linux-kernel - Re: [PATCH 08/12] add trace events for each syscall entry/exit

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Message-ID: <20090826184236.GA24102@infradead.org>
Date:	Wed, 26 Aug 2009 14:42:36 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>,
	Jason Baron <jbaron@...hat.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, laijs@...fujitsu.com, rostedt@...dmis.org,
	jiayingz@...gle.com, mbligh@...gle.com, lizf@...fujitsu.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH 08/12] add trace events for each syscall entry/exit

On Wed, Aug 26, 2009 at 02:41:16PM -0400, Christoph Hellwig wrote:
> We do not support system calls from kernelspace anymore.  All the
> macros to do real system calls are gone, and there are very very few
> places left calling sys_foo as normal function calls.
> 
> An how exactly is calling sys_foo as a normal function call different
> from calling do_foo or vfs_foo?

And if you really need to trace direct callers of sys_foo just put
a jprobe on it.

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