linux-kernel - Re: [PATCH 0/3] v4 Improve task->comm locking situation

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Message-ID: <1305692109.2915.139.camel@work-vm>
Date:	Tue, 17 May 2011 21:15:09 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	tytso@....edu, mina86@...a86.com, jirislaby@...il.com,
	kosaki.motohiro@...fujitsu.com, rientjes@...gle.com,
	dave@...ux.vne, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] v4 Improve task->comm locking situation

On Wed, 2011-05-18 at 12:16 +0900, Tetsuo Handa wrote:
> What about replacing
> 	char comm[TASK_COMM_LEN];
> with
> 	char *rcu_commname;
> and switching it atomically using RCU?

So I think this approach is definitely worth trying. However, I think
converting to RCU will be much easier once we've first converted all
current comm users to making use of the get_task_comm accessor
functions. In this way my hope is my current proposal will serve as a
cleanup step before further optimizations can be done.

thanks
-john


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