From: Andrew Morton <akpm@linux-foundation.org>
To: Gautham R Shenoy <ego@in.ibm.com>
Cc: 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>,
Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>,
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
Dipankar Sarma <dipankar@in.ibm.com>,
Shoahua Li <shaohua.li@linux.com>
Subject: Re: [RFD PATCH 0/4] cpu: Bulk CPU Hotplug support.
Date: Mon, 15 Jun 2009 23:23:18 -0700 [thread overview]
Message-ID: <20090615232318.74b099a6.akpm@linux-foundation.org> (raw)
In-Reply-To: <20090616053431.30891.18682.stgit@sofia.in.ibm.com>
On Tue, 16 Jun 2009 11:08:39 +0530 Gautham R Shenoy <ego@in.ibm.com> wrote:
> Currently on a ppc64 box with 16 CPUs, the time taken for
> a individual cpu-hotplug operation is as follows.
>
> # time echo 0 > /sys/devices/system/cpu/cpu2/online
> real 0m0.025s
> user 0m0.000s
> sys 0m0.002s
>
> # time echo 1 > /sys/devices/system/cpu/cpu2/online
> real 0m0.021s
> user 0m0.000s
> sys 0m0.000s
Surprised. Do people really online and offline CPUs frequently enough
for this to be a problem?
next prev parent reply other threads:[~2009-06-16 6:24 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-16 5:38 [RFD PATCH 0/4] cpu: Bulk CPU Hotplug support Gautham R Shenoy
2009-06-16 5:38 ` [RFD PATCH 1/4] powerpc: cpu: Reduce the polling interval in __cpu_up() Gautham R Shenoy
2009-06-16 16:06 ` Nathan Lynch
2009-06-16 16:37 ` Gautham R Shenoy
2009-06-16 5:38 ` [RFD PATCH 2/4] cpu: sysfs interface for hotplugging bunch of CPUs Gautham R Shenoy
2009-06-16 16:22 ` Nathan Lynch
2009-06-16 16:33 ` Gautham R Shenoy
2009-06-16 5:38 ` [RFD PATCH 3/4] cpu: Define new functions cpu_down_mask and cpu_up_mask Gautham R Shenoy
2009-06-16 5:38 ` [RFD PATCH 4/4] cpu: measure time taken by subsystem notifiers during cpu-hotplug Gautham R Shenoy
2009-06-16 6:23 ` Andrew Morton [this message]
2009-06-16 8:07 ` [RFD PATCH 0/4] cpu: Bulk CPU Hotplug support Vaidyanathan Srinivasan
2009-06-16 21:00 ` Paul E. McKenney
2009-06-24 15:02 ` Pavel Machek
2009-06-17 7:32 ` Peter Zijlstra
2009-06-17 7:40 ` Balbir Singh
2009-06-17 14:38 ` Paul E. McKenney
2009-06-17 15:07 ` Ingo Molnar
2009-06-17 20:26 ` Peter Zijlstra
2009-06-20 15:35 ` Ingo Molnar
2009-06-22 6:08 ` Nathan Lynch
2009-06-17 13:50 ` Suresh Siddha
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