Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751636Ab0LXH7L (ORCPT ); Fri, 24 Dec 2010 02:59:11 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:64433 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1750978Ab0LXH7K (ORCPT ); Fri, 24 Dec 2010 02:59:10 -0500 Message-ID: <4D145339.1080205@cn.fujitsu.com> Date: Fri, 24 Dec 2010 16:00:57 +0800 From: Lai Jiangshan User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9) Gecko/20100423 Thunderbird/3.0.4 MIME-Version: 1.0 To: Frederic Weisbecker CC: LKML , Thomas Gleixner , Peter Zijlstra , "Paul E. McKenney" , Ingo Molnar , Steven Rostedt , Andrew Morton , Anton Blanchard , Tim Pepper Subject: Re: [RFC PATCH 01/15] nohz_task: New mask for cpus having nohz task References: <1292858662-5650-1-git-send-email-fweisbec@gmail.com> <1292858662-5650-2-git-send-email-fweisbec@gmail.com> In-Reply-To: <1292858662-5650-2-git-send-email-fweisbec@gmail.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2010-12-24 15:58:58, Serialize by Router on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2010-12-24 15:58:59, Serialize complete at 2010-12-24 15:58:59 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 627 Lines: 17 On 12/20/2010 11:24 PM, Frederic Weisbecker wrote: > > +config NO_HZ_TASK > + bool "Tickless task" > + depends on HAVE_NO_HZ_TASK && NO_HZ && SMP && HIGH_RES_TIMERS > + help > + When a task runs alone on a CPU and switches into this mode, > + the timer interrupt will only trigger when it is strictly > + needed. Why it depends on SMP? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/