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

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Message-ID: <20150302154311.3f14c949@gandalf.local.home>
Date:	Mon, 2 Mar 2015 15:43:11 -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 15:39:48 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> 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
> 

CONFIG_ENABLE_DEFAULT_TRACERS=y

And so will that.

-- Steve

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