Subject: Re: [RFD PATCH 0/4] cpu: Bulk CPU Hotplug support.
From: Suresh Siddha <suresh.b.siddha@intel.com>
Reply-To: suresh.b.siddha@intel.com
To: Gautham R Shenoy <ego@in.ibm.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Balbir Singh <balbir@in.ibm.com>, Rusty Russel <rusty@rustcorp.com.au>,
       Paul E McKenney <paulmck@us.ibm.com>, Nathan Lynch <ntl@pobox.com>,
       Ingo Molnar <mingo@elte.hu>,
       "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
       Dipankar Sarma <dipankar@in.ibm.com>, Shoahua Li <shaohua.li@linux.com>
In-Reply-To: <20090616053431.30891.18682.stgit@sofia.in.ibm.com>
References: <20090616053431.30891.18682.stgit@sofia.in.ibm.com>
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Organization: Intel Corp
Date: Wed, 17 Jun 2009 06:50:28 -0700
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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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