linux-kernel - Re: [PATCH 03/52] perf tools: Add thread

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Date:	Mon, 26 Oct 2015 14:48:25 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Liang, Kan" <kan.liang@...el.com>
Subject: Re: [PATCH 03/52] perf tools: Add thread_map event

Em Mon, Oct 26, 2015 at 02:42:06PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Sun, Oct 25, 2015 at 03:51:19PM +0100, Jiri Olsa escreveu:
> > Adding thread_map event to pass/store thread maps
> > as data in pipe/perf.data.
> > 
> > Storing thread ID along with the standard comm[16]
> > thread name string.
> > 
> > Link: http://lkml.kernel.org/n/tip-2l07qyf3buhnt83q4ezqz5sj@git.kernel.org
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  tools/perf/util/event.c   |  1 +
> >  tools/perf/util/event.h   | 13 +++++++++++++
> >  tools/perf/util/session.c | 26 ++++++++++++++++++++++++++
> >  tools/perf/util/tool.h    |  3 ++-
> >  4 files changed, 42 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
> > index 8b10621b415c..771545a27b9b 100644
> > --- a/tools/perf/util/event.c
> > +++ b/tools/perf/util/event.c
> > @@ -37,6 +37,7 @@ static const char *perf_event__names[] = {
> >  	[PERF_RECORD_AUXTRACE_INFO]		= "AUXTRACE_INFO",
> >  	[PERF_RECORD_AUXTRACE]			= "AUXTRACE",
> >  	[PERF_RECORD_AUXTRACE_ERROR]		= "AUXTRACE_ERROR",
> > +	[PERF_RECORD_THREAD_MAP]		= "THREAD_MAP",
> >  };
> >  
> >  const char *perf_event__name(unsigned int id)
> > diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
> > index a0dbcbd4f6d8..f075f9ed0051 100644
> > --- a/tools/perf/util/event.h
> > +++ b/tools/perf/util/event.h
> > @@ -226,6 +226,7 @@ enum perf_user_event_type { /* above any possible kernel type */
> >  	PERF_RECORD_AUXTRACE_INFO		= 70,
> >  	PERF_RECORD_AUXTRACE			= 71,
> >  	PERF_RECORD_AUXTRACE_ERROR		= 72,
> > +	PERF_RECORD_THREAD_MAP			= 73,
> >  	PERF_RECORD_HEADER_MAX
> >  };
> >  
> > @@ -356,6 +357,17 @@ struct context_switch_event {
> >  	u32 next_prev_tid;
> >  };
> >  
> > +struct thread_map_data_event {
> 
> Humm, I think "data" here is way too vague here, how about
> "thread_map_event_entry"?
> 
> Moving of "entry" to the end also helps in understanding that this is
> not an "event" per se, it doesn't have the perv_event_header, etc, its
> just an entry in a 'struct thread_map_event'.
> 
> I'm tentatively doing this change in my local branch, please let me know
> if you have any reason to object to such a change,

The resulting patch, that I'm merging with this one:

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index f075f9ed0051..66f303e69c4d 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -357,7 +357,7 @@ struct context_switch_event {
 	u32 next_prev_tid;
 };
 
-struct thread_map_data_event {
+struct thread_map_event_entry {
 	u64	pid;
 	char	comm[16];
 };
@@ -365,7 +365,7 @@ struct thread_map_data_event {
 struct thread_map_event {
 	struct perf_event_header	header;
 	u64				nr;
-	struct thread_map_data_event	data[];
+	struct thread_map_event_entry	entries[];
 };
 
 union perf_event {
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index ec1ecd31003b..0aedce61f930 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -636,7 +636,7 @@ static void perf_event__thread_map_swap(union perf_event *event,
 	event->thread_map.nr = bswap_64(event->thread_map.nr);
 
 	for (i = 0; i < event->thread_map.nr; i++)
-		event->thread_map.data[i].pid = bswap_64(event->thread_map.data[i].pid);
+		event->thread_map.entries[i].pid = bswap_64(event->thread_map.entries[i].pid);
 }
 
 typedef void (*perf_event__swap_op)(union perf_event *event,
--
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