linux-kernel - Re: [PATCH 0/8] [GIT PULL] TRACE

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Message-ID: <20090416165224.GD5933@lst.de>
Date:	Thu, 16 Apr 2009 18:52:24 +0200
From:	Christoph Hellwig <hch@....de>
To:	Theodore Tso <tytso@....edu>, Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@....de>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Zhaolei <zhaolei@...fujitsu.com>, Li Zefan <lizf@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	"Frank Ch. Eigler" <fche@...stic.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Michael Rubin <mrubin@...gle.com>,
	Martin Bligh <mbligh@...gle.com>
Subject: Re: [PATCH 0/8] [GIT PULL] TRACE_EVENT for modules

On Tue, Apr 14, 2009 at 05:04:45PM -0400, Theodore Tso wrote:
> One thing which I would really like is to avoid needing to drop the
> header file in include/trace/<subsystem.h>.
> 
> The problem that I have with this is that for ext4, we need to access
> private data structures which are defined in header files in
> fs/ext4/*.h --- which we moved into fs/ext4 a long time ago at the
> request of those who felt include/linux/* was getting rather
> cluttered, and if a subsystem had header files which were only needed
> by files for that particular subsystems, they should be moved out of
> include/linux.  

Same is true for XFS, or just about any other self-contained in a module
subsystem I can think of.  My current XFS trace events stuff includes
tons of headers in the xfs header in include/trace and adds -Ifs/xfs to
kernel/trace/Makefile.  The latter should be gone by the new
implementation compiling the tracing stubs into the module, but it's
still not pretty.

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