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// Copyright 2009 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 "unsafe"

// A MemStats records statistics about the memory allocator.
type MemStats struct {
        // General statistics.
        Alloc      uint64 // bytes allocated and still in use
        TotalAlloc uint64 // bytes allocated (even if freed)
        Sys        uint64 // bytes obtained from system (should be sum of XxxSys below)
        Lookups    uint64 // number of pointer lookups
        Mallocs    uint64 // number of mallocs
        Frees      uint64 // number of frees

        // Main allocation heap statistics.
        HeapAlloc   uint64 // bytes allocated and still in use
        HeapSys     uint64 // bytes obtained from system
        HeapIdle    uint64 // bytes in idle spans
        HeapInuse   uint64 // bytes in non-idle span
        HeapObjects uint64 // total number of allocated objects

        // Low-level fixed-size structure allocator statistics.
        //      Inuse is bytes used now.
        //      Sys is bytes obtained from system.
        StackInuse  uint64 // bootstrap stacks
        StackSys    uint64
        MSpanInuse  uint64 // mspan structures
        MSpanSys    uint64
        MCacheInuse uint64 // mcache structures
        MCacheSys   uint64
        BuckHashSys uint64 // profiling bucket hash table

        // Garbage collector statistics.
        NextGC       uint64
        PauseTotalNs uint64
        PauseNs      [256]uint64 // most recent GC pause times
        NumGC        uint32
        EnableGC     bool
        DebugGC      bool

        // Per-size allocation statistics.
        // 61 is NumSizeClasses in the C code.
        BySize [61]struct {
                Size    uint32
                Mallocs uint64
                Frees   uint64
        }
}

var Sizeof_C_MStats uintptr // filled in by malloc.goc

var VmemStats MemStats

func init() {
        if Sizeof_C_MStats != unsafe.Sizeof(VmemStats) {
                println(Sizeof_C_MStats, unsafe.Sizeof(VmemStats))
                panic("MStats vs MemStatsType size mismatch")
        }
}

// ReadMemStats populates m with memory allocator statistics.
func ReadMemStats(m *MemStats)

// GC runs a garbage collection.
func GC()