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Internal change #641

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12 changes: 9 additions & 3 deletions tcmalloc/internal/numa.h
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Original file line number Diff line number Diff line change
Expand Up @@ -236,15 +236,19 @@ inline size_t NumaTopology<NumPartitions, ScaleBy>::GetCurrentPartition()
const {
if constexpr (NumPartitions == 1) return 0;
const int cpu = subtle::percpu::GetRealCpuUnsafe();
return gated_cpu_to_scaled_partition_[cpu + kNumaCpuFudge] / ScaleBy;
size_t idx = static_cast<size_t>(cpu + kNumaCpuFudge);
if (ABSL_PREDICT_FALSE(idx >= kCpuMapSize)) return 0;
return gated_cpu_to_scaled_partition_[idx] / ScaleBy;
}

template <size_t NumPartitions, size_t ScaleBy>
inline size_t NumaTopology<NumPartitions, ScaleBy>::GetCurrentScaledPartition()
const {
if constexpr (NumPartitions == 1) return 0;
const int cpu = subtle::percpu::GetRealCpuUnsafe();
return gated_cpu_to_scaled_partition_[cpu + kNumaCpuFudge];
size_t idx = static_cast<size_t>(cpu + kNumaCpuFudge);
if (ABSL_PREDICT_FALSE(idx >= kCpuMapSize)) return 0;
return gated_cpu_to_scaled_partition_[idx];
}

template <size_t NumPartitions, size_t ScaleBy>
Expand All @@ -256,7 +260,9 @@ inline size_t NumaTopology<NumPartitions, ScaleBy>::GetCpuPartition(
template <size_t NumPartitions, size_t ScaleBy>
inline size_t NumaTopology<NumPartitions, ScaleBy>::GetCpuScaledPartition(
const int cpu) const {
return cpu_to_scaled_partition_[cpu + kNumaCpuFudge];
size_t idx = static_cast<size_t>(cpu + kNumaCpuFudge);
if (ABSL_PREDICT_FALSE(idx >= kCpuMapSize)) return 0;
return cpu_to_scaled_partition_[idx];
}

template <size_t NumPartitions, size_t ScaleBy>
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