linux-kernel - Re: FW: Linux question

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Message-ID: <20080307191343.GB4703@bleen.domain.actdsltmp>
Date:	Fri, 7 Mar 2008 12:13:43 -0700
From:	Justin Banks <justinb@...bone.com>
To:	Bill Davidsen <davidsen@....com>
Cc:	Justin Banks <justinb@...bone.com>,
	"Miller, Mike (OS Dev)" <Mike.Miller@...com>,
	linux-kernel@...r.kernel.org
Subject: Re: FW: Linux question

Bill Davidsen wrote
> Justin Banks wrote:
> > Miller, Mike (OS Dev) wrote
> >> Is there a way in to limit the kernel to seeing only the cores on a
> >> single processor and ignore all other processor cores (eg. leave
> >> them in HALT)?
> > 
> > Can't you just echo 0 into /sys/devices/system/cpu/cpuN/online where the
> > /sys/devices/system/cpu/cpuN/topology/physical_package_id isn't the one
> > you want to keep online?
> > 
> Here's an interesting question, why isn't there an "online" file for 
> each CPU?

I've noticed that as well, and I'm not sure. IIRC, on some systems I've
seen there's an online file for every CPU, but on my laptop (2.6.22
Intel Mac) there isn't one for cpu0, just as in your example.

-justinb

-- 
Justin Banks
BakBone Software
justinb@...bone.com
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