From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout.gmx.net (mout.gmx.net [212.227.15.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DE957433DA for ; Sun, 28 Apr 2024 16:33:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=212.227.15.15 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714322021; cv=none; b=hlgrH2YNLq9qGQfQzNFibi7Ldk9jXWiBS9JSwj/orDsjaOCBPrh2/Of4hkV4ylK5r4RapVT8fSFlLNfMsGAqaWwzo2dDg8T81hVqM2ip8cslWMjJBeofhlh8rF7TPaUDMB/wQf4CdAUd4hNfevP7EhFMeYF/+0NVe9+aCs8x4os= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714322021; c=relaxed/simple; bh=9ns3Zeagcn2owJh2UVZrXIni5VgaYKCzy1XZ28kpGmw=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=ojqX1iz1Z3AA5cQuEPdF/Rq79R5HA+A64yihq1daWQZvd6xoFckocTiJxooyWNQfiCUpWwKrzKUbLOWSqly4jUMY917UTvTY3zz62qXRL9Z9cMPn+1FLm2qTnDcQO9vAQsP8FTCy21dTEhyH2wXHlXfe1TCQDiko/2jEe9IHWcQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gmx.de; spf=pass smtp.mailfrom=gmx.de; dkim=pass (2048-bit key) header.d=gmx.de header.i=efault@gmx.de header.b=WCzutloV; arc=none smtp.client-ip=212.227.15.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gmx.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmx.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmx.de header.i=efault@gmx.de header.b="WCzutloV" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmx.de; s=s31663417; t=1714321972; x=1714926772; i=efault@gmx.de; bh=XKc8GiNUeMIch2wEoTBmyOb2M49diZSRbPsPlquGtBA=; h=X-UI-Sender-Class:Message-ID:Subject:From:To:Cc:Date:In-Reply-To: References:Content-Type:MIME-Version:Content-Transfer-Encoding:cc: content-transfer-encoding:content-type:date:from:message-id: mime-version:reply-to:subject:to; b=WCzutloVsJBx2ilXu7Wsp8E3TuMcnCu99H2uejtXLxNY3RZcCcK0e8YE+7wUTGhj PE+uNhAc5ZUNyHTkmx8BdR2Key+rbAEBrfBW6HmG1sZdzPyM6MnF3KRGOhEFvVthx 3o5cRzwvdWEJRW5g4VYRrNt++j9UYN4LTVtVeR/xXqaobYlgIDckMuHfYiz+GRjKm 5xsW0ypKcjsVaaWDk9URP9PxLzJ+UNrtSkm44Tf8Upqo48b82bM70GwEiu+exQ1wn RN2qQiituq3D0v34apeRBIKy9XdGLB74UE/xfdUByXx1bfC294JDIs+7WMhuOoSQk AFIWhcmkLI0IZ2ygYw== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from homer.fritz.box ([185.146.49.222]) by mail.gmx.net (mrgmx004 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MBUqL-1rohml10wh-00BFVd; Sun, 28 Apr 2024 18:32:52 +0200 Message-ID: Subject: Re: [RFC][PATCH 08/10] sched/fair: Implement delayed dequeue From: Mike Galbraith To: Peter Zijlstra Cc: K Prateek Nayak , mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, linux-kernel@vger.kernel.org, wuyun.abel@bytedance.com, tglx@linutronix.de, Chen Yu , Oliver Sang Date: Sun, 28 Apr 2024 18:32:49 +0200 In-Reply-To: <8d2fd91db108428680cd4ed988b36cf3f579c5ec.camel@gmx.de> References: <20240405102754.435410987@infradead.org> <20240405110010.631664251@infradead.org> <557be85d-e1c1-0835-eebd-f76e32456179@amd.com> <14330cf4-8d9e-1e55-7717-653b800e5cee@amd.com> <747627a1414f1f33d0c237f555494149d6937800.camel@gmx.de> <2b9f7617f2b2130bb6270504ec3858f15d463f1d.camel@gmx.de> <20240425112855.GF21980@noisy.programming.kicks-ass.net> <20240426105607.GK12673@noisy.programming.kicks-ass.net> <20240426111607.GL12673@noisy.programming.kicks-ass.net> <18f557cd69fc65f5b43daddd8ad3e43278dfa44e.camel@gmx.de> <8d2fd91db108428680cd4ed988b36cf3f579c5ec.camel@gmx.de> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.42.4 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:sVIbo9Cn2EV8gwjvqxk0bVLpmOdONByGQz1/whKZh28uHgdVNkM 1qrL2N1GyXsGCJKCPHNihOS7rAYJUfKGgKSe9EtAJfzuYQ2KG8tqHX5Hv4Sa86h0ICp7/9t EwZ1FCNpueKlydqZG6VWTHAUh2DFG9hkTb8COe7SR3MxLRLblMSoRZ8mDcoF/Mb/eOx/WGh sAxZyAOIJEJSzW1Wg5Vnw== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:ydEGgL5qy8o=;1lFIhO55+OTL6Nxvq/KA5hX/sPV WO/kOpZzypWVPUsIB4R36YJVEgd+AvdHxW3pJ7AVauCZmGOUKFqQmi5gABFx2ZEftQiyqBVTU cXhXbSgTVAcoFzIa55HRVApdHiWa4v/GEm9hOAvBJn0ZbAjTOF0n4otX/dkj6m8yfWgWa3fsV 95TwigeGvQriC1gL2PTbsrG2HdPhvJZ6SzfYSPjdk7/A6F0yhNc10XDc47aQbNXynv01tbAL1 ccBogtUfl7Ylvvk/ovXy882OYMjcc5CMD2bRHMNWcEPhtQt0GniozeTnvmRVk6B59vtpVSWEo cGaEnwAy9sGfaMlr97xZ+6OIZci36l35snq7w4//Wyd0j2JqE60GaDyMrFP+A5R3B2rP68Bvc AvW+ssyXupghtQOL87JenE3amI7AxoEGY56CA7gIOCAJ85az3lltPVfmE8Mq9Mb8CDGuv6pBH sXI63sn0ASGgeFMof5ra1EnZ8M4glKml6xLEiu9mLPaQV4YkPk26q1vPeqqrdb9Z3k2s97dg1 3K06la5UJYj/ln/RYDvqSDM3K/MSSFLTjh6Y8QFZILDA2PgjS5s77h023K/9oJ4Kng4Qvz+nq 0C8ZjHHeU4+l9X9kPuYk7k2ZF1baBlhusM2UkRwqS8awPzGY6WKi88xemTvcbAqE6/uonvyyV EePfecJrQUjb1V6S5TZ46ZBnWW/wD8wBcnNBceDGfCXNaSWSpKT9xi3Fyjz7fUZ7DBSUNGOCm CScd+oFaO+rOaxR0n/gARKH1iWboHbNEGM5J5qgaDxISxV0xWSIC6B0dino5C97CiV7YWfKmB RxGMewnZBo12/BqszUcC6BQCTSPPyLN4rQ/iBZiboZDfc= On Sat, 2024-04-27 at 08:42 +0200, Mike Galbraith wrote: > On Fri, 2024-04-26 at 18:03 +0200, Mike Galbraith wrote: > > fwiw, tbench liked the previous version better. > > The culprit lies somewhere in the new PREEMPT_SHORT patch. Ah, moving the curr eligibility check into pick_curr() left an ineligible curr to be seen/used further down in pick_eevdf(). found: if (!best || (curr && entity_before(curr, best))) best =3D curr; Nit: PREEMPT_SHORT depending on RUN_TO_PARITY looks odd. -Mike