Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932740AbaJUNjg (ORCPT ); Tue, 21 Oct 2014 09:39:36 -0400 Received: from mail-pa0-f44.google.com ([209.85.220.44]:33948 "EHLO mail-pa0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932509AbaJUNje (ORCPT ); Tue, 21 Oct 2014 09:39:34 -0400 Message-ID: <5446620E.4020700@gmail.com> Date: Tue, 21 Oct 2014 21:39:26 +0800 From: Wanpeng Li User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Juri Lelli , Wanpeng Li , Ingo Molnar , Peter Zijlstra CC: "linux-kernel@vger.kernel.org" Subject: Re: [PATCH 2/2] sched/deadline: don't need to balance during wakeup if wakee is pinned References: <1413253360-5318-1-git-send-email-wanpeng.li@linux.intel.com> <1413253360-5318-2-git-send-email-wanpeng.li@linux.intel.com> <54464F59.3000100@gmail.com> <54465FB6.1060800@arm.com> In-Reply-To: <54465FB6.1060800@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Juri, 于 10/21/14, 9:29 PM, Juri Lelli 写道: > Hi, > > On 21/10/14 13:19, Wanpeng Li wrote: >> Cc Juri, >> >> 于 10/14/14, 10:22 AM, Wanpeng Li 写道: >>> Use nr_cpus_allowed to bail from select_task_rq() when only one cpu >>> can be used, and saves some cycles for pinned tasks. >>> >>> Signed-off-by: Wanpeng Li >>> --- >>> kernel/sched/deadline.c | 3 +++ >>> 1 file changed, 3 insertions(+) >>> >>> diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c >>> index f46b7f1..5874bf8 100644 >>> --- a/kernel/sched/deadline.c >>> +++ b/kernel/sched/deadline.c >>> @@ -914,6 +914,9 @@ select_task_rq_dl(struct task_struct *p, int cpu, int sd_flag, int flags) >>> struct task_struct *curr; >>> struct rq *rq; >>> >>> + if (p->nr_cpus_allowed == 1) >>> + goto out; >>> + >>> if (sd_flag != SD_BALANCE_WAKE) >>> goto out; >>> > Apart from the encoding of the resend, it looks good, thanks! What's your meaning of resend? Do you mean this one? https://lkml.org/lkml/2014/10/10/425 I'm afraid they are different patches. Regards, Wanpeng Li > > Best, > > - Juri > -- 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/