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| author | Robin Murphy <robin.murphy@arm.com> | 2018-05-21 12:17:09 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-05-21 18:06:11 +0100 |
| commit | 5c591304e710339a75a9f0f9f3f085aa4109e55d (patch) | |
| tree | d6a2b19bd964f4f2fd6ed61e91a45cb38de0a76c | |
| parent | d0f2e423295313a30b1d56f3b24e9e927f0b66b7 (diff) | |
| download | linux-5c591304e710339a75a9f0f9f3f085aa4109e55d.tar.bz2 | |
perf/arm-cci: Remove unnecessary period adjustment
Since sampling events are rejected up-front by cci_pmu_event_init(), it
doesn't make much sense to go fiddling with the sampling period later.
This would seem to be just another leftover artefact of the arm_pmu
framwork, and as such can go.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
| -rw-r--r-- | drivers/perf/arm-cci.c | 9 |
1 files changed, 0 insertions, 9 deletions
diff --git a/drivers/perf/arm-cci.c b/drivers/perf/arm-cci.c index 383b2d3dcbc6..72c464485470 100644 --- a/drivers/perf/arm-cci.c +++ b/drivers/perf/arm-cci.c @@ -1304,15 +1304,6 @@ static int __hw_perf_event_init(struct perf_event *event) */ hwc->config_base |= (unsigned long)mapping; - /* - * Limit the sample_period to half of the counter width. That way, the - * new counter value is far less likely to overtake the previous one - * unless you have some serious IRQ latency issues. - */ - hwc->sample_period = CCI_PMU_CNTR_MASK >> 1; - hwc->last_period = hwc->sample_period; - local64_set(&hwc->period_left, hwc->sample_period); - if (event->group_leader != event) { if (validate_group(event) != 0) return -EINVAL; |