From mboxrd@z Thu Jan  1 00:00:00 1970
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [RFC][PATCH 0/9] File descriptor hot-unplug support
Date: Sat, 11 Apr 2009 17:56:51 +0100
Message-ID: <20090411165651.GW26366@ZenIV.linux.org.uk>
References: <m1skkf761y.fsf@fess.ebiederm.org> <20090411155852.GV26366@ZenIV.linux.org.uk> <m1k55ryw2n.fsf@fess.ebiederm.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
	linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
	Hugh Dickins <hugh@veritas.com>, Tejun Heo <tj@kernel.org>,
	Alexey Dobriyan <adobriyan@gmail.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Greg Kroah-Hartman <gregkh@suse.de>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Return-path: <linux-pci-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <m1k55ryw2n.fsf@fess.ebiederm.org>
Sender: linux-pci-owner@vger.kernel.org
List-Id: linux-fsdevel.vger.kernel.org

On Sat, Apr 11, 2009 at 09:49:36AM -0700, Eric W. Biederman wrote:

> The fact that in the common case only one task ever accesses a struct
> file leaves a lot of room for optimization.

I'm not at all sure that it's a good assumption; even leaving aside e.g.
several tasks sharing stdout/stderr, a bunch of datagrams coming out of
several threads over the same socket is quite possible.