perf tools: Introduce perf_session class

That does all the initialization boilerplate, opening the file,
reading the header, checking if it is valid, etc.

And that will as well have the threads list, kmap (now) global
variable, etc, so that we can handle two (or more) perf.data files
describing sessions to compare.

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: <1260573842-19720-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 10 insertions, 3 deletions

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 7cca7c15b40a..65021fe1361e 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -6,6 +6,7 @@
 #include "util/symbol.h"
 #include "util/thread.h"
 #include "util/header.h"
+#include "util/session.h"
 
 #include "util/parse-options.h"
 #include "util/trace-event.h"
@@ -21,7 +22,6 @@
 
 static char                     const *input_name = "perf.data";
 
-static struct perf_header       *header;
 static u64                      sample_type;
 
 static char                     default_sort_order[] = "avg, max, switch, runtime";
@@ -1663,11 +1663,18 @@ static struct perf_file_handler file_handler = {
 
 static int read_events(void)
 {
+        int err;
+        struct perf_session *session = perf_session__new(input_name, O_RDONLY, 0);
+
+        if (session == NULL)
+                return -ENOMEM;
+
         register_idle_thread();
         register_perf_file_handler(&file_handler);
 
-        return mmap_dispatch_perf_file(&header, input_name, 0, 0,
-                                       &event__cwdlen, &event__cwd);
+        err = perf_session__process_events(session, 0, &event__cwdlen, &event__cwd);
+        perf_session__delete(session);
+        return err;
 }
 
 static void print_bad_events(void)