netdev - Re: [PATCH v5 00/45] CPU hotplug: stop

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Date:	Tue, 19 Feb 2013 11:33:42 +0100
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	paulmck@...ux.vnet.ibm.com,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-doc@...r.kernel.org, peterz@...radead.org,
	fweisbec@...il.com, linux-kernel@...r.kernel.org,
	walken@...gle.com, mingo@...nel.org, linux-arch@...r.kernel.org,
	xiaoguangrong@...ux.vnet.ibm.com, wangyun@...ux.vnet.ibm.com,
	nikunj@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>, rjw@...k.pl,
	namhyung@...nel.org, tglx@...utronix.de,
	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	oleg@...hat.com, sbw@....edu, tj@...nel.org,
	akpm@...ux-foundation.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v5 00/45] CPU hotplug: stop_machine()-free CPU hotplug

On 18 February 2013 20:53, Steven Rostedt <rostedt@...dmis.org> wrote:
> On Mon, 2013-02-18 at 17:50 +0100, Vincent Guittot wrote:
>
>> yes for sure.
>> The problem is more linked to cpuidle and function tracer.
>>
>> cpu hotplug and function tracer work when cpuidle is disable.
>> cpu hotplug and cpuidle works if i don't enable function tracer.
>> my platform is dead as soon as I enable function tracer if cpuidle is
>> enabled. It looks like some notrace are missing in my platform driver
>> but we haven't completely fix the issue yet
>>
>
> You can bisect to find out exactly what function is the problem:
>
>  cat /debug/tracing/available_filter_functions > t
>
> f(t) {
>  num=`wc -l t`
>  sed -ne "1,${num}p" t > t1
>  let num=num+1
>  sed -ne "${num},$p" t > t2
>
>  cat t1 > /debug/tracing/set_ftrace_filter
>  # note this may take a long time to finish
>
>  echo function > /debug/tracing/current_tracer
>
>  <failed? bisect f(t1), if not bisect f(t2)>
> }
>

Thanks, i'm going to have a look

Vincent

> -- Steve
>
>
>
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