perf: Add perf_event_count()

Create a helper function for those sites that want to read the event count.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 11 insertions, 6 deletions

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index f75c9c9c8177..ab4c0ffc271c 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -1736,6 +1736,11 @@ static void __perf_event_read(void *info)
         event->pmu->read(event);
 }
 
+static inline u64 perf_event_count(struct perf_event *event)
+{
+        return atomic64_read(&event->count);
+}
+
 static u64 perf_event_read(struct perf_event *event)
 {
         /*
@@ -1755,7 +1760,7 @@ static u64 perf_event_read(struct perf_event *event)
                 raw_spin_unlock_irqrestore(&ctx->lock, flags);
         }
 
-        return atomic64_read(&event->count);
+        return perf_event_count(event);
 }
 
 /*
@@ -2352,7 +2357,7 @@ void perf_event_update_userpage(struct perf_event *event)
         ++userpg->lock;
         barrier();
         userpg->index = perf_event_index(event);
-        userpg->offset = atomic64_read(&event->count);
+        userpg->offset = perf_event_count(event);
         if (event->state == PERF_EVENT_STATE_ACTIVE)
                 userpg->offset -= atomic64_read(&event->hw.prev_count);
 
@@ -3211,7 +3216,7 @@ static void perf_output_read_one(struct perf_output_handle *handle,
         u64 values[4];
         int n = 0;
 
-        values[n++] = atomic64_read(&event->count);
+        values[n++] = perf_event_count(event);
         if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
                 values[n++] = event->total_time_enabled +
                         atomic64_read(&event->child_total_time_enabled);
@@ -3248,7 +3253,7 @@ static void perf_output_read_group(struct perf_output_handle *handle,
         if (leader != event)
                 leader->pmu->read(leader);
 
-        values[n++] = atomic64_read(&leader->count);
+        values[n++] = perf_event_count(leader);
         if (read_format & PERF_FORMAT_ID)
                 values[n++] = primary_event_id(leader);
 
@@ -3260,7 +3265,7 @@ static void perf_output_read_group(struct perf_output_handle *handle,
                 if (sub != event)
                         sub->pmu->read(sub);
 
-                values[n++] = atomic64_read(&sub->count);
+                values[n++] = perf_event_count(sub);
                 if (read_format & PERF_FORMAT_ID)
                         values[n++] = primary_event_id(sub);
 
@@ -5369,7 +5374,7 @@ static void sync_child_event(struct perf_event *child_event,
         if (child_event->attr.inherit_stat)
                 perf_event_read_event(child_event, child);
 
-        child_val = atomic64_read(&child_event->count);
+        child_val = perf_event_count(child_event);
 
         /*
          * Add back the child's count to the parent's count: