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

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Message-ID: <alpine.DEB.1.10.0902031508280.23050@alien.or.mcafeemobile.com>
Date:	Tue, 3 Feb 2009 15:09:36 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Jonathan Corbet <corbet@....net>, mpm@...enic.com,
	dada1@...mosbay.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	andi@...stfloor.org, oleg@...hat.com, viro@...IV.linux.org.uk,
	Davide Libenzi <davidel@...ilserver.org>,
	David Miller <davem@...emloft.net>, hch@....de,
	linux-api@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH 2/4] Convert epoll to a bitlock

On Tue, 3 Feb 2009, Andrew Morton wrote:

> Well.  We _could_ whack part of this nut with my usual hammer: protect
> f_flags with file->f_dentry->d_inode->i_lock.  IIRC there was some
> objection to that - performance?

If you meant it for epoll, that uses a single shared inode, that'd turn to 
be a global lock.


- Davide


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