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https://github.com/golang/go
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a33ef8d11b
Currently lots of sys allocations are not accounted in any of XxxSys, including GC bitmap, spans table, GC roots blocks, GC finalizer blocks, iface table, netpoll descriptors and more. Up to ~20% can unaccounted. This change introduces 2 new stats: GCSys and OtherSys for GC metadata and all other misc allocations, respectively. Also ensures that all XxxSys indeed sum up to Sys. All sys memory allocation functions require the stat for accounting, so that it's impossible to miss something. Also fix updating of mcache_sys/inuse, they were not updated after deallocation. test/bench/garbage/parser before: Sys 670064344 HeapSys 610271232 StackSys 65536 MSpanSys 14204928 MCacheSys 16384 BuckHashSys 1439992 after: Sys 670064344 HeapSys 610271232 StackSys 65536 MSpanSys 14188544 MCacheSys 16384 BuckHashSys 3194304 GCSys 39198688 OtherSys 3129656 Fixes #5799. R=rsc, dave, alex.brainman CC=golang-dev https://golang.org/cl/12946043
65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
// 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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// Fixed-size object allocator. Returned memory is not zeroed.
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//
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// See malloc.h for overview.
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#include "runtime.h"
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#include "arch_GOARCH.h"
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#include "malloc.h"
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// Initialize f to allocate objects of the given size,
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// using the allocator to obtain chunks of memory.
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void
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runtime·FixAlloc_Init(FixAlloc *f, uintptr size, void (*first)(void*, byte*), void *arg, uint64 *stat)
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{
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f->size = size;
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f->first = first;
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f->arg = arg;
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f->list = nil;
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f->chunk = nil;
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f->nchunk = 0;
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f->inuse = 0;
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f->stat = stat;
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}
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void*
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runtime·FixAlloc_Alloc(FixAlloc *f)
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{
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void *v;
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if(f->size == 0) {
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runtime·printf("runtime: use of FixAlloc_Alloc before FixAlloc_Init\n");
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runtime·throw("runtime: internal error");
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}
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if(f->list) {
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v = f->list;
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f->list = *(void**)f->list;
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f->inuse += f->size;
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return v;
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}
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if(f->nchunk < f->size) {
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f->chunk = runtime·persistentalloc(FixAllocChunk, 0, f->stat);
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f->nchunk = FixAllocChunk;
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}
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v = f->chunk;
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if(f->first)
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f->first(f->arg, v);
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f->chunk += f->size;
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f->nchunk -= f->size;
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f->inuse += f->size;
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return v;
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}
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void
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runtime·FixAlloc_Free(FixAlloc *f, void *p)
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{
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f->inuse -= f->size;
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*(void**)p = f->list;
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f->list = p;
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}
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