linux-kernel - Re: [PATCH 07/10] perf script: Move printing of 'common' data from print

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Date:	Thu, 10 Mar 2011 00:50:11 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	David Ahern <daahern@...co.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 07/10] perf script: Move printing of 'common' data from
 print_event and rename

On Wed, Mar 09, 2011 at 03:31:28PM -0300, Arnaldo Carvalho de Melo wrote:
> From: David Ahern <daahern@...co.com>
> 
> This change does impact output: latency data is trace specific and is now
> printed after the common data - comm, tid, cpu, time and event name.
> 
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> LPU-Reference: <1299606342-26745-3-git-send-email-daahern@...co.com>
> Signed-off-by: David Ahern <daahern@...co.com>
> [ committer note: Added space after print_lat_fmt() ]
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  tools/perf/builtin-script.c         |   38 ++++++++++--
>  tools/perf/util/trace-event-parse.c |  106 +++--------------------------------
>  tools/perf/util/trace-event.h       |    3 +-
>  3 files changed, 41 insertions(+), 106 deletions(-)
> 
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index b2bdd55..0a79da2 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -20,18 +20,42 @@ static u64			last_timestamp;
>  static u64			nr_unordered;
>  extern const struct option	record_options[];
>  
> +static void print_sample_start(struct perf_sample *sample,
> +			       struct thread *thread)
> +{
> +	int type;
> +	struct event *event;
> +	const char *evname = NULL;
> +	unsigned long secs;
> +	unsigned long usecs;
> +	unsigned long long nsecs = sample->time;
> +
> +	if (latency_format)

I believe we don't yet make use of the latency format with perf.
Like the function graph output, it was included in that code coming
from trace-cmd.

We might use it in the future though, so it looks fine to keep it
and handle it like you did.

> +		printf("%8.8s-%-5d %3d", thread->comm, sample->tid, sample->cpu);
> +	else
> +		printf("%16s-%-5d [%03d]", thread->comm, sample->tid, sample->cpu);
> +
> +	secs = nsecs / NSECS_PER_SEC;
> +	nsecs -= secs * NSECS_PER_SEC;
> +	usecs = nsecs / NSECS_PER_USEC;
> +	printf(" %5lu.%06lu: ", secs, usecs);
> +
> +	type = trace_parse_common_type(sample->raw_data);
> +	event = trace_find_event(type);
> +	if (event)
> +		evname = event->name;
> +
> +	printf("%s: ", evname ? evname : "(unknown)");
> +}
> +
[...]
> +++ b/tools/perf/util/trace-event-parse.c
> @@ -2648,63 +2648,8 @@ static void print_lat_fmt(void *data, int size __unused)
>  		printf("%d", lock_depth);
>  }
>  
> -/* taken from Linux, written by Frederic Weisbecker */
> -static void print_graph_cpu(int cpu)
> -{
> -	int i;
> -	int log10_this = log10_cpu(cpu);
> -	int log10_all = log10_cpu(cpus);
> -
> -
> -	/*
> -	 * Start with a space character - to make it stand out
> -	 * to the right a bit when trace output is pasted into
> -	 * email:
> -	 */
> -	printf(" ");
> -
> -	/*
> -	 * Tricky - we space the CPU field according to the max
> -	 * number of online CPUs. On a 2-cpu system it would take
> -	 * a maximum of 1 digit - on a 128 cpu system it would
> -	 * take up to 3 digits:
> -	 */
> -	for (i = 0; i < log10_all - log10_this; i++)
> -		printf(" ");
> -
> -	printf("%d) ", cpu);
> -}

So, we indeed don't use the function graph tracer with perf yet.
But there are fair chances we will in the future.

So if we remove such code, I would prefer this to be made as
a seperate commit. Something we can easily retrieve and revert
in the future.

Other than that and the callchain bug, the whole series looks
pretty good now.

Thanks a lot!
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