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 X-Spam-Level: X-Spam-Status: No, score=-2.1 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 59FFEECE564 for ; Tue, 18 Sep 2018 13:42:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 117362146D for ; Tue, 18 Sep 2018 13:42:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Oy/J3kUx" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 117362146D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729843AbeIRTPF (ORCPT ); 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. Schönherr 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.