linux-kernel - Re: [PATCH v2 00/15] tracing: 'hist' triggers

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Date:	Mon, 2 Mar 2015 15:39:48 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Karim Yaghmour <karim.yaghmour@...rsys.com>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH v2 00/15] tracing: 'hist' triggers

On Mon, 2 Mar 2015 12:33:34 -0800
Alexei Starovoitov <ast@...mgrid.com> wrote:

> On Mon, Mar 2, 2015 at 11:49 AM, Karim Yaghmour
> <karim.yaghmour@...rsys.com> wrote:
> >
> > On 15-03-02 02:45 PM, Steven Rostedt wrote:
> >> Interesting. The Android devices I have still have it enabled (rooted,
> >> but still running the stock system).
> >
> > I don't know that there's any policy to disable tracing on Android. The
> > Android framework in fact has generally been instrumented by Google
> > itself to output trace info into trace_marker. And the systrace/atrace
> > tools made available to app developers need to get access to this
> > tracing info. So, if Android had tracing disabled, systrace/atrace
> > wouldn't work.
> > https://developer.android.com/tools/debugging/systrace.html
> 
> that's interesting. thanks for the link.
> 
> I don't see tracing being explicitly enabled in defconfig:
> https://source.android.com/devices/tech/kernel.html

CONFIG_SCHED_TRACER=y

That alone will enable tracing.

-- Steve

> or here:
> https://android.googlesource.com/kernel/common/+/android-3.10/android/configs/android-recommended.cfg

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