linux-kernel - Re: [PATCH 0/4] v6 Improve task->comm locking situation

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Message-Id: <20110518000527.bcced636.akpm@linux-foundation.org>
Date:	Wed, 18 May 2011 00:05:27 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	John Stultz <john.stultz@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Joe Perches <joe@...ches.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Andy Whitcroft <apw@...onical.com>,
	Jiri Slaby <jirislaby@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 0/4] v6 Improve task->comm locking situation

On Wed, 18 May 2011 08:25:54 +0200 Ingo Molnar <mingo@...e.hu> wrote:

>   " Hey, this looks a bit racy and 'top' very rarely, on rare workloads that 
>     play with ->comm[], might display a weird reading task name for a second, 
>     amongst the many other temporarily nonsensical statistical things it 
>     already prints every now and then. "

Well we should at least make sure that `top' won't run off the end of
comm[] and go oops.  I think that's guaranteed by the fact(s) that
init_tasks's comm[15] is zero and is always copied-by-value across
fork and can never be overwritten in any task_struct.

But I didn't check that.

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