From: Andi Kleen <a...@linux.intel.com>
The recent change 75f80859b1 (... Robustify PEBS buffer drain)
causes lots of warnings on different CPUs before Skylake
when running PEBS intensive workloads.
They can have a zero status field in the PEBS record when
PEBS is racing with clearing of GLOBAl_STATUS.
This also can cause hangs (it seems there are still
problems with printk in NMI)
Disable the warning, but still ignore the record.
Signed-off-by: Andi Kleen <a...@linux.intel.com>
---
arch/x86/kernel/cpu/perf_event_intel_ds.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c
b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index 7f11784..da294de 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -1237,10 +1237,7 @@ static void intel_pmu_drain_pebs_nhm(struct pt_regs
*iregs)
bit = find_first_bit((unsigned long *)&pebs_status,
x86_pmu.max_pebs_events);
- if (WARN(bit >= x86_pmu.max_pebs_events,
- "PEBS record without PEBS event! status=%Lx
pebs_enabled=%Lx active_mask=%Lx",
- (unsigned long long)p->status, (unsigned long
long)cpuc->pebs_enabled,
- *(unsigned long long *)cpuc->active_mask))
+ if (bit >= x86_pmu.max_pebs_events)
continue;
/*
--
2.4.3
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