linux-kernel - Re: [PATCH v4 3/3] trace: Add an output of trace event logs to STM

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Date:	Wed, 5 Aug 2015 20:52:49 +0800
From:	Chunyan Zhang <zhang.chunyan@...aro.org>
To:	Steven Rostedt <rostedt@...dmis.org>, mingo@...nel.org
Cc:	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Serge Broslavsky <serge.broslavsky@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3/3] trace: Add an output of trace event logs to STM

Hello Steve,

May I have your further comments/suggestions on this version of patchset?
I know you were just back from a vacation, and must be very busy
recently, but after you finished the most urgent matters, could you
please leave us a little bandwidth to think about how you want these
patches to be improved.

Like I said in the former emails, if you don't have enough time to do
all the modifications, I hope I can more or less help with something.
But I really need your guidance.

Thank you so much,
Chunyan

On Wed, Jul 22, 2015 at 11:46 AM, Chunyan Zhang
<zhang.chunyan@...aro.org> wrote:
> When the trace event happens, the traces would be committed to ring buffer.
> This patch will add an output of the traces to an STM at this moment,
> of course the precondition is TRACE_EVENT_STM be configured.
>
> Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
> ---
>  kernel/trace/trace_events.c | 2 ++
>  kernel/trace/trace_output.h | 7 +++++++
>  2 files changed, 9 insertions(+)
>
> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index 404a372..35fd171 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -249,6 +249,8 @@ void trace_event_buffer_commit(struct trace_event_buffer *fbuffer)
>         event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer,
>                                     fbuffer->event, fbuffer->entry,
>                                     fbuffer->flags, fbuffer->pc);
> +
> +       trace_event_stm_log(fbuffer);
>  }
>  EXPORT_SYMBOL_GPL(trace_event_buffer_commit);
>
> diff --git a/kernel/trace/trace_output.h b/kernel/trace/trace_output.h
> index 4cbfe85..28e25e9 100644
> --- a/kernel/trace/trace_output.h
> +++ b/kernel/trace/trace_output.h
> @@ -41,5 +41,12 @@ extern struct rw_semaphore trace_event_sem;
>  #define SEQ_PUT_HEX_FIELD(s, x)                                \
>         trace_seq_putmem_hex(s, &(x), sizeof(x))
>
> +#ifdef CONFIG_TRACE_EVENT_STM
> +extern void stm_trace_event_write(const char *buf, unsigned len);
> +extern void trace_event_stm_log(struct trace_event_buffer *buffer);
> +#else
> +static inline void trace_event_stm_log(struct trace_event_buffer *buffer) {}
> +#endif
> +
>  #endif
>
> --
> 1.9.1
>
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