 67 Max: 10259 T: 1 (29757) P: 0 I:1500 C: 229618 Min: 1 Act: 59 Avg: 121 Max: 8439 T: 2 (29758) P: 0 I:2000 C: 176031 Min: 1 Act: 54 Avg: 159 Max: 8839 T: 3 (29759) P: 0 I:2500 C: 139346 Min: 1 Act: 52 Avg: 186 Max: 9498 T: 4 (29760) P: 0 I:3000 C: 117779 Min: 2 Act: 54 Avg: 172 Max: 8862 T: 5 (29761) P: 0 I:3500 C: 101272 Min: 1 Act: 54 Avg: 180 Max: 9331 T: 6 (29762) P: 0 I:4000 C: 88781 Min: 3 Act: 54 Avg: 208 Max: 7111 T: 7 (29763) P: 0 I:4500 C: 78986 Min: 1 Act: 143 Avg: 168 Max: 6677 homer:/root # cyclictest -Smq # /dev/cpu_dma_latency set to 0us T: 0 (29747) P: 0 I:1000 C: 354262 Min: 2 Act: 51 Avg: 65 Max: 9754 T: 1 (29748) P: 0 I:1500 C: 236885 Min: 1 Act: 43 Avg: 56 Max: 8434 T: 2 (29749) P: 0 I:2000 C: 177461 Min: 3 Act: 53 Avg: 75 Max: 9028 T: 3 (29750) P: 0 I:2500 C: 142315 Min: 2 Act: 53 Avg: 74 Max: 7654 T: 4 (29751) P: 0 I:3000 C: 118642 Min: 3 Act: 51 Avg: 78 Max: 8169 T: 5 (29752) P: 0 I:3500 C: 101833 Min: 3 Act: 52 Avg: 75 Max: 7790 T: 6 (29753) P: 0 I:4000 C: 89065 Min: 3 Act: 52 Avg: 76 Max: 8001 T: 7 (29754) P: 0 I:4500 C: 79323 Min: 3 Act: 54 Avg: 78 Max: 7703