ARM: 6835/1: perf: ensure overflows aren't missed due to IRQ latency

If a counter overflows during a perf stat profiling run it may overtake
the last known value of the counter:

    0        prev     new                0xffffffff
    |----------|-------|----------------------|

In this case, the number of events that have occurred is
(0xffffffff - prev) + new. Unfortunately, the event update code will
not realise an overflow has occurred and will instead report the event
delta as (new - prev) which may be considerably smaller than the real
count.

This patch adds an extra argument to armpmu_event_update which indicates
whether or not an overflow has occurred. If an overflow has occurred
then we use the maximum period of the counter to calculate the elapsed
events.

Acked-by: Jamie Iles <jamie@jamieiles.com>
Reported-by: Ashwin Chaugule <ashwinc@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index e422f4c..69cfee0 100644 (file)
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -205,11 +205,9 @@ armpmu_event_set_period(struct perf_event *event,
 static u64
 armpmu_event_update(struct perf_event *event,
                    struct hw_perf_event *hwc,
-                   int idx)
+                   int idx, int overflow)
 {
-       int shift = 64 - 32;
-       s64 prev_raw_count, new_raw_count;
-       u64 delta;
+       u64 delta, prev_raw_count, new_raw_count;
 
 again:
        prev_raw_count = local64_read(&hwc->prev_count);
@@ -219,8 +217,13 @@ again:
                             new_raw_count) != prev_raw_count)
                goto again;
 
-       delta = (new_raw_count << shift) - (prev_raw_count << shift);
-       delta >>= shift;
+       new_raw_count &= armpmu->max_period;
+       prev_raw_count &= armpmu->max_period;
+
+       if (overflow)
+               delta = armpmu->max_period - prev_raw_count + new_raw_count;
+       else
+               delta = new_raw_count - prev_raw_count;
 
        local64_add(delta, &event->count);
        local64_sub(delta, &hwc->period_left);
@@ -237,7 +240,7 @@ armpmu_read(struct perf_event *event)
        if (hwc->idx < 0)
                return;
 
-       armpmu_event_update(event, hwc, hwc->idx);
+       armpmu_event_update(event, hwc, hwc->idx, 0);
 }
 
 static void
@@ -255,7 +258,7 @@ armpmu_stop(struct perf_event *event, int flags)
        if (!(hwc->state & PERF_HES_STOPPED)) {
                armpmu->disable(hwc, hwc->idx);
                barrier(); /* why? */
-               armpmu_event_update(event, hwc, hwc->idx);
+               armpmu_event_update(event, hwc, hwc->idx, 0);
                hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
        }
 }

diff --git a/arch/arm/kernel/perf_event_v6.c b/arch/arm/kernel/perf_event_v6.c
index 6fc2d22..f1e8dd9 100644 (file)
--- a/arch/arm/kernel/perf_event_v6.c
+++ b/arch/arm/kernel/perf_event_v6.c
@@ -474,7 +474,7 @@ armv6pmu_handle_irq(int irq_num,
                        continue;
 
                hwc = &event->hw;
-               armpmu_event_update(event, hwc, idx);
+               armpmu_event_update(event, hwc, idx, 1);
                data.period = event->hw.last_period;
                if (!armpmu_event_set_period(event, hwc, idx))
                        continue;

diff --git a/arch/arm/kernel/perf_event_v7.c b/arch/arm/kernel/perf_event_v7.c
index c08d07a..4960686 100644 (file)
--- a/arch/arm/kernel/perf_event_v7.c
+++ b/arch/arm/kernel/perf_event_v7.c
@@ -782,7 +782,7 @@ static irqreturn_t armv7pmu_handle_irq(int irq_num, void *dev)
                        continue;
 
                hwc = &event->hw;
-               armpmu_event_update(event, hwc, idx);
+               armpmu_event_update(event, hwc, idx, 1);
                data.period = event->hw.last_period;
                if (!armpmu_event_set_period(event, hwc, idx))
                        continue;

diff --git a/arch/arm/kernel/perf_event_xscale.c b/arch/arm/kernel/perf_event_xscale.c
index 28cd3b0..39affbe 100644 (file)
--- a/arch/arm/kernel/perf_event_xscale.c
+++ b/arch/arm/kernel/perf_event_xscale.c
@@ -246,7 +246,7 @@ xscale1pmu_handle_irq(int irq_num, void *dev)
                        continue;
 
                hwc = &event->hw;
-               armpmu_event_update(event, hwc, idx);
+               armpmu_event_update(event, hwc, idx, 1);
                data.period = event->hw.last_period;
                if (!armpmu_event_set_period(event, hwc, idx))
                        continue;
@@ -578,7 +578,7 @@ xscale2pmu_handle_irq(int irq_num, void *dev)
                        continue;
 
                hwc = &event->hw;
-               armpmu_event_update(event, hwc, idx);
+               armpmu_event_update(event, hwc, idx, 1);
                data.period = event->hw.last_period;
                if (!armpmu_event_set_period(event, hwc, idx))
                        continue;