linux-kernel - Re: [PATCH 08/19] perf ftrace: add option -l/--long-info to show more info

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Date:   Sat, 6 Jun 2020 22:14:51 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Changbin Du <changbin.du@...il.com>, Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/19] perf ftrace: add option -l/--long-info to show
 more info

On Wed, May 20, 2020 at 06:02:57PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Sun, May 10, 2020 at 11:06:17PM +0800, Changbin Du escreveu:
> > Sometimes we want ftrace display more and longer information about trace.
> 
> Humm, -v? Or that would bring too much stuff from other parts of perf?
> I guess so, perhaps as an option to the function-graph tracer, one that
> combines, as you do, several options provided by that tracer?
>
yes, this option enables mutiple trace options onetime, which will make the
function tracer or graph tracer output as much as more information per-line. So I call it
as 'long'.

> - Arnaldo
>  
> > $ sudo perf ftrace -G -l
> >  6800.190937 |   4)   <...>-7683   |   2.072 us    |  mutex_unlock();
> >  6800.190941 |   4)   <...>-7683   |   2.171 us    |  __fsnotify_parent();
> >  6800.190943 |   4)   <...>-7683   |   1.497 us    |  fsnotify();
> >  6800.190944 |   4)   <...>-7683   |   0.775 us    |  __sb_end_write();
> >  6800.190945 |   4)   <...>-7683   |   0.854 us    |  fpregs_assert_state_consistent();
> >  6800.190947 |   4)   <...>-7683   |               |  do_syscall_64() {
> >  6800.190948 |   4)   <...>-7683   |               |    __x64_sys_close() {
> >  6800.190948 |   4)   <...>-7683   |               |      __close_fd() {
> >  6800.190948 |   4)   <...>-7683   |   0.322 us    |        _raw_spin_lock();
> >  6800.190949 |   4)   <...>-7683   |               |        filp_close() {
> >  6800.190949 |   4)   <...>-7683   |   0.320 us    |          dnotify_flush();
> >  6800.190950 |   4)   <...>-7683   |   0.325 us    |          locks_remove_posix();
> > 
> > Signed-off-by: Changbin Du <changbin.du@...il.com>
> > ---
> >  tools/perf/builtin-ftrace.c | 28 ++++++++++++++++++++++++++++
> >  1 file changed, 28 insertions(+)
> > 
> > diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
> > index b16600a16efa..f11f2d3431b0 100644
> > --- a/tools/perf/builtin-ftrace.c
> > +++ b/tools/perf/builtin-ftrace.c
> > @@ -42,6 +42,7 @@ struct perf_ftrace {
> >  	bool			func_stack_trace;
> >  	bool			nosleep_time;
> >  	bool			nofuncgraph_irqs;
> > +	bool			long_info;
> >  };
> >  
> >  struct filter_entry {
> > @@ -190,6 +191,9 @@ static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused)
> >  	write_tracing_option_file("func_stack_trace", "0");
> >  	write_tracing_option_file("sleep-time", "1");
> >  	write_tracing_option_file("funcgraph-irqs", "1");
> > +	write_tracing_option_file("funcgraph-proc", "0");
> > +	write_tracing_option_file("funcgraph-abstime", "0");
> > +	write_tracing_option_file("irq-info", "0");
> >  }
> >  
> >  static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
> > @@ -371,6 +375,23 @@ static int set_tracing_funcgraph_irqs(struct perf_ftrace *ftrace)
> >  	return 0;
> >  }
> >  
> > +static int set_tracing_long_info(struct perf_ftrace *ftrace)
> > +{
> > +	if (!ftrace->long_info)
> > +		return 0;
> > +
> > +	if (write_tracing_option_file("funcgraph-proc", "1") < 0)
> > +		return -1;
> > +
> > +	if (write_tracing_option_file("funcgraph-abstime", "1") < 0)
> > +		return -1;
> > +
> > +	if (write_tracing_option_file("irq-info", "1") < 0)
> > +		return -1;
> > +
> > +	return 0;
> > +}
> > +
> >  static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
> >  {
> >  	char *trace_file;
> > @@ -449,6 +470,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
> >  		goto out_reset;
> >  	}
> >  
> > +	if (set_tracing_long_info(ftrace) < 0) {
> > +		pr_err("failed to set tracing option funcgraph-proc/funcgraph-abstime/irq-info\n");
> > +		goto out_reset;
> > +	}
> > +
> >  	if (write_tracing_file("current_tracer", ftrace->tracer) < 0) {
> >  		pr_err("failed to set current_tracer to %s\n", ftrace->tracer);
> >  		goto out_reset;
> > @@ -588,6 +614,8 @@ int cmd_ftrace(int argc, const char **argv)
> >  		    "Measure on-CPU time only (function_graph only)"),
> >  	OPT_BOOLEAN(0, "nofuncgraph-irqs", &ftrace.nofuncgraph_irqs,
> >  		    "Ignore functions that happen inside interrupt (function_graph only)"),
> > +	OPT_BOOLEAN('l', "long-info", &ftrace.long_info,
> > +		    "Show process names, PIDs, timestamps, irq-info if available"),
> >  	OPT_END()
> >  	};
> >  
> > -- 
> > 2.25.1
> > 
> 
> -- 
> 
> - Arnaldo

-- 
Cheers,
Changbin Du