Re: [PATCH v4 3/3] trace: Add an output of trace event logs to STM
From: Chunyan Zhang
Date: Wed Aug 05 2015 - 08:53:19 EST
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@xxxxxxxxxx> 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@xxxxxxxxxx>
> ---
> 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
>
--
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/