linux-kernel - [tip:perf/core] perf machine: Add method to loop over threads and invoke handler

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Date:	Mon, 14 Oct 2013 22:30:43 -0700
From:	tip-bot for David Ahern <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, eranian@...gle.com,
	hpa@...or.com, mingo@...nel.org, a.p.zijlstra@...llo.nl,
	namhyung.kim@....com, jolsa@...hat.com, fweisbec@...il.com,
	dsahern@...il.com, tglx@...utronix.de
Subject: [tip:perf/core] perf machine:
  Add method to loop over threads and invoke handler

Commit-ID:  35feee19f9fda7447f51073b5be3f6d082b508f5
Gitweb:     http://git.kernel.org/tip/35feee19f9fda7447f51073b5be3f6d082b508f5
Author:     David Ahern <dsahern@...il.com>
AuthorDate: Sat, 28 Sep 2013 13:12:58 -0600
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 11 Oct 2013 12:17:51 -0300

perf machine: Add method to loop over threads and invoke handler

Loop over all threads within a machine - including threads moved to the
dead threads list -- and invoked a function.

This allows commands to run some specific function on each thread (eg.,
dump statistics) yet hides how the threads are maintained within the
machine.

Signed-off-by: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung.kim@....com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/1380395584-9025-2-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/machine.c | 23 +++++++++++++++++++++++
 tools/perf/util/machine.h |  4 ++++
 2 files changed, 27 insertions(+)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index fc14f9b..901397a 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1393,3 +1393,26 @@ int machine__resolve_callchain(struct machine *machine,
 				   sample);
 
 }
+
+int machine__for_each_thread(struct machine *machine,
+			     int (*fn)(struct thread *thread, void *p),
+			     void *priv)
+{
+	struct rb_node *nd;
+	struct thread *thread;
+	int rc = 0;
+
+	for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
+		thread = rb_entry(nd, struct thread, rb_node);
+		rc = fn(thread, priv);
+		if (rc != 0)
+			return rc;
+	}
+
+	list_for_each_entry(thread, &machine->dead_threads, node) {
+		rc = fn(thread, priv);
+		if (rc != 0)
+			return rc;
+	}
+	return rc;
+}
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index 5150d5e..d44c09b 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -166,4 +166,8 @@ void machines__destroy_kernel_maps(struct machines *machines);
 
 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp);
 
+int machine__for_each_thread(struct machine *machine,
+			     int (*fn)(struct thread *thread, void *p),
+			     void *priv);
+
 #endif /* __PERF_MACHINE_H */
--
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