linux-kernel - [PATCH v0 13/71] perf tools: Add machine__get_thread

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Date:	Wed, 11 Dec 2013 14:36:25 +0200
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH v0 13/71] perf tools: Add machine__get_thread_pid()

From: Adrian Hunter <adrian.hunter@...el.com>

Add a function to get the pid from the tid.

This is needed when using the sched_switch
tracepoint to follow object code execution.
sched_switch identifies the thread but, to
find the process mmaps, we need the process
pid.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/machine.c | 10 ++++++++++
 tools/perf/util/machine.h |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index bac817a..55f3608 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1402,3 +1402,13 @@ int __machine__synthesize_threads(struct machine *machine, struct perf_tool *too
 	/* command specified */
 	return 0;
 }
+
+pid_t machine__get_thread_pid(struct machine *machine, pid_t tid)
+{
+	struct thread *thread = machine__find_thread(machine, tid);
+
+	if (!thread)
+		return -1;
+
+	return thread->pid_;
+}
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index 4771330..b800a5a 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -190,4 +190,6 @@ int machine__synthesize_threads(struct machine *machine, struct target *target,
 					     perf_event__process, data_mmap);
 }
 
+pid_t machine__get_thread_pid(struct machine *machine, pid_t tid);
+
 #endif /* __PERF_MACHINE_H */
-- 
1.8.5.1

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