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=-3.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_PASS 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 D1C85C0044C for ; Mon, 5 Nov 2018 20:51:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8D23D2085A for ; Mon, 5 Nov 2018 20:51:55 +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="DegN4F0U" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8D23D2085A 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 S2387641AbeKFGNY (ORCPT ); Tue, 6 Nov 2018 01:13:24 -0500 Received: from merlin.infradead.org ([205.233.59.134]:44748 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726902AbeKFGNY (ORCPT ); Tue, 6 Nov 2018 01:13:24 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To:Subject: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=EX65ZqpYm5TG7BdnK2QxcpseC01FJqY+W5b4z8PLEZw=; b=DegN4F0UCijvUMdTai7btmPpC/ mV/f4hk0M+gON1xBfoHYzkrcbmri/vIW8lIorwCXvrDr3E3RzcvUhBxKyozGiMjD+p/5vqOUNsk7x W8iyibQ2aDBFp/McLCOx72Tj8pRJvhqoiL2xz1r9nB2aPfXLk0q5EEyqJK+m4mAOgXi2EgNMfVNEo U3CaK71bNObpjGcjJ4MRR5rwZ4cH0zU1LlmAhoA+emZgQHFtgmanFHWOCYjUYZkoth29ZpLJGVVn6 nJVmhdu45lLKCN+cPxUhT1HwzCKqJuJ+PcaBoT2zQATkVgT4ogiBxZ6E6+hIETkx78IhmS4GfPO5I Jfle7LNw==; Received: from static-50-53-52-16.bvtn.or.frontiernet.net ([50.53.52.16] helo=midway.dunlab) by merlin.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1gJlqS-0000rr-AY; Mon, 05 Nov 2018 20:51:36 +0000 Subject: Re: [RFC PATCH v4 02/13] ktask: multithread CPU-intensive kernel work To: Daniel Jordan , linux-mm@kvack.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: aarcange@redhat.com, aaron.lu@intel.com, akpm@linux-foundation.org, alex.williamson@redhat.com, bsd@redhat.com, darrick.wong@oracle.com, dave.hansen@linux.intel.com, jgg@mellanox.com, jwadams@google.com, jiangshanlai@gmail.com, mhocko@kernel.org, mike.kravetz@oracle.com, Pavel.Tatashin@microsoft.com, prasad.singamsetty@oracle.com, steven.sistare@oracle.com, tim.c.chen@intel.com, tj@kernel.org, vbabka@suse.cz References: <20181105165558.11698-1-daniel.m.jordan@oracle.com> <20181105165558.11698-3-daniel.m.jordan@oracle.com> From: Randy Dunlap Message-ID: <736b23a4-cb32-7926-101a-9b6555e59b5e@infradead.org> Date: Mon, 5 Nov 2018 12:51:33 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: <20181105165558.11698-3-daniel.m.jordan@oracle.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/5/18 8:55 AM, Daniel Jordan wrote: > diff --git a/init/Kconfig b/init/Kconfig > index 41583f468cb4..ed82f76ed0b7 100644 > --- a/init/Kconfig > +++ b/init/Kconfig > @@ -346,6 +346,17 @@ config AUDIT_TREE > depends on AUDITSYSCALL > select FSNOTIFY > > +config KTASK > + bool "Multithread CPU-intensive kernel work" > + depends on SMP > + default y > + help > + Parallelize CPU-intensive kernel work. This feature is designed for > + big machines that can take advantage of their extra CPUs to speed up > + large kernel tasks. When enabled, kworker threads may occupy more > + CPU time during these kernel tasks, but these threads are throttled > + when other tasks on the system need CPU time. Use tab + 2 spaces consistently for help text indentation, please. > + > source "kernel/irq/Kconfig" > source "kernel/time/Kconfig" > source "kernel/Kconfig.preempt" -- ~Randy