From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) by kanga.kvack.org (Postfix) with ESMTP id 3FE316B0007 for ; Mon, 5 Nov 2018 15:51:55 -0500 (EST) Received: by mail-wm1-f70.google.com with SMTP id y185-v6so7729419wmg.6 for ; Mon, 05 Nov 2018 12:51:55 -0800 (PST) Received: from merlin.infradead.org (merlin.infradead.org. [2001:8b0:10b:1231::1]) by mx.google.com with ESMTPS id u9-v6si35744701wrd.317.2018.11.05.12.51.53 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 05 Nov 2018 12:51:53 -0800 (PST) Subject: Re: [RFC PATCH v4 02/13] ktask: multithread CPU-intensive kernel work 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 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: owner-linux-mm@kvack.org List-ID: 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 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