linux-kernel - Re: [PATCH 00/11] [GIT PULL] more updates for the tag format

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Message-ID: <20090611130318.GB14220@infradead.org>
Date:	Thu, 11 Jun 2009 09:03:18 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Theodore Tso <tytso@....edu>, Steven Rostedt <rostedt@...dmis.org>,
	Fr?d?ric Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Mel Gorman <mel@....ul.ie>,
	Christoph Hellwig <hch@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Peter Zijlstra <peterz@...radead.org>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Zhaolei <zhaolei@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jason Baron <jbaron@...hat.com>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Subject: Re: [PATCH 00/11] [GIT PULL] more updates for the tag format

On Wed, Jun 10, 2009 at 12:03:03PM -0400, Theodore Tso wrote:
> Yes, another approach for handling this case would be to take my
> "jbd2_dev_to_name" function and support it as a first-class tagged
> type; after all, I'm sure ext4 won't be the only place that would like
> to take a dev_t and print the device name.  So this could certainly be
> fixed by adding some kind of "<dev:xxx>" sort of tagged name.

We should absolutely agree on one way to represent block device for
tracers.  At this point xfs, gfs2 and the block tracer all use
major/minor.  I agree that having a name would be nicer for text output,
but I really want to keep the dev_t for the binary output.  We should
also make sure we agree on a field name so that filtering will work
the same for all block-related tracers (especially important if we want
to trace something from the filesystem down to the block layer).

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