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

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Message-ID: <48AB5E36.8030400@goop.org>
Date:	Tue, 19 Aug 2008 16:58:46 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	benh@...nel.crashing.org
CC:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	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>,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3)

Benjamin Herrenschmidt wrote:
>> 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.
>   

Don't we have Nick's speedups now?

    J
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