linux-kernel - Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3)

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Message-Id: <1219182471.7826.16.camel@pasglop>
Date:	Wed, 20 Aug 2008 07:47:51 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Scott Wood <scottwood@...escale.com>,
	Eran Liberty <liberty@...ricom.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Steven Rostedt <srostedt@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3)


> 
> Ok, there are two cases where it's ok :
> 
> 1 - in stop_machine, considering we are not touching code executed in
> NMI handlers.
> 2 - when using my replace_instruction_safe() which uses a temporary
> breakpoint when doing the instruction replacement.
> 
> In those cases you could use text_poke_early().

Note that vmap/vunmap will be very slow.

Ben.


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