From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752202AbaE0NUS (ORCPT ); Tue, 27 May 2014 09:20:18 -0400 Received: from mail-wi0-f178.google.com ([209.85.212.178]:59667 "EHLO mail-wi0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751941AbaE0NUO (ORCPT ); Tue, 27 May 2014 09:20:14 -0400 Message-ID: <1401196807.5134.132.camel@marge.simpson.net> Subject: Re: balance storm From: Mike Galbraith To: Libo Chen Cc: tglx@linutronix.de, mingo@elte.hu, LKML , Greg KH , Li Zefan , peterz@infradead.org Date: Tue, 27 May 2014 15:20:07 +0200 In-Reply-To: <53848A2C.5010209@huawei.com> References: <5382AF2E.1040407@huawei.com> <1401081082.5339.41.camel@marge.simpson.net> <538330B7.5070503@huawei.com> <1401113960.23186.41.camel@marge.simpson.net> <53844510.1040502@huawei.com> <1401184553.5134.115.camel@marge.simpson.net> <53848A2C.5010209@huawei.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2014-05-27 at 20:50 +0800, Libo Chen wrote: > in my box: > > perf top -g --sort=symbol > > Events: 3K cycles > 73.27% [k] read_hpet > 4.30% [k] _raw_spin_lock_irqsave > 1.88% [k] __schedule > 1.00% [k] idle_cpu > 0.91% [k] native_write_msr_safe > 0.68% [k] select_task_rq_fair > 0.51% [k] module_get_kallsym > 0.49% [.] sem_post > 0.44% [.] main > 0.41% [k] menu_select > 0.39% [k] _raw_spin_lock > 0.38% [k] __switch_to > 0.33% [k] _raw_spin_lock_irq > 0.32% [k] format_decode > 0.29% [.] usleep > 0.28% [.] symbols__insert > 0.27% [k] tick_nohz_stop_sched_tick > 0.27% [k] update_stats_wait_end > 0.26% [k] apic_timer_interrupt > 0.25% [k] enqueue_entity > 0.25% [k] sched_clock_local > 0.24% [k] _raw_spin_unlock_irqrestore > 0.24% [k] select_idle_sibling read_hpet? Are you booting box notsc or something? Migration cost is the least of your worries. -Mike