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Groups > linux.kernel > #1218465 > unrolled thread

[RFC/PATCH 1/3] perf probe: Split add_perf_probe_events()

Started byNamhyung Kim <namhyung@kernel.org>
First post2015-09-03 19:40 +0200
Last post2015-09-04 04:20 +0200
Articles 4 — 2 participants

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  [RFC/PATCH 1/3] perf probe: Split add_perf_probe_events() Namhyung Kim <namhyung@kernel.org> - 2015-09-03 19:40 +0200
    [RFC/PATCH 3/3] perf probe: Move print logic into cmd_probe() Namhyung Kim <namhyung@kernel.org> - 2015-09-03 19:40 +0200
      RE: [RFC/PATCH 3/3] perf probe: Move print logic into cmd_probe() 平松雅巳 / HIRAMATU，MASAMI   <masami.hiramatsu.pt@hitachi.com> - 2015-09-04 04:20 +0200
    RE: [RFC/PATCH 1/3] perf probe: Split add_perf_probe_events() 平松雅巳 / HIRAMATU，MASAMI   <masami.hiramatsu.pt@hitachi.com> - 2015-09-04 04:20 +0200

#1218465 — [RFC/PATCH 1/3] perf probe: Split add_perf_probe_events()

FromNamhyung Kim <namhyung@kernel.org>
Date2015-09-03 19:40 +0200
Subject[RFC/PATCH 1/3] perf probe: Split add_perf_probe_events()
Message-ID<q4GEq-1WX-7@gated-at.bofh.it>
The add_perf_probe_events() does 3 things:

 1. convert all perf events to trace events
 2. add all trace events to kernel
 3. cleanup all trace events

But sometimes we need to do something with the trace events.  So split
the funtion into two, so that it can access intermediate trace events
via struct __event_package if needed.

Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/probe-event.c | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index eb5f18b75402..8eaa03428d72 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2765,9 +2765,10 @@ struct __event_package {
 	int				ntevs;
 };
 
-int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
+static int __add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
+				   struct __event_package **ppkgs)
 {
-	int i, j, ret;
+	int i, ret;
 	struct __event_package *pkgs;
 
 	ret = 0;
@@ -2792,7 +2793,7 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
 		ret  = convert_to_probe_trace_events(pkgs[i].pev,
 						     &pkgs[i].tevs);
 		if (ret < 0)
-			goto end;
+			return ret;
 		pkgs[i].ntevs = ret;
 	}
 	/* This just release blacklist only if allocated */
@@ -2806,7 +2807,19 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
 		if (ret < 0)
 			break;
 	}
-end:
+
+	*ppkgs = pkgs;
+
+	return 0;
+}
+
+static void cleanup_perf_probe_events(struct __event_package *pkgs, int npevs)
+{
+	int i, j;
+
+	if (pkgs == NULL)
+		return;
+
 	/* Loop 3: cleanup and free trace events  */
 	for (i = 0; i < npevs; i++) {
 		for (j = 0; j < pkgs[i].ntevs; j++)
@@ -2815,6 +2828,15 @@ end:
 	}
 	free(pkgs);
 	exit_symbol_maps();
+}
+
+int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
+{
+	int ret;
+	struct __event_package *pkgs = NULL;
+
+	ret = __add_perf_probe_events(pevs, npevs, &pkgs);
+	cleanup_perf_probe_events(pkgs, npevs);
 
 	return ret;
 }
-- 
2.5.0

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#1218466 — [RFC/PATCH 3/3] perf probe: Move print logic into cmd_probe()

FromNamhyung Kim <namhyung@kernel.org>
Date2015-09-03 19:40 +0200
Subject[RFC/PATCH 3/3] perf probe: Move print logic into cmd_probe()
Message-ID<q4GEr-1WX-31@gated-at.bofh.it>
In reply to#1218465
Showing actual trace event when adding perf events is only needed in
perf probe command.  But the add functionality itself can be used by
other places.  So move the printing code into the cmd_probe().

Also it combines the output if more than one event is added.

Before:
  $ sudo perf probe -a do_fork -a do_exit
  Added new event:
  probe:do_fork        (on do_fork)

  You can now use it in all perf tools, such as:

      perf record -e probe:do_fork -aR sleep 1

  Added new events:
  probe:do_exit        (on do_exit)
  probe:do_exit_1      (on do_exit)

  You can now use it in all perf tools, such as:

      perf record -e probe:do_exit_1 -aR sleep 1

After:
  $ sudo perf probe -a do_fork -a do_exit
  Added new events:
  probe:do_fork        (on do_fork)
  probe:do_exit        (on do_exit)
  probe:do_exit_1      (on do_exit)

  You can now use it in all perf tools, such as:

      perf record -e probe:do_exit_1 -aR sleep 1

Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/builtin-probe.c    | 39 ++++++++++++++++++++++++++++++++++++++-
 tools/perf/util/probe-event.c | 22 +++-------------------
 tools/perf/util/probe-event.h |  3 +++
 3 files changed, 44 insertions(+), 20 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index b81cec33b4b2..827eb7ed92b2 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -403,6 +403,9 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT_END()
 	};
 	int ret;
+	int i, k;
+	struct probe_event_package *pkgs = NULL;
+	const char *event = NULL, *group = NULL;
 
 	set_option_flag(options, 'a', "add", PARSE_OPT_EXCLUSIVE);
 	set_option_flag(options, 'd', "del", PARSE_OPT_EXCLUSIVE);
@@ -496,7 +499,41 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 			usage_with_options(probe_usage, options);
 		}
 
-		ret = add_perf_probe_events(params.events, params.nevents);
+		ret = __add_perf_probe_events(params.events, params.nevents,
+					      &pkgs);
+		if (ret < 0)
+			goto out_cleanup;
+
+		for (i = k = 0; i < params.nevents; i++)
+			k += pkgs[i].ntevs;
+
+		pr_info("Added new event%s\n", (k > 1) ? "s:" : ":");
+		for (i = 0; i < params.nevents; i++) {
+			struct perf_probe_event *pev = pkgs[i].pev;
+
+			for (k = 0; k < pkgs[i].ntevs; k++) {
+				struct probe_trace_event *tev = &pkgs[i].tevs[k];
+
+				/* We use tev's name for showing new events */
+				show_perf_probe_event(tev->group, tev->event, pev,
+						      tev->point.module, false);
+
+				/* Save the last valid name */
+				event = tev->event;
+				group = tev->group;
+			}
+		}
+
+		/* Note that it is possible to skip all events because of blacklist */
+		if (event) {
+			/* Show how to use the event. */
+			pr_info("\nYou can now use it in all perf tools, such as:\n\n");
+			pr_info("\tperf record -e %s:%s -aR sleep 1\n\n", group, event);
+		}
+
+out_cleanup:
+		cleanup_perf_probe_events(pkgs, params.nevents);
+
 		if (ret < 0) {
 			pr_err_with_code("  Error: Failed to add events.", ret);
 			return ret;
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index eef39338bb2a..9c68fc551f9e 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2180,9 +2180,9 @@ out:
 }
 
 /* Show an event */
-static int show_perf_probe_event(const char *group, const char *event,
-				 struct perf_probe_event *pev,
-				 const char *module, bool use_stdout)
+int show_perf_probe_event(const char *group, const char *event,
+			  struct perf_probe_event *pev,
+			  const char *module, bool use_stdout)
 {
 	struct strbuf buf = STRBUF_INIT;
 	int ret;
@@ -2399,7 +2399,6 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
 {
 	int i, fd, ret;
 	struct probe_trace_event *tev = NULL;
-	const char *event = NULL, *group = NULL;
 	struct strlist *namelist;
 
 	fd = probe_file__open(PF_FL_RW | (pev->uprobes ? PF_FL_UPROBE : 0));
@@ -2415,7 +2414,6 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
 	}
 
 	ret = 0;
-	pr_info("Added new event%s\n", (ntevs > 1) ? "s:" : ":");
 	for (i = 0; i < ntevs; i++) {
 		tev = &tevs[i];
 		/* Skip if the symbol is out of .text or blacklisted */
@@ -2432,13 +2430,6 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
 		if (ret < 0)
 			break;
 
-		/* We use tev's name for showing new events */
-		show_perf_probe_event(tev->group, tev->event, pev,
-				      tev->point.module, false);
-		/* Save the last valid name */
-		event = tev->event;
-		group = tev->group;
-
 		/*
 		 * Probes after the first probe which comes from same
 		 * user input are always allowed to add suffix, because
@@ -2450,13 +2441,6 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
 	if (ret == -EINVAL && pev->uprobes)
 		warn_uprobe_event_compat(tev);
 
-	/* Note that it is possible to skip all events because of blacklist */
-	if (ret >= 0 && event) {
-		/* Show how to use the event. */
-		pr_info("\nYou can now use it in all perf tools, such as:\n\n");
-		pr_info("\tperf record -e %s:%s -aR sleep 1\n\n", group, event);
-	}
-
 	strlist__delete(namelist);
 close_out:
 	close(fd);
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index 73f922fa7cac..843d1feffc97 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -149,6 +149,9 @@ extern int __add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
 extern void cleanup_perf_probe_events(struct probe_event_package *pkgs,
 				      int npevs);
 extern int del_perf_probe_events(struct strfilter *filter);
+extern int show_perf_probe_event(const char *group, const char *event,
+				 struct perf_probe_event *pev,
+				 const char *module, bool use_stdout);
 extern int show_perf_probe_events(struct strfilter *filter);
 extern int show_line_range(struct line_range *lr, const char *module,
 			   bool user);
-- 
2.5.0

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#1218648 — RE: [RFC/PATCH 3/3] perf probe: Move print logic into cmd_probe()

From平松雅巳 / HIRAMATU，MASAMI <masami.hiramatsu.pt@hitachi.com>
Date2015-09-04 04:20 +0200
SubjectRE: [RFC/PATCH 3/3] perf probe: Move print logic into cmd_probe()
Message-ID<q4OLE-5eV-7@gated-at.bofh.it>
In reply to#1218466
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#1218645

From平松雅巳 / HIRAMATU，MASAMI <masami.hiramatsu.pt@hitachi.com>
Date2015-09-04 04:20 +0200
Message-ID<q4OLD-5eV-1@gated-at.bofh.it>
In reply to#1218465
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