1 files changed, 69 insertions, 0 deletions
diff --git a/src/pkg/runtime/mem.go b/src/pkg/runtime/mem.go
new file mode 100644
index 000000000..fe505a329
--- /dev/null
+++ b/src/pkg/runtime/mem.go
@@ -0,0 +1,69 @@
+// 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"
+
+type MemStatsType struct {
+	// General statistics.
+	// Not locked during update; approximate.
+	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.
+	// Not locked during update; approximate.
+	// 61 is NumSizeClasses in the C code.
+	BySize [61]struct {
+		Size    uint32
+		Mallocs uint64
+		Frees   uint64
+	}
+}
+
+var sizeof_C_MStats int // filled in by malloc.goc
+
+func init() {
+	if sizeof_C_MStats != unsafe.Sizeof(MemStats) {
+		println(sizeof_C_MStats, unsafe.Sizeof(MemStats))
+		panic("MStats vs MemStatsType size mismatch")
+	}
+}
+
+// MemStats holds statistics about the memory system.
+// The statistics are only approximate, as they are not interlocked on update.
+var MemStats MemStatsType
+
+// GC runs a garbage collection.
+func GC()