linux-kernel - Re: [RFC] Cpu-hotplug: Using the Process Freezer (try2)

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Message-ID: <20070403141516.GB14900@in.ibm.com>
Date:	Tue, 3 Apr 2007 19:45:16 +0530
From:	Gautham R Shenoy <ego@...ibm.com>
To:	Srivatsa Vaddagiri <vatsa@...ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, akpm@...ux-foundation.org,
	paulmck@...ibm.com, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...sign.ru>,
	"Rafael J. Wysocki" <rjw@...k.pl>, dipankar@...ibm.com,
	dino@...ibm.com, masami.hiramatsu.pt@...achi.com
Subject: Re: [RFC] Cpu-hotplug: Using the Process Freezer (try2)

On Tue, Apr 03, 2007 at 06:26:19PM +0530, Srivatsa Vaddagiri wrote:
> 
> Besides, how problematic is this in practise (that threads sleep for
> extended durations in TASK_INTERRUPTIBLE state breaking
> freezer/suspend/hotplug)?
> 
> Should we ignore this for the timebeing and take up later as and when
> users report problems?

In my case, the problem of freezer failing was due to the vfork freezer race
in do_fork. The parent task was waiting_for_completion() while the child was
frozen.

Rafael has already sent out the fix for that, but for some reason I
don't see it in the -mm.

With that fix, freezer and hence hotplug succeeds even when I am running
a 'make -j' test.

> 
> -- 
> Regards,
> vatsa

Thanks and 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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