perf hists: Move locking to its call-sites

It's a preparation patch to eliminate unneeded locking in the perf
report path.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1368497347-9628-5-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 18 insertions, 17 deletions

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index d45bf9b0361d..63febd24e912 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -297,6 +297,7 @@ static int process_sample_event(struct perf_tool *tool,
 {
         struct perf_report *rep = container_of(tool, struct perf_report, tool);
         struct addr_location al;
+        int ret;
 
         if (perf_event__preprocess_sample(event, machine, &al, sample,
                                           rep->annotate_init) < 0) {
@@ -311,28 +312,29 @@ static int process_sample_event(struct perf_tool *tool,
         if (rep->cpu_list && !test_bit(sample->cpu, rep->cpu_bitmap))
                 return 0;
 
+        pthread_mutex_lock(&evsel->hists.lock);
+
         if (sort__mode == SORT_MODE__BRANCH) {
-                if (perf_report__add_branch_hist_entry(tool, &al, sample,
-                                                       evsel, machine)) {
+                ret = perf_report__add_branch_hist_entry(tool, &al, sample,
+                                                         evsel, machine);
+                if (ret < 0)
                         pr_debug("problem adding lbr entry, skipping event\n");
-                        return -1;
-                }
         } else if (rep->mem_mode == 1) {
-                if (perf_report__add_mem_hist_entry(tool, &al, sample,
-                                                    evsel, machine, event)) {
+                ret = perf_report__add_mem_hist_entry(tool, &al, sample,
+                                                      evsel, machine, event);
+                if (ret < 0)
                         pr_debug("problem adding mem entry, skipping event\n");
-                        return -1;
-                }
         } else {
                 if (al.map != NULL)
                         al.map->dso->hit = 1;
 
-                if (perf_evsel__add_hist_entry(evsel, &al, sample, machine)) {
+                ret = perf_evsel__add_hist_entry(evsel, &al, sample, machine);
+                if (ret < 0)
                         pr_debug("problem incrementing symbol period, skipping event\n");
-                        return -1;
-                }
         }
-        return 0;
+        pthread_mutex_unlock(&evsel->hists.lock);
+
+        return ret;
 }
 
 static int process_read_event(struct perf_tool *tool,
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 5cd41ec43ce1..c2c973476479 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -245,8 +245,11 @@ static struct hist_entry *perf_evsel__add_hist_entry(struct perf_evsel *evsel,
 {
         struct hist_entry *he;
 
+        pthread_mutex_lock(&evsel->hists.lock);
         he = __hists__add_entry(&evsel->hists, al, NULL, sample->period,
                                 sample->weight);
+        pthread_mutex_unlock(&evsel->hists.lock);
+
         if (he == NULL)
                 return NULL;
 
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 7e0fa628e9ab..b11a6cfdb414 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -347,8 +347,6 @@ static struct hist_entry *add_hist_entry(struct hists *hists,
         struct hist_entry *he;
         int cmp;
 
-        pthread_mutex_lock(&hists->lock);
-
         p = &hists->entries_in->rb_node;
 
         while (*p != NULL) {
@@ -394,14 +392,12 @@ static struct hist_entry *add_hist_entry(struct hists *hists,
 
         he = hist_entry__new(entry);
         if (!he)
-                goto out_unlock;
+                return NULL;
 
         rb_link_node(&he->rb_node_in, parent, p);
         rb_insert_color(&he->rb_node_in, hists->entries_in);
 out:
         hist_entry__add_cpumode_period(he, al->cpumode, period);
-out_unlock:
-        pthread_mutex_unlock(&hists->lock);
         return he;
 }