perf: Shrink hw_perf_event

Use hw_perf_event::period_left instead of hw_perf_event::remaining
and win back 8 bytes.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: paulus <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 6 insertions, 7 deletions

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 8ef4ba3bcb1f..1a6cdbf0d091 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4800,14 +4800,13 @@ static void perf_swevent_start_hrtimer(struct perf_event *event)
         hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
         hwc->hrtimer.function = perf_swevent_hrtimer;
         if (hwc->sample_period) {
-                u64 period;
+                s64 period = local64_read(&hwc->period_left);
 
-                if (hwc->remaining) {
-                        if (hwc->remaining < 0)
+                if (period) {
+                        if (period < 0)
                                 period = 10000;
-                        else
-                                period = hwc->remaining;
-                        hwc->remaining = 0;
+
+                        local64_set(&hwc->period_left, 0);
                 } else {
                         period = max_t(u64, 10000, hwc->sample_period);
                 }
@@ -4823,7 +4822,7 @@ static void perf_swevent_cancel_hrtimer(struct perf_event *event)
 
         if (hwc->sample_period) {
                 ktime_t remaining = hrtimer_get_remaining(&hwc->hrtimer);
-                hwc->remaining = ktime_to_ns(remaining);
+                local64_set(&hwc->period_left, ktime_to_ns(remaining));
 
                 hrtimer_cancel(&hwc->hrtimer);
         }