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Date: Fri, 17 Jul 2015 17:07:39 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Chunyan Zhang <zhang.chunyan@...aro.org>
Cc: mingo@...hat.com, mathieu.poirier@...aro.org,
serge.broslavsky@...aro.org, broonie@...nel.org,
alexander.shishkin@...ux.intel.com, zhang.lyra@...il.com,
linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v3 4/4] trace: Trace log handler for logging into
STM blocks
On Tue, 7 Jul 2015 18:10:43 +0800
Chunyan Zhang <zhang.chunyan@...aro.org> wrote:
> Add the function 'trace_event_stm_output_##call' for printing events
> trace log into STM blocks.
>
> This patch also adds a function call at where the events have been
> committed to ring buffer to export the trace event information to
> STM blocks.
>
> Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
> ---
> include/linux/trace_events.h | 8 ++++++++
> include/trace/perf.h | 3 +++
> include/trace/trace_events.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 55 insertions(+)
>
> diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
> index 28dcdff..705bd4e 100644
> --- a/include/linux/trace_events.h
> +++ b/include/linux/trace_events.h
> @@ -418,6 +418,14 @@ enum event_trigger_type {
>
> #ifdef CONFIG_STM_TRACE_EVENT
> extern void stm_trace_event_write(const char *buf, unsigned len);
> +extern void trace_event_stm_log(struct trace_event_buffer *buffer);
> +extern void trace_event_buf_vprintf(struct trace_buffer_stm *tb,
> + const char *fmt, ...) __attribute__ ((weak));
> +#else
> +static inline void trace_event_stm_log(struct trace_event_buffer *buffer) {}
> +static inline void trace_event_buf_vprintf(struct trace_buffer_stm *tb,
> + const char *fmt, ...) {}
> +
> #endif
>
> extern int filter_match_preds(struct event_filter *filter, void *rec);
> diff --git a/include/trace/perf.h b/include/trace/perf.h
> index 1b5443c..79906de 100644
> --- a/include/trace/perf.h
> +++ b/include/trace/perf.h
> @@ -175,6 +175,7 @@ trace_event_raw_event_##call(void *__data, proto) \
> { assign; } \
> \
> trace_event_buffer_commit(&fbuffer); \
> + trace_event_stm_log(&fbuffer); \
This could be moved into trace_event_buffer_commit().
> }
> /*
> * The ftrace_test_probe is compiled out, it is only here as a build time check
> @@ -234,6 +235,7 @@ static struct trace_event_call __used event_##call = { \
> .event.funcs = &trace_event_type_funcs_##template, \
> .print_fmt = print_fmt_##template, \
> .flags = TRACE_EVENT_FL_TRACEPOINT, \
> + .output_stm = trace_event_stm_output_##template, \
> }; \
> static struct trace_event_call __used \
> __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
> @@ -251,6 +253,7 @@ static struct trace_event_call __used event_##call = { \
> .event.funcs = &trace_event_type_funcs_##call, \
> .print_fmt = print_fmt_##call, \
> .flags = TRACE_EVENT_FL_TRACEPOINT, \
> + .output_stm = trace_event_stm_output_##call, \
> }; \
> static struct trace_event_call __used \
> __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
> diff --git a/include/trace/trace_events.h b/include/trace/trace_events.h
> index 43be3b0..db4d8a7 100644
> --- a/include/trace/trace_events.h
> +++ b/include/trace/trace_events.h
> @@ -303,6 +303,50 @@ TRACE_MAKE_SYSTEM_STR();
>
> #undef DECLARE_EVENT_CLASS
> #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
> +static notrace void \
> +trace_event_stm_output_##call(struct trace_seq *tmp_seq, \
> + void *entry, \
> + struct trace_buffer_stm *trace_buf) \
> +{ \
> + struct trace_event_raw_##call *field = entry; \
> + struct trace_seq *p = tmp_seq; \
> + \
> + trace_seq_init(p); \
> + \
> + trace_event_buf_vprintf(trace_buf, print); \
> + \
> + return; \
> +}
> +
> +#undef DEFINE_EVENT_PRINT
> +#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
> +static notrace void \
> +trace_event_stm_output_##call(struct trace_seq *tmp_seq, \
> + void *entry, \
> + struct trace_buffer_stm *trace_buf) \
> +{ \
> + struct trace_seq *p = tmp_seq; \
> + struct trace_entry *ent = entry; \
> + struct trace_event_raw_##template *field; \
> + \
> + if (ent->type != event_##call.event.type) { \
> + WARN_ON_ONCE(1); \
> + return; \
> + } \
> + \
> + field = (typeof(field))entry; \
> + \
> + trace_seq_init(p); \
> + \
> + trace_event_buf_vprintf(trace_buf, print); \
> + \
> + return; \
> +}
To save a lot of code, as this is duplicated for hundreds of events,
you could simply reuse the trace_raw_output_##call(), by passing in
a trace_iterator() with just enough to get through it. We can even add
a flag to not do the output_prep() work, if need be.
-- Steve
> +
> +#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
> +
> +#undef DECLARE_EVENT_CLASS
> +#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
> static notrace enum print_line_t \
> trace_raw_output_##call(struct trace_iterator *iter, int flags, \
> struct trace_event *trace_event) \
--
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