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@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1380395584-9025-2-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index fc14f9bf82c8..901397ae82be 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;
+}