linux-kernel - Re: [PATCH 2/4] Convert epoll to a bitlock

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Message-Id: <20090203133942.2ecec281.akpm@linux-foundation.org>
Date:	Tue, 3 Feb 2009 13:39:42 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jonathan Corbet <corbet@....net>
Cc:	linux-kernel@...r.kernel.org, andi@...stfloor.org, oleg@...hat.com,
	viro@...IV.linux.org.uk, davidel@...ilserver.org,
	davem@...emloft.net, hch@....de, linux-api@...r.kernel.org,
	mpm@...enic.com, alan@...rguk.ukuu.org.uk, corbet@....net
Subject: Re: [PATCH 2/4] Convert epoll to a bitlock

On Mon,  2 Feb 2009 11:20:09 -0700
Jonathan Corbet <corbet@....net> wrote:

> Matt Mackall suggested converting epoll's ep_lock to a bitlock as a way of
> saving space in struct file.  This patch makes that change.

hrm.  bit_spin_lock() makes people upset (large penguiny people).  iirc
it doesn't have all the correct/well-understood memory/compiler
ordering semantics which spinlocks have.  And lockdep doesn't know about
it.

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