linux-kernel - Re: spinlock contention of files->file

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Message-ID: <20131001220453.GY13318@ZenIV.linux.org.uk>
Date:	Tue, 1 Oct 2013 23:04:53 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Waiman Long <Waiman.Long@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: spinlock contention of files->file_lock

On Tue, Oct 01, 2013 at 02:41:58PM -0700, Eric Dumazet wrote:
> Maybe I am missing something obvious ?

Yes.  do_execve_common() starts with unshare_files(); there can be
no other thread capable of modifying that descriptor table.
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