perf evsel: Add hists helper

Not all tools need a hists instance per perf_evsel, so lets pave the way
to remove evsel->hists while leaving a way to access the hists from a
specially allocated evsel, one that comes with space at the end where
lives the evsel.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-qlktkhe31w4mgtbd84035sr2@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index be5939418425..c9a119e2113d 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -51,6 +51,7 @@ static int perf_evsel__add_sample(struct perf_evsel *evsel,
                                   struct addr_location *al,
                                   struct perf_annotate *ann)
 {
+        struct hists *hists = evsel__hists(evsel);
         struct hist_entry *he;
         int ret;
 
@@ -66,13 +67,12 @@ static int perf_evsel__add_sample(struct perf_evsel *evsel,
                 return 0;
         }
 
-        he = __hists__add_entry(&evsel->hists, al, NULL, NULL, NULL, 1, 1, 0,
-                                true);
+        he = __hists__add_entry(hists, al, NULL, NULL, NULL, 1, 1, 0, true);
         if (he == NULL)
                 return -ENOMEM;
 
         ret = hist_entry__inc_addr_samples(he, evsel->idx, al->addr);
-        hists__inc_nr_samples(&evsel->hists, true);
+        hists__inc_nr_samples(hists, true);
         return ret;
 }
 
@@ -225,7 +225,7 @@ static int __cmd_annotate(struct perf_annotate *ann)
 
         total_nr_samples = 0;
         evlist__for_each(session->evlist, pos) {
-                struct hists *hists = &pos->hists;
+                struct hists *hists = evsel__hists(pos);
                 u32 nr_samples = hists->stats.nr_events[PERF_RECORD_SAMPLE];
 
                 if (nr_samples > 0) {