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

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Message-ID: <20090616163352.GA6005@in.ibm.com>
Date:	Tue, 16 Jun 2009 22:03:52 +0530
From:	Gautham R Shenoy <ego@...ibm.com>
To:	Nathan Lynch <ntl@...ox.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.

On Tue, Jun 16, 2009 at 11:22:56AM -0500, Nathan Lynch wrote:
> 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...

No, they aren't intended to be in the final result.

-- 
Thanks and Regards
gautham
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