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[23.128.96.18]) by mx.google.com with ESMTP id x2si1248771pjd.41.2021.10.05.01.44.04; Tue, 05 Oct 2021 01:44:17 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@gmx.net header.s=badeba3b8450 header.b=ar3M5d2g; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=gmx.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232871AbhJEIoo (ORCPT + 99 others); Tue, 5 Oct 2021 04:44:44 -0400 Received: from mout.gmx.net ([212.227.17.21]:43867 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230526AbhJEIon (ORCPT ); Tue, 5 Oct 2021 04:44:43 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1633423332; bh=8vloTmutBIqcWlksH5esiytG0nlB3zdmM0rN/4QHZpo=; h=X-UI-Sender-Class:Subject:From:To:Cc:Date:In-Reply-To:References; b=ar3M5d2gUZDbWLyd1lGbMo7aOrwVEEINzMDbLvJnG6U85Q8c+uKHWPRtS7QO/TQqL WMGbSh3FJ6AIn7oIo8sV+5kPYqo8bGCwwjoSbmsIdju1OZMeyS9SIoC4oxCqbb66pu D6SlDkfhOwFRZYGbJ4yw0QOrxgCN5j0N3qp+lB7I= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from homer.fritz.box ([185.191.218.74]) by mail.gmx.net (mrgmx105 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MulmF-1mqIq03vnP-00rnkT; Tue, 05 Oct 2021 10:42:12 +0200 Message-ID: Subject: Re: wakeup_affine_weight() is b0rked - was Re: [PATCH 2/2] sched/fair: Scale wakeup granularity relative to nr_running From: Mike Galbraith To: Mel Gorman Cc: Barry Song <21cnbao@gmail.com>, Peter Zijlstra , Ingo Molnar , Vincent Guittot , Valentin Schneider , Aubrey Li , Barry Song , Srikar Dronamraju , LKML Date: Tue, 05 Oct 2021 10:42:07 +0200 In-Reply-To: <20211005074719.GP3959@techsingularity.net> References: <20210920142614.4891-1-mgorman@techsingularity.net> <20210920142614.4891-3-mgorman@techsingularity.net> <22e7133d674b82853a5ee64d3f5fc6b35a8e18d6.camel@gmx.de> <20210921103621.GM3959@techsingularity.net> <02c977d239c312de5e15c77803118dcf1e11f216.camel@gmx.de> <4f571c5c759b9d356d1bb4114fb169181194a780.camel@gmx.de> <20211005074719.GP3959@techsingularity.net> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.42.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:BYOEhFKj5Pc/3Qc/U3noD5es72ht/FLWnDkRbltiJ1s+IUifPS7 sPoIR5ESZxf4m0uXQXYtMm3iMrMbVkECqRBn5OSpyVaHJH7tLm/6YmiSikxBURyPQLX8D6R EYunBgFUTmgsXBPruut4ndT7ra7yEXvGVr9HuokBpxE2HSChHYu4vmvvCEUR0onoJj5+DXC Aa51bgz00P5cnuvKE2yHQ== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:K2jJnMg12QQ=:pa+21JsPRfpWQS5dGzbBvt QgiP9Ioq+7w34kd6XbAUvjfJG1IYtQvCt8VK9Mcuiga6Vq0Fr4D1PN2HSUOu5Yk6brur9uArK R9irJYiKMPnMf0b8bH/2JIGA4f/Vkct+Iir/V+EsiV+LcAJFbpY/mKSZFzndEqGaaEUHXk4Y6 DRWU1WWLQ/sSR4lvRlxoMjAI9okEO919zNhdn4xhSFdyIFQXNONFF7Nh1JZxEd/ZYfkXR6iMk aVx7Lo32mr7Lxl1TnJoLF9IL0xyOc87XuiuxVjsb6QRqrNlAbthwtMI3eM8tju7aGmcTV9GN2 bBjHMdNOHU0CxYkX/YJYeFqlfbWxS4SRcPRFeEzhyBpcU1LISOrguCUBWZkaNm+Kq1XQRudqU z9qZ8LugQ1KVr/hsiwRVOPt4oHF9x5WF47zer8n09/uL3kxDtED2qgzXFCUYDwjosHbvUYJOl G8F8HsObBCxm5AEwX6qdxoQ1w7yZN3k1dr1giMqqQhZwC8BjBi3UjsC1zMr9PpZBXhQh16CVI dbUfMhOjP+/BNQdveNVeCkLhpDbKpOLet/uC+Z+4yi1Tu/R4E14LRV7u8KZOgr6FqfE5U58vj oNaS5iJ4Nsf/GNcla9atoeCPhQQCFUdKs2+pghTcAnO1/jONI8eZymBcBf8XkCei2/DjISEao 8g/CqFvWrernB1sx8ACmYDppLmj6GoXL+SER5Gv2dJFiqT4mBC0KapOXmYRHmM3PT07AA3KH/ FDL6v/p2Fh2uHUf8gO37xrxvdsFX/sbHdGmFyV4YcOB1Uy6kp7bdr33CQqckO9p0VTfmW8r9f pkPbFen2FkXLzgDOLrO7dAflufK7emidvduLkvfFD9fkBVdc6I5Gx4qeFbOqOA2Qd93IlkOo0 /jay5xu8X+mKefHdx7/uqv/GZITHnTK3X2//gyMY6D/zbh9dnGNkn10EUkKsVAf0wzQDRVAPf zV0uXnvNwPdBYuw2pojtXJZ5BNvUERHApLKm7bMFoS7XiW1qKeFtUPrdDzEcKimEqpXONSv/x QVjKEq+l13CBav3+uv3urwqp49YZr9Or2NdRBRERhNapjq4op/ctteBOyplPMpEPmHy7h9WXU pgBjeo05wdpgjM= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2021-10-05 at 08:47 +0100, Mel Gorman wrote: > On Mon, Oct 04, 2021 at 11:06:30AM +0200, Mike Galbraith wrote: > > > > The mallet below convinced wake_wide() that X waking event threads is > > something it most definitely should care about.=C2=A0 It's not perfect= , can > > get caught with its pants down, because behavior changes a LOT, but I > > at least have to work at it a bit to stack tasks to the ceiling. > > > > With make -j8 running along with firefox with two tabs, one containing > > youtube's suggestions of stuff you probably don't want to watch, the > > other a running clip, if I have the idle tab in focus, and don't drive > > mouse around, flips decay enough for wake_wide() to lose interest, but > > just wiggle the mouse, and it starts waking wide. Focus on the running > > clip, and it continuously wakes wide. =C2=A0 > > > > Hacky, but way better behavior.. at this particular testcase.. in this > > particular box.. at least once :) > > > > Only three machines managed to complete tests overnight. For most > workloads test, it was neutral or slight improvements. For > multi-kernbench__netperf-tcp-rr-multipair (kernel compile + > netperf-tcp-rr combined), there was little to no change. > > For the heavy overloaded cases (hackbench again), it was variable. Worst > improvement was a gain of 1-3%. Best improvement (single socket skylake > with 8 logical CPUs SMT enabled) was 1%-18% depending on the group > count. I wrote up a changelog to remind future me why I bent it up, but I'm not going to submit it. I'll leave the twiddling to folks who can be more responsive to possible (spelled probable;) regression reports than I can be. -Mike