PauseQuantiles []time.Duration
}

// ReadGCStats reads statistics about garbage collection into stats.
// The number of entries in the pause history is system-dependent;
// stats.Pause slice will be reused if large enough, reallocated otherwise.
// ReadGCStats may use the full capacity of the stats.Pause slice.
// If stats.PauseQuantiles is non-empty, ReadGCStats fills it with quantiles

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package debug

import (
	"time"
)

// Implemented in package runtime.
func readGCStats(*[]time.Duration)
func freeOSMemory()
func setMaxStack(int) int
func setGCPercent(int32) int32
func setPanicOnFault(bool) bool
func setMaxThreads(int) int

	var mstats runtime.MemStats
	var min, max time.Duration

	// First ReadGCStats will allocate, second should not,
	// especially if we follow up with an explicit garbage collection.
	stats.PauseQuantiles = make([]time.Duration, 10)
	ReadGCStats(&stats)
	runtime.GC()

	// Assume these will return same data: no GC during ReadGCStats.
	ReadGCStats(&stats)
	runtime.ReadMemStats(&mstats)

	if stats.NumGC != int64(mstats.NumGC) {

	gcStats := debug.GCStats{
		// If stats.PauseQuantiles is non-empty, ReadGCStats fills
		// it with quantiles summarizing the distribution of pause time.
		// For example, if len(stats.PauseQuantiles) is 5, it will be
		// filled with the minimum, 25%, 50%, 75%, and maximum pause times.
		PauseQuantiles: make([]time.Duration, 5),
	}
	debug.ReadGCStats(&gcStats)
	// Truncate GC stats to max 5 entries.
	if len(gcStats.PauseEnd) > 5 {

	// compatibility issues. copy will copy the minimum amount
	// of values between the two of them.
	copy(stats.BySize[:], bySize[:])
}

//go:linkname readGCStats runtime/debug.readGCStats
func readGCStats(pauses *[]uint64) {
	systemstack(func() {
		readGCStats_m(pauses)
	})
}

// readGCStats_m must be called on the system stack because it acquires the heap

/*
Package metrics provides a stable interface to access implementation-defined
metrics exported by the Go runtime. This package is similar to existing functions
like [runtime.ReadMemStats] and [runtime/debug.ReadGCStats], but significantly more general.

The set of metrics defined by this package may evolve as the runtime itself
evolves, and also enables variation across Go implementations, whose relevant
metric sets may not intersect.

		{"Module.Replace", Field, 12},
		{"Module.Sum", Field, 12},
		{"Module.Version", Field, 12},
		{"ParseBuildInfo", Func, 18},
		{"PrintStack", Func, 0},
		{"ReadBuildInfo", Func, 12},
		{"ReadGCStats", Func, 1},
		{"SetGCPercent", Func, 1},
		{"SetMaxStack", Func, 2},
		{"SetMaxThreads", Func, 2},
		{"SetMemoryLimit", Func, 19},
		{"SetPanicOnFault", Func, 3},
		{"SetTraceback", Func, 6},

pkg runtime, type BlockProfileRecord struct, Cycles int64
pkg runtime, type BlockProfileRecord struct, embedded StackRecord
pkg runtime/debug, func FreeOSMemory()
pkg runtime/debug, func ReadGCStats(*GCStats)
pkg runtime/debug, func SetGCPercent(int) int
pkg runtime/debug, type GCStats struct
pkg runtime/debug, type GCStats struct, LastGC time.Time
pkg runtime/debug, type GCStats struct, NumGC int64