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

[Steven Rostedt]

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

> On Mon, Mar 2, 2015 at 11:49 AM, Karim Yaghmour
> <karim.yaghmour@xxxxxxxxxxx> 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/