perf_counter: x86: Emulate longer sample periods

Do as Power already does, emulate sample periods up to 2^63-1 by
composing them of smaller values limited by hardware capabilities.
Only once we wrap the software period do we generate an overflow
event.

Just 10 lines of new code.

Reported-by: Stephane Eranian <eranian@googlemail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 9e144fb..904571b 100644 (file)
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -287,8 +287,7 @@ static int __hw_perf_counter_init(struct perf_counter *counter)
        if (!hwc->sample_period)
                hwc->sample_period = x86_pmu.max_period;
 
-       atomic64_set(&hwc->period_left,
-                       min(x86_pmu.max_period, hwc->sample_period));
+       atomic64_set(&hwc->period_left, hwc->sample_period);
 
        /*
         * Raw event type provide the config in the event structure
@@ -451,13 +450,13 @@ static DEFINE_PER_CPU(u64, prev_left[X86_PMC_IDX_MAX]);
  * Set the next IRQ period, based on the hwc->period_left value.
  * To be called with the counter disabled in hw:
  */
-static void
+static int
 x86_perf_counter_set_period(struct perf_counter *counter,
                             struct hw_perf_counter *hwc, int idx)
 {
        s64 left = atomic64_read(&hwc->period_left);
-       s64 period = min(x86_pmu.max_period, hwc->sample_period);
-       int err;
+       s64 period = hwc->sample_period;
+       int err, ret = 0;
 
        /*
         * If we are way outside a reasoable range then just skip forward:
@@ -465,11 +464,13 @@ x86_perf_counter_set_period(struct perf_counter *counter,
        if (unlikely(left <= -period)) {
                left = period;
                atomic64_set(&hwc->period_left, left);
+               ret = 1;
        }
 
        if (unlikely(left <= 0)) {
                left += period;
                atomic64_set(&hwc->period_left, left);
+               ret = 1;
        }
        /*
         * Quirk: certain CPUs dont like it if just 1 event is left:
@@ -477,6 +478,9 @@ x86_perf_counter_set_period(struct perf_counter *counter,
        if (unlikely(left < 2))
                left = 2;
 
+       if (left > x86_pmu.max_period)
+               left = x86_pmu.max_period;
+
        per_cpu(prev_left[idx], smp_processor_id()) = left;
 
        /*
@@ -487,6 +491,8 @@ x86_perf_counter_set_period(struct perf_counter *counter,
 
        err = checking_wrmsrl(hwc->counter_base + idx,
                             (u64)(-left) & x86_pmu.counter_mask);
+
+       return ret;
 }
 
 static inline void
@@ -706,16 +712,19 @@ static void x86_pmu_disable(struct perf_counter *counter)
  * Save and restart an expired counter. Called by NMI contexts,
  * so it has to be careful about preempting normal counter ops:
  */
-static void intel_pmu_save_and_restart(struct perf_counter *counter)
+static int intel_pmu_save_and_restart(struct perf_counter *counter)
 {
        struct hw_perf_counter *hwc = &counter->hw;
        int idx = hwc->idx;
+       int ret;
 
        x86_perf_counter_update(counter, hwc, idx);
-       x86_perf_counter_set_period(counter, hwc, idx);
+       ret = x86_perf_counter_set_period(counter, hwc, idx);
 
        if (counter->state == PERF_COUNTER_STATE_ACTIVE)
                intel_pmu_enable_counter(hwc, idx);
+
+       return ret;
 }
 
 static void intel_pmu_reset(void)
@@ -782,7 +791,9 @@ again:
                if (!test_bit(bit, cpuc->active_mask))
                        continue;
 
-               intel_pmu_save_and_restart(counter);
+               if (!intel_pmu_save_and_restart(counter))
+                       continue;
+
                if (perf_counter_overflow(counter, nmi, regs, 0))
                        intel_pmu_disable_counter(&counter->hw, bit);
        }
@@ -824,9 +835,11 @@ static int amd_pmu_handle_irq(struct pt_regs *regs, int nmi)
                        continue;
 
                /* counter overflow */
-               x86_perf_counter_set_period(counter, hwc, idx);
                handled = 1;
                inc_irq_stat(apic_perf_irqs);
+               if (!x86_perf_counter_set_period(counter, hwc, idx))
+                       continue;
+
                if (perf_counter_overflow(counter, nmi, regs, 0))
                        amd_pmu_disable_counter(hwc, idx);
        }