linux-kernel - Re: [RFD PATCH 2/4] cpu: sysfs interface for hotplugging bunch of CPUs.

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Message-ID: <m3iqiwup0f.fsf@pobox.com>
Date:	Tue, 16 Jun 2009 11:22:56 -0500
From:	Nathan Lynch <ntl@...ox.com>
To:	Gautham R Shenoy <ego@...ibm.com>
Cc:	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>,
	Ingo Molnar <mingo@...e.hu>,
	Venkatesh Pallipadi <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 2/4] cpu: sysfs interface for hotplugging bunch of
 CPUs.

Gautham R Shenoy <ego@...ibm.com> writes:
> echo 2,3 > /sys/devices/system/cpu/offline #Offlines CPUs 2 and 3
> echo 4 > /sys/devices/sytem/cpu/offline    #Offlines CPU 4
> echo 2-4 > /sys/devices/system/cpu/online  #Onlines CPU 2,3,4
>
> This patch changes the permissions of these sysfs files from 0444 to 0644.
> It provides a dummy store function, which currently parses the input
> provided by the user and copies them to another debug cpumask structure,
> which can be accessed using the sysfs interfaces:
> 	/sys/devices/system/cpu/debug_offline
> and
> 	/sys/devices/system/cpu/debug_online
>
> Thus on performing a
> 	echo 2,3 > /sys/devices/system/cpu/offline
> the operation
> 	cat /sys/devices/system/cpu/debug_offline
> should yield
> 	2-3
> as the result.

These debug_(on|off)line attributes aren't intended to be in the final
result, are they?  They don't seem useful beyond the development phase
of this feature...
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