perf session: Move the global threads list to perf_session

So that we can process two perf.data files.

We still need to add a O_MMAP mode for perf_session so that we
can do all the mmap stuff in it.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260741029-4430-5-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 1e0da9c..1dbef7c 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -3,11 +3,16 @@
 
 #include "event.h"
 #include "header.h"
+#include <linux/rbtree.h>
+
+struct thread;
 
 struct perf_session {
 	struct perf_header	header;
 	unsigned long		size;
 	unsigned long		mmap_window;
+	struct rb_root		threads;
+	struct thread		*last_match;
 	int			fd;
 	int			cwdlen;
 	char			*cwd;