linux-kernel - Re: balance storm

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Message-ID: <1401196807.5134.132.camel@marge.simpson.net>
Date:	Tue, 27 May 2014 15:20:07 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Libo Chen <libo.chen@...wei.com>
Cc:	tglx@...utronix.de, mingo@...e.hu,
	LKML <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Li Zefan <lizefan@...wei.com>, peterz@...radead.org
Subject: Re: balance storm

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

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