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

[Andrew Morton]

On Tue, 16 Jun 2009 11:08:39 +0530 Gautham R Shenoy <ego@xxxxxxxxxx> 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?

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