perf session: Use evlist/evsel for managing perf.data attributes

So that we can reuse things like the id to attr lookup routine
(perf_evlist__id2evsel) that uses a hash table instead of the linear
lookup done in the older perf_header_attr routines, etc.

Also to make evsels/evlist more pervasive an API, simplyfing using the
emerging perf lib.

cc: Arun Sharma <arun@sharma-home.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 417f757e3cbe..80c9e062bd5b 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -883,7 +883,6 @@ try_again:
 static int __cmd_top(void)
 {
         pthread_t thread;
-        struct perf_evsel *first;
         int ret __used;
         /*
          * FIXME: perf_session__new should allow passing a O_MMAP, so that all this
@@ -900,8 +899,8 @@ static int __cmd_top(void)
                 perf_event__synthesize_threads(perf_event__process, session);
 
         start_counters(top.evlist);
-        first = list_entry(top.evlist->entries.next, struct perf_evsel, node);
-        perf_session__set_sample_type(session, first->attr.sample_type);
+        session->evlist = top.evlist;
+        perf_session__update_sample_type(session);
 
         /* Wait for a minimal set of events before starting the snapshot */
         poll(top.evlist->pollfd, top.evlist->nr_fds, 100);