linux-kernel - Re: [RFC] ps command race fix

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Message-Id: <20060725113446.09eda7bb.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 25 Jul 2006 11:34:46 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	linux-kernel@...r.kernel.org, ebiederm@...ssion.com
Subject: Re: [RFC] ps command race fix

On Mon, 24 Jul 2006 19:06:26 -0700
Andrew Morton <akpm@...l.org> wrote:
> > but it was not very good because 
> > proc_pid_readdir() has to traverse all pids, not tgids.
> 
> You mean "all tgids, not pids".
> 
Ah, sorry. Precisely, traverse all pids and choose tgids from them because
pid_hash[] remembers all pids.


> > So, I had to access
> > task_struct of the pid. I wanted to avoid to access task struct itself,
> 
> Why do you wish to avoid accessing the task_struct?
> 
I thought accessing all task struct at random is heavy work and have to
up and down rcu_read_lock thousands of times.
I'm sorry if my thought is not problem.

Thanks,
-Kame

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