sparc: perf: fix updated event period in response to PERF_EVENT_IOC_PERIOD

The PERF_EVENT_IOC_PERIOD ioctl command can be used to change the
sample period of a running perf_event. Consequently, when calculating
the next event period, the new period will only be considered after the
previous one has overflowed.

This patch changes the calculation of the remaining event ticks so that
they are offset if the period has changed.

See commit 3581fe0ef37c ("ARM: 7556/1: perf: fix updated event period in
response to PERF_EVENT_IOC_PERIOD") for details.

Signed-off-by: Young Xiao <92siuyang@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index 6de7c684c29ff7ad0d65d51ebe319ee97faea777..a58ae9c428032be203f5f74de8c8729447f52e2a 100644 (file)
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -891,6 +891,10 @@ static int sparc_perf_event_set_period(struct perf_event *event,
        s64 period = hwc->sample_period;
        int ret = 0;
 
+       /* The period may have been changed by PERF_EVENT_IOC_PERIOD */
+       if (unlikely(period != hwc->last_period))
+               left = period - (hwc->last_period - left);
+
        if (unlikely(left <= -period)) {
                left = period;
                local64_set(&hwc->period_left, left);