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

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Message-ID: <alpine.DEB.2.00.0908261044071.23885@gandalf.stny.rr.com>
Date:	Wed, 26 Aug 2009 10:44:33 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>,
	Jason Baron <jbaron@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mathieu Desnoyers <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, Frederic Weisbecker wrote:
> > 
> > All kernel threads have a NULL t->mm. Since do_fork is called by kthreadd 
> > and not by kthread_create, the caller of do_fork will also have a
> > t->mm = NULL.
> > 
> > -- Steve
> > 
> 
> Yeah, that's the case with kthread_create() creation fashion,
> but what if you create a kernel thread using the low level
> kernel_thread() directly (ie: without relaying on kthreadd queue)?
> 
> Especially in Heiko example, it seems to be a duplication of user
> task.
> 
> I wonder what obvious think I'm missing here...

The obvious is that those calls are buggy ;-)

-- Steve

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