linux-kernel - Re: [RFC/PATCH 2/8] revoke: inode revoke lock V7

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Message-ID: <2605.1197995509@vena.lwn.net>
Date:	Tue, 18 Dec 2007 09:31:49 -0700
From:	corbet@....net (Jonathan Corbet)
To:	Pekka J Enberg <penberg@...helsinki.fi>
Cc:	alan@...hat.com, viro@...iv.linux.org.uk, hch@...radead.org,
	peterz@...radead.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [RFC/PATCH 2/8] revoke: inode revoke lock V7 

This is a relatively minor detail in the rather bigger context of this
patch, but...

> @@ -642,6 +644,7 @@ struct inode {
>  	struct list_head	inotify_watches; /* watches on this inode */
>  	struct mutex		inotify_mutex;	/* protects the watches list */
>  #endif
> +	wait_queue_head_t	i_revoke_wait;

That seems like a relatively hefty addition to every inode in the system
when revoke - I think - will be a fairly rare operation.  Would there be
any significant cost to using a single, global revoke-wait queue instead
of growing the inode structure?

jon
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