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

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Message-ID: <CAMEtUuxAbVryGgP0GSszjNY_M=Sxwpi5NkwO9GExi4uWpdLnmg@mail.gmail.com>
Date:	Mon, 2 Mar 2015 12:33:34 -0800
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Karim Yaghmour <karim.yaghmour@...rsys.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	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, 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
or here:
https://android.googlesource.com/kernel/common/+/android-3.10/android/configs/android-recommended.cfg
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