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// Copyright 2020 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package runtime import ( "runtime/internal/atomic" "runtime/internal/sys" "unsafe" ) const ( // For the time histogram type, we use an HDR histogram. // Values are placed in buckets based solely on the most // significant set bit. Thus, buckets are power-of-2 sized. // Values are then placed into sub-buckets based on the value of // the next timeHistSubBucketBits most significant bits. Thus, // sub-buckets are linear within a bucket. // // Therefore, the number of sub-buckets (timeHistNumSubBuckets) // defines the error. This error may be computed as // 1/timeHistNumSubBuckets*100%. For example, for 16 sub-buckets // per bucket the error is approximately 6%. // // The number of buckets (timeHistNumBuckets), on the // other hand, defines the range. To avoid producing a large number // of buckets that are close together, especially for small numbers // (e.g. 1, 2, 3, 4, 5 ns) that aren't very useful, timeHistNumBuckets // is defined in terms of the least significant bit (timeHistMinBucketBits) // that needs to be set before we start bucketing and the most // significant bit (timeHistMaxBucketBits) that we bucket before we just // dump it into a catch-all bucket. // // As an example, consider the configuration: // // timeHistMinBucketBits = 9 // timeHistMaxBucketBits = 48 // timeHistSubBucketBits = 2 // // Then: // // 011000001 // ^-- // │ ^ // │ └---- Next 2 bits -> sub-bucket 3 // └------- Bit 9 unset -> bucket 0 // // 110000001 // ^-- // │ ^ // │ └---- Next 2 bits -> sub-bucket 2 // └------- Bit 9 set -> bucket 1 // // 1000000010 // ^-- ^ // │ ^ └-- Lower bits ignored // │ └---- Next 2 bits -> sub-bucket 0 // └------- Bit 10 set -> bucket 2 // // Following this pattern, bucket 38 will have the bit 46 set. We don't // have any buckets for higher values, so we spill the rest into an overflow // bucket containing values of 2^47-1 nanoseconds or approx. 1 day or more. // This range is more than enough to handle durations produced by the runtime. timeHistMinBucketBits = 9 timeHistMaxBucketBits = 48 // Note that this is exclusive; 1 higher than the actual range. timeHistSubBucketBits = 2 timeHistNumSubBuckets = 1 << timeHistSubBucketBits timeHistNumBuckets = timeHistMaxBucketBits - timeHistMinBucketBits + 1 // Two extra buckets, one for underflow, one for overflow. timeHistTotalBuckets = timeHistNumBuckets*timeHistNumSubBuckets + 2 ) // timeHistogram represents a distribution of durations in // nanoseconds. // // The accuracy and range of the histogram is defined by the // timeHistSubBucketBits and timeHistNumBuckets constants. // // It is an HDR histogram with exponentially-distributed // buckets and linearly distributed sub-buckets. // // The histogram is safe for concurrent reads and writes. type timeHistogram struct { counts [timeHistNumBuckets * timeHistNumSubBuckets]atomic.Uint64 // underflow counts all the times we got a negative duration // sample. Because of how time works on some platforms, it's // possible to measure negative durations. We could ignore them, // but we record them anyway because it's better to have some // signal that it's happening than just missing samples. underflow atomic.Uint64 // overflow counts all the times we got a duration that exceeded // the range counts represents. overflow atomic.Uint64 } // record adds the given duration to the distribution. // // Disallow preemptions and stack growths because this function // may run in sensitive locations. // //go:nosplit func (h *timeHistogram) record(duration int64) { // If the duration is negative, capture that in underflow. if duration < 0 { h.underflow.Add(1) return } // bucketBit is the target bit for the bucket which is usually the // highest 1 bit, but if we're less than the minimum, is the highest // 1 bit of the minimum (which will be zero in the duration). // // bucket is the bucket index, which is the bucketBit minus the // highest bit of the minimum, plus one to leave room for the catch-all // bucket for samples lower than the minimum. var bucketBit, bucket uint if l := sys.Len64(uint64(duration)); l < timeHistMinBucketBits { bucketBit = timeHistMinBucketBits bucket = 0 // bucketBit - timeHistMinBucketBits } else { bucketBit = uint(l) bucket = bucketBit - timeHistMinBucketBits + 1 } // If the bucket we computed is greater than the number of buckets, // count that in overflow. if bucket >= timeHistNumBuckets { h.overflow.Add(1) return } // The sub-bucket index is just next timeHistSubBucketBits after the bucketBit. subBucket := uint(duration>>(bucketBit-1-timeHistSubBucketBits)) % timeHistNumSubBuckets h.counts[bucket*timeHistNumSubBuckets+subBucket].Add(1) } // write dumps the histogram to the passed metricValue as a float64 histogram. func (h *timeHistogram) write(out *metricValue) { hist := out.float64HistOrInit(timeHistBuckets) // The bottom-most bucket, containing negative values, is tracked // separately as underflow, so fill that in manually and then iterate // over the rest. hist.counts[0] = h.underflow.Load() for i := range h.counts { hist.counts[i+1] = h.counts[i].Load() } hist.counts[len(hist.counts)-1] = h.overflow.Load() } const ( fInf = 0x7FF0000000000000 fNegInf = 0xFFF0000000000000 ) func float64Inf() float64 { inf := uint64(fInf) return *(*float64)(unsafe.Pointer(&inf)) } func float64NegInf() float64 { inf := uint64(fNegInf) return *(*float64)(unsafe.Pointer(&inf)) } // timeHistogramMetricsBuckets generates a slice of boundaries for // the timeHistogram. These boundaries are represented in seconds, // not nanoseconds like the timeHistogram represents durations. func timeHistogramMetricsBuckets() []float64 { b := make([]float64, timeHistTotalBuckets+1) // Underflow bucket. b[0] = float64NegInf() for j := 0; j < timeHistNumSubBuckets; j++ { // No bucket bit for the first few buckets. Just sub-bucket bits after the // min bucket bit. bucketNanos := uint64(j) << (timeHistMinBucketBits - 1 - timeHistSubBucketBits) // Convert nanoseconds to seconds via a division. // These values will all be exactly representable by a float64. b[j+1] = float64(bucketNanos) / 1e9 } // Generate the rest of the buckets. It's easier to reason // about if we cut out the 0'th bucket. for i := timeHistMinBucketBits; i < timeHistMaxBucketBits; i++ { for j := 0; j < timeHistNumSubBuckets; j++ { // Set the bucket bit. bucketNanos := uint64(1) << (i - 1) // Set the sub-bucket bits. bucketNanos |= uint64(j) << (i - 1 - timeHistSubBucketBits) // The index for this bucket is going to be the (i+1)'th bucket // (note that we're starting from zero, but handled the first bucket // earlier, so we need to compensate), and the j'th sub bucket. // Add 1 because we left space for -Inf. bucketIndex := (i-timeHistMinBucketBits+1)*timeHistNumSubBuckets + j + 1 // Convert nanoseconds to seconds via a division. // These values will all be exactly representable by a float64. b[bucketIndex] = float64(bucketNanos) / 1e9 } } // Overflow bucket. b[len(b)-2] = float64(uint64(1)<<(timeHistMaxBucketBits-1)) / 1e9 b[len(b)-1] = float64Inf() return b }