From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754338AbcB2UYd (ORCPT ); Mon, 29 Feb 2016 15:24:33 -0500 Received: from shards.monkeyblade.net ([149.20.54.216]:50625 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750973AbcB2UYc (ORCPT ); Mon, 29 Feb 2016 15:24:32 -0500 Date: Mon, 29 Feb 2016 15:24:27 -0500 (EST) Message-Id: <20160229.152427.1590219093309278129.davem@davemloft.net> To: tglx@linutronix.de Cc: peter@hurleysoftware.com, eric.dumazet@gmail.com, umgwanakikbuti@gmail.com, romieu@fr.zoreil.com, edumazet@google.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org, dmaengine@vger.kernel.org, john.ogness@linutronix.de, bigeasy@linutronix.de, akpm@linux-foundation.org Subject: Re: Softirq priority inversion from "softirq: reduce latencies" From: David Miller In-Reply-To: References: <1456770279.648.85.camel@edumazet-ThinkPad-T530> <56D493A5.403@hurleysoftware.com> X-Mailer: Mew version 6.6 on Emacs 24.5 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Mon, 29 Feb 2016 12:24:31 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Thomas Gleixner Date: Mon, 29 Feb 2016 20:14:36 +0100 (CET) > On Mon, 29 Feb 2016, Peter Hurley wrote: >> Or flipping your argument on its head, why not just _always_ execute >> softirq in ksoftirqd? > > Which is what that change effectivley does. And that makes a lot of sense, > because you get the softirq load under scheduler control and do not let the > softirq run as a context stealing entity which is completely uncontrollable by > the scheduler. +1