linux-kernel - Re: [RFC PATCH 1/21] relay - Clean up relay_switch_subbuf() and make waking up consumers optional.

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Message-ID: <48F9A441.3030400@cs.helsinki.fi>
Date:	Sat, 18 Oct 2008 11:54:25 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Tom Zanussi <zanussi@...cast.net>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Martin Bligh <mbligh@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	prasad@...ux.vnet.ibm.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Steven Rostedt <rostedt@...dmis.org>, od@...e.com,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, hch@....de,
	David Wilder <dwilder@...ibm.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Subject: Re: [RFC PATCH 1/21] relay - Clean up relay_switch_subbuf() and make
 waking up consumers optional.

Hi Tom,

Tom Zanussi wrote:
> +static inline void relay_update_filesize(struct rchan_buf *buf, size_t length)
> +{
> +	if (buf->dentry)
> +		buf->dentry->d_inode->i_size +=	length;
> +	else
> +		buf->early_bytes += length;
> +
> +	smp_mb();
> +}

A minor nit: you should probably add a comment for that memory barrier. 
That is, explain why it is needed. It makes a world of a difference to 
anyone trying to understand what's going on here.
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