perf session: Reduce the number of parms to perf_session__process_events

By having the cwd/cwdlen in the perf_session struct and
full_paths in perf_event_ops.

Now its just a matter of passing the ops.

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: <1260741029-4430-4-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 3976686..534a877 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -61,6 +61,9 @@
 		goto out_delete;
 
 	memcpy(self->filename, filename, len);
+	self->mmap_window = 32;
+	self->cwd = NULL;
+	self->cwdlen = 0;
 
 	if (mode == O_RDONLY && perf_session__open(self, force) < 0) {
 		perf_session__delete(self);
@@ -77,5 +80,6 @@
 {
 	perf_header__exit(&self->header);
 	close(self->fd);
+	free(self->cwd);
 	free(self);
 }