linux-kernel - Re: [BUG] cpu-hotplug: Can't offline the CPU with naughty realtime processes

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Message-ID: <20070509085611.GA4431@in.ibm.com>
Date:	Wed, 9 May 2007 14:26:12 +0530
From:	Gautham R Shenoy <ego@...ibm.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Satoru Takeuchi <takeuchi_satoru@...fujitsu.com>, vatsa@...ibm.com,
	Rusty Russell <rusty@...tcorp.com.au>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	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>,
	Ingo Molnar <mingo@...e.hu>, paulmck@...ibm.com
Subject: Re: [BUG] cpu-hotplug: Can't offline the CPU with naughty	realtime processes

On Wed, May 09, 2007 at 10:47:50AM +1000, Nick Piggin wrote:
> 
> We've seen the same problem with other stop_machine_run sites in the kernel.
> module remove was one.
> 
> Reserving the top priority slot for stop machine (and migration thread, I
> guess) isn't a bad idea.

I second this thought.
The process freezer, if used will only safeguard cpu-hotplug, but not other
sites which use stop_machine_run.

> 
> -- 
> SUSE Labs, Novell Inc.

Regards
gautham.
-- 
Gautham R Shenoy
Linux Technology Center
IBM India.
"Freedom comes with a price tag of responsibility, which is still a bargain,
because Freedom is priceless!"
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