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| author | Sébastien Paolacci <sebastien.paolacci@gmail.com> | 2012-02-16 13:30:04 -0500 |
|---|---|---|
| committer | Russ Cox <rsc@golang.org> | 2012-02-16 13:30:04 -0500 |
| commit | 5c598d3c9f0b9d78f92ffe1ab5a2365fe900c631 (patch) | |
| tree | 56aba77cf4a776ad909654548a6383ab19a0a08f /src/pkg/runtime/malloc.h | |
| parent | 85d33918a0c4ad56b2f40b052963e2c1dafb7014 (diff) | |
| download | go-5c598d3c9f0b9d78f92ffe1ab5a2365fe900c631.tar.xz | |
runtime: release unused memory to the OS.
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
Diffstat (limited to 'src/pkg/runtime/malloc.h')
| -rw-r--r-- | src/pkg/runtime/malloc.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/pkg/runtime/malloc.h b/src/pkg/runtime/malloc.h index d79c86d124..5f03693f52 100644 --- a/src/pkg/runtime/malloc.h +++ b/src/pkg/runtime/malloc.h @@ -205,6 +205,7 @@ struct MStats uint64 heap_sys; // bytes obtained from system uint64 heap_idle; // bytes in idle spans uint64 heap_inuse; // bytes in non-idle spans + uint64 heap_released; // bytes released to the OS uint64 heap_objects; // total number of allocated objects // Statistics about allocation of low-level fixed-size structures. @@ -220,6 +221,7 @@ struct MStats // Statistics about garbage collector. // Protected by stopping the world during GC. uint64 next_gc; // next GC (in heap_alloc time) + uint64 last_gc; // last GC (in absolute time) uint64 pause_total_ns; uint64 pause_ns[256]; uint32 numgc; @@ -304,14 +306,16 @@ struct MSpan { MSpan *next; // in a span linked list MSpan *prev; // in a span linked list - MSpan *allnext; // in the list of all spans + MSpan *allnext; // in the list of all spans PageID start; // starting page number uintptr npages; // number of pages in span MLink *freelist; // list of free objects uint32 ref; // number of allocated objects in this span uint32 sizeclass; // size class uint32 state; // MSpanInUse etc - byte *limit; // end of data in span + int64 unusedsince; // First time spotted by GC in MSpanFree state + uintptr npreleased; // number of pages released to the OS + byte *limit; // end of data in span }; void runtime·MSpan_Init(MSpan *span, PageID start, uintptr npages); @@ -381,6 +385,7 @@ MSpan* runtime·MHeap_LookupMaybe(MHeap *h, void *v); void runtime·MGetSizeClassInfo(int32 sizeclass, uintptr *size, int32 *npages, int32 *nobj); void* runtime·MHeap_SysAlloc(MHeap *h, uintptr n); void runtime·MHeap_MapBits(MHeap *h); +void runtime·MHeap_Scavenger(void); void* runtime·mallocgc(uintptr size, uint32 flag, int32 dogc, int32 zeroed); int32 runtime·mlookup(void *v, byte **base, uintptr *size, MSpan **s); |