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

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Date:	Wed, 26 Aug 2009 10:43:33 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
cc:	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, peterz@...radead.org,
	mathieu.desnoyers@...ymtl.ca, jiayingz@...gle.com,
	mbligh@...gle.com, lizf@...fujitsu.com,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH 08/12] add trace events for each syscall entry/exit


On Wed, 26 Aug 2009, Heiko Carstens wrote:
> > Ah, there are callsites that use kernel_thread() directly?
> > Does it means that t->mm could be non NULL for such resulting
> > kernel threads, in that case it would be hard to hook on
> > do_fork() to check that.
> 
> Oh yes, you are right. kernel threads created with kernel_thread()
> have t->mm != NULL if the forking process has an mm too.
> 
> There are very few callsites left which still use kernel_thread().
> (the last one in s390 driver code will be gone after the next
> merge window).
> 
> As far as I can there are only four callsites left
> (excluding staging): jffs2 and three in net/bluetooth/*

Ouch! Those need to be fixed.

Thanks,

-- Steve

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