Received: by 2002:ac0:a5a6:0:0:0:0:0 with SMTP id m35-v6csp5251753imm; Tue, 18 Sep 2018 06:44:52 -0700 (PDT) X-Google-Smtp-Source: ANB0Vdaz93+GQOI6dRdovTlmyMS8c2PR2w947Ba7T96udIpl4z/76ewms90EDI3Rjn8vLm6Othl/ X-Received: by 2002:a62:5a01:: with SMTP id o1-v6mr31304253pfb.0.1537278292904; Tue, 18 Sep 2018 06:44:52 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1537278292; cv=none; d=google.com; s=arc-20160816; b=F6U00q5CNhnjjhk9DEw5qcLlXaeTOitkeEhhU6xDHqQrCeyQ5SrIZE0itt6pkkaQ/D xuV5EARlhAOeI+9ZOY89mGZS9M7otbyZO3pgfCXJakmO7AbUGO1Gdyhu1kN4Lb/sOT/y UPUW2LGBOhbvDxnSA26w1wF001B6RR/RolYLlnivfZBNU8xPiRRx5bacWOAbCow3jm1N 6OcgeLaNWua+zvJX1fI3/E4if/jWaQHtywgGEFefdknF2FzJQ5wj/KHlt9G1qPw+XgzT fDnO8x9t5pdgkO0yVnK9SeR7QN2wrmOpU+vBBHWCT5hkHxXv00SXdTMlnp/bpew1TjP3 /1MA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-transfer-encoding:content-disposition:mime-version :references:message-id:subject:cc:to:from:date:dkim-signature; bh=un2oZt/A9xE4GNb1l+xXgkrBkW4XBT2tlo/fYYXlJS0=; b=ZX4RYHsDGzgkPzgHUDGqjHk9cHnAs89aGIJ5AyMKVkuZGsi9ps52WGI2IlOdbp2Hhs 1wYE9gPxNJnCZLHfRx1KHuK1ntSdkH6OyzMd2oD90mp2HH0H5gscQ2FBssWHv5ib0+3T nipW7r2A0r6GfvNknwbcWBo5SVozS2HYKgBgVm/e2tZwgXc2F8VWDDWBXpAIxOTISfea 6EBpnAvc1x+U1i7G4GSLVQPihVtAaBuI/AD2TGrnGaFEQhpXnaS/IBUkv02L7/hRjM2L n09jzhq5RTsK4V9XSc2aHMjIsB/UGPSeqAbsghsWZnUoacAVbSMgpcaIympoxdeIMLg/ zgnA== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b="Oy/J3kUx"; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id p2-v6si18661693plk.247.2018.09.18.06.44.22; Tue, 18 Sep 2018 06:44:52 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b="Oy/J3kUx"; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729833AbeIRTPF (ORCPT + 99 others); Tue, 18 Sep 2018 15:15:05 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:58046 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727207AbeIRTPF (ORCPT ); Tue, 18 Sep 2018 15:15:05 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Transfer-Encoding :Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=un2oZt/A9xE4GNb1l+xXgkrBkW4XBT2tlo/fYYXlJS0=; b=Oy/J3kUxadyxKx1BZ7P1xV+Elr 5fZ1wBPwN/ghOHzk1Y/7RKG94Xx1KLgcZuAPNVncXipzbHo7+yAFoEeJvijgGS6BhmiuY40VuuvSK xFLaG2NP5fy14LnL24WETazJm6VfVkFF03rbF8YlgPTgpTan3Ck8H5lnCLTxNapNVlqAqnjcHVek3 bgmV7bU70A4UTO9g3JUda0I7ZB3wvc5Xdxt2i19LEvUNE+/e+Mm6xCdkFCQGkK7aV2EqqZzYpvlkI lcgNKvkySdMpfUI4knxUnTx6uEMulaKOmjrCm6OpnVyeGQkCdk3vnMhYOPz1lYpxLc0H9RgEmBQUH PX+BJFiQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1g2GGd-00032c-3e; Tue, 18 Sep 2018 13:42:15 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 90270202C1A2E; Tue, 18 Sep 2018 15:42:13 +0200 (CEST) Date: Tue, 18 Sep 2018 15:42:13 +0200 From: Peter Zijlstra To: Jan =?iso-8859-1?Q?H=2E_Sch=F6nherr?= Cc: Ingo Molnar , linux-kernel@vger.kernel.org, Paul Turner , Vincent Guittot , Morten Rasmussen , Tim Chen , Rik van Riel Subject: Re: Task group cleanups and optimizations (was: Re: [RFC 00/60] Coscheduling for Linux) Message-ID: <20180918134213.GV24124@hirez.programming.kicks-ass.net> References: <20180907214047.26914-1-jschoenh@amazon.de> <20180914111251.GC24106@hirez.programming.kicks-ass.net> <1d86f497-9fef-0b19-50d6-d46ef1c0bffa@amazon.de> <282230fe-b8de-01f9-c19b-6070717ba5f8@amazon.de> <20180917094844.GR24124@hirez.programming.kicks-ass.net> <08b930d9-7ffe-7df3-ab35-e7b58073e489@amazon.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <08b930d9-7ffe-7df3-ab35-e7b58073e489@amazon.de> User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Sep 18, 2018 at 03:22:13PM +0200, Jan H. Sch?nherr wrote: > to always restrict tasks in a task group to just one core/node/whatever. On an > SMT system, you would typically need at most two runqueues for a core; the memory You forget that SMT4 and SMT8 are fairly common outside of x86.