linux-kernel - Re: [rfc 2/3] fs, proc: Introduce the Children: line in /proc/<pid>/status

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Message-ID: <20111201213836.GB14515@moon>
Date:	Fri, 2 Dec 2011 01:38:36 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Andrew Vagin <avagin@...nvz.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Vasiliy Kulikov <segoon@...nwall.com>
Subject: Re: [rfc 2/3] fs, proc: Introduce the Children: line in
 /proc/<pid>/status

On Thu, Dec 01, 2011 at 01:29:11PM -0800, Andrew Morton wrote:
> 
> That's a potentially very long hold time for tasklist_lock, and
> userspace can invoke this at a high frequency.  Not good.
> 
> I think this can all be done under rcu_read_lock() with
> list_for_each_entry_rcu().
> 

Yeah, good point, thanks Andrew!

	Cyrill
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