linux-kernel - Re: [BUG] CPU hotplug: system hang on CPU hot remove during oprofile

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Date:	Mon, 28 May 2007 10:12:24 +0100
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Satoru Takeuchi <takeuchi_satoru@...fujitsu.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Nathan Lynch <nathanl@...tin.ibm.com>,
	Joel Schopp <jschopp@...tin.ibm.com>,
	Ashok Raj <ashok.raj@...el.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>
Subject: Re: [BUG] CPU hotplug: system hang on CPU hot remove during oprofile

On Mon, May 28, 2007 at 01:53:30PM +0900, Satoru Takeuchi wrote:
> I found a bug on CPU hotplug. If oprofile is running, CPU hot remove causes
> system hang. I only confirm that this problem occurs on my ia64 box. I'm glad
> if someone report about other arch.

oprofile is not CPU hotplug safe.  (It should probably be made so,
but I think that would require a redesign, or at least a rewrite of
the backends.)

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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