From: Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 2/3] Remove BKL from fs/locks.c
Date: Sun, 11 Jul 2010 00:01:10 +0200
Message-ID: <20100710220110.GA13380@lst.de>
References: <1278798701-11171-1-git-send-email-arnd@arndb.de> <1278798701-11171-3-git-send-email-arnd@arndb.de>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: linux-kernel@vger.kernel.org, John Kacur <jkacur@redhat.com>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Matthew Wilcox <willy@linux.intel.com>,
	Christoph Hellwig <hch@lst.de>,
	Trond Myklebust <trond.myklebust@fys.uio.no>,
	"J. Bruce Fields" <bfields@fieldses.org>,
	Miklos Szeredi <mszeredi@suse.cz>,
	Ingo Molnar <mingo@redhat.com>, linux-fsdevel@vger.kernel.org
To: Arnd Bergmann <arnd@arndb.de>
Return-path: <linux-kernel-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <1278798701-11171-3-git-send-email-arnd@arndb.de>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: linux-fsdevel.vger.kernel.org

On Sat, Jul 10, 2010 at 11:51:40PM +0200, Arnd Bergmann wrote:
> From: Matthew Wilcox <willy@linux.intel.com>
> 
> I've taken a patch originally written by Matthew Wilcox and
> ported it to the current version. Unfortunately, the change
> conflicts with the use of lockd, which still heavily uses
> the big kernel lock.
> 
> As a workaround, I've made the behaviour configurable,
> it either uses the BKL when it's enabled or a spinlock
> when the BKL (and consequently nfs and lockd) are
> disabled.

Defintively not something we want in mainline.  But keep poking
the nfs guys to sort the lockd mess out for real.