linux-kernel - [PATCH 03/16 v2] perf evlist: add initialzation function for tracepoints

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Message-Id: <1369527896-3650-4-git-send-email-dsahern@gmail.com>
Date:	Sat, 25 May 2013 18:24:43 -0600
From:	David Ahern <dsahern@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	acme@...stprotocols.net, mingo@...nel.org, fweisbec@...il.com,
	peterz@...radead.org, jolsa@...hat.com, namhyung@...nel.org,
	xiaoguangrong@...ux.vnet.ibm.com, runzhen@...ux.vnet.ibm.com,
	David Ahern <dsahern@...il.com>
Subject: [PATCH 03/16 v2] perf evlist: add initialzation function for tracepoints

Handles initializations typically done as part of processing the file
header and HEADER_TRACING_DATA event.

v2: close fd as noticed by Namhyung.

Signed-off-by: David Ahern <dsahern@...il.com>
Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc: Runzhen Wang <runzhen@...ux.vnet.ibm.com>
---
 tools/perf/util/evlist.c |   35 +++++++++++++++++++++++++++++++++++
 tools/perf/util/evlist.h |    3 +++
 2 files changed, 38 insertions(+)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 72b9551..b686411 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -14,6 +14,7 @@
 #include "target.h"
 #include "evlist.h"
 #include "evsel.h"
+#include "trace-event.h"
 #include <unistd.h>
 
 #include "parse-events.h"
@@ -234,6 +235,40 @@ int perf_evlist__prepare_tracepoint_events(struct perf_evlist *evlist,
 	return 0;
 }
 
+int perf_evlist__trace_init(struct perf_evlist *evlist,
+			    struct perf_session *session)
+{
+	struct tracing_data *tdata;
+	char temp_file[] = "/tmp/perf-XXXXXXXX";
+	int fd;
+	int rc = 0;
+
+	fd = mkstemp(temp_file);
+	if (fd < 0) {
+		pr_err("mkstemp failed\n");
+		return -1;
+	}
+	unlink(temp_file);
+
+	tdata = tracing_data_get(&evlist->entries, fd, false);
+	if (!tdata) {
+		rc = -1;
+		goto out;
+	}
+
+	lseek(fd, 0, SEEK_SET);
+	(void) trace_report(fd, &session->pevent, false);
+	tracing_data_put(tdata);
+
+	rc = perf_evlist__prepare_tracepoint_events(evlist, session->pevent);
+
+out:
+	close(fd);
+
+	return rc;
+}
+
+
 static int trace_event__id(const char *evname)
 {
 	char *filename, *colon;
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index c2cf183..c579f3d 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -8,6 +8,7 @@
 #include "event-parse.h"
 #include "evsel.h"
 #include "util.h"
+#include "session.h"
 #include <unistd.h>
 
 struct pollfd;
@@ -66,6 +67,8 @@ int perf_evlist__prepare_tracepoint_events(struct perf_evlist *evlist,
 int perf_evlist__add_tracepoints(struct perf_evlist *evlist,
 				 const char * const tracepoints[],
 				 size_t nr_tracepoints);
+int perf_evlist__trace_init(struct perf_evlist *evlist,
+			    struct perf_session *session);
 
 #define perf_evlist__add_default_attrs(evlist, array) \
 	__perf_evlist__add_default_attrs(evlist, array, ARRAY_SIZE(array))
-- 
1.7.10.1

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