mirror of
https://github.com/golang/go
synced 2024-11-19 20:54:39 -07:00
5c598d3c9f
Periodically browse MHeap's freelists for long unused spans and release them if any.
Current hardcoded settings:
- GC is forced if none occured over the last 2 minutes.
- spans are handed back after 5 minutes of uselessness.
SysUnused (for Unix) is a wrapper on madvise MADV_DONTNEED on Linux and MADV_FREE on BSDs.
R=rsc, dvyukov, remyoudompheng
CC=golang-dev
https://golang.org/cl/5451057
72 lines
2.1 KiB
Go
72 lines
2.1 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime
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import "unsafe"
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// A MemStats records statistics about the memory allocator.
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type MemStats struct {
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// General statistics.
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Alloc uint64 // bytes allocated and still in use
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TotalAlloc uint64 // bytes allocated (even if freed)
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Sys uint64 // bytes obtained from system (should be sum of XxxSys below)
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Lookups uint64 // number of pointer lookups
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Mallocs uint64 // number of mallocs
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Frees uint64 // number of frees
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// Main allocation heap statistics.
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HeapAlloc uint64 // bytes allocated and still in use
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HeapSys uint64 // bytes obtained from system
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HeapIdle uint64 // bytes in idle spans
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HeapInuse uint64 // bytes in non-idle span
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HeapReleased uint64 // bytes released to the OS
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HeapObjects uint64 // total number of allocated objects
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// Low-level fixed-size structure allocator statistics.
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// Inuse is bytes used now.
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// Sys is bytes obtained from system.
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StackInuse uint64 // bootstrap stacks
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StackSys uint64
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MSpanInuse uint64 // mspan structures
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MSpanSys uint64
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MCacheInuse uint64 // mcache structures
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MCacheSys uint64
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BuckHashSys uint64 // profiling bucket hash table
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// Garbage collector statistics.
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NextGC uint64 // next run in HeapAlloc time (bytes)
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LastGC uint64 // last run in absolute time (ns)
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PauseTotalNs uint64
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PauseNs [256]uint64 // most recent GC pause times
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NumGC uint32
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EnableGC bool
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DebugGC bool
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// Per-size allocation statistics.
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// 61 is NumSizeClasses in the C code.
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BySize [61]struct {
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Size uint32
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Mallocs uint64
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Frees uint64
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}
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}
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var sizeof_C_MStats uintptr // filled in by malloc.goc
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var memStats MemStats
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func init() {
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if sizeof_C_MStats != unsafe.Sizeof(memStats) {
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println(sizeof_C_MStats, unsafe.Sizeof(memStats))
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panic("MStats vs MemStatsType size mismatch")
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}
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}
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// ReadMemStats populates m with memory allocator statistics.
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func ReadMemStats(m *MemStats)
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// GC runs a garbage collection.
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func GC()
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