linux-kernel - Re: [RFD PATCH 0/4] cpu: Bulk CPU Hotplug support.

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Date:	Wed, 17 Jun 2009 06:50:28 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Gautham R Shenoy <ego@...ibm.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Balbir Singh <balbir@...ibm.com>,
	Rusty Russel <rusty@...tcorp.com.au>,
	Paul E McKenney <paulmck@...ibm.com>,
	Nathan Lynch <ntl@...ox.com>, Ingo Molnar <mingo@...e.hu>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Shoahua Li <shaohua.li@...ux.com>
Subject: Re: [RFD PATCH 0/4] cpu: Bulk CPU Hotplug support.

On Mon, 2009-06-15 at 22:38 -0700, Gautham R Shenoy wrote:
> So, of the accounted time, a major chunk of time is consumed by
> cpuset_track_online_cpus() while handling CPU_DEAD and CPU_ONLINE
> notifications.
> 
>         11.320205 ms: cpuset_track_online_cpus      : CPU_DEAD
>         12.767882 ms: cpuset_track_online_cpus      : CPU_ONLINE
> 
> cpuset_trace_online_cpus() among other things performs the task of rebuilding
> the sched_domains for every online CPU in the system.

Are the above numbers with CONFIG_SCHED_DEBUG turned on/off?

thanks,
suresh

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