linux-kernel - Re: [PATCH, RFC] fasync() BKL pushdown

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Message-ID: <485BEEF7.2020404@firstfloor.org>
Date:	Fri, 20 Jun 2008 19:55:03 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Jonathan Corbet <corbet@....net>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [PATCH, RFC] fasync() BKL pushdown

Jonathan Corbet wrote:

> The majority of fasync() functions just call fasync_helper() with a pointer
> to an fasync_struct reachable from the file structure.  Given that (1) the
> struct file will not go away while fasync() is running, and (2) the
> VFS-level fasync() stuff is protected with the Big Fasync Lock, I contend
> that these simple implementations have no need for the BKL.  

Not necessarily true, they might require BKL still for fd live time issues.

-Andi

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