mirror of
https://github.com/golang/go
synced 2024-11-12 08:50:22 -07:00
runtime: use manual stack for garbage collection
Old code was using recursion to traverse object graph. New code uses an explicit stack, cutting the per-pointer footprint to two words during the recursion and avoiding the standard allocator and stack splitting code. in test/garbage: Reduces parser runtime by 2-3% Reduces Peano runtime by 40% Increases tree runtime by 4-5% R=r CC=golang-dev https://golang.org/cl/2150042
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@ -42,6 +42,13 @@ TEXT ·mmap(SB),7,$0
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CALL notok(SB)
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RET
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TEXT ·munmap(SB),7,$0
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MOVL $73, AX
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INT $0x80
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JAE 2(PC)
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CALL notok(SB)
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RET
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// void gettime(int64 *sec, int32 *usec)
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TEXT gettime(SB), 7, $32
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LEAL 12(SP), AX // must be non-nil, unused
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@ -107,6 +107,15 @@ TEXT ·mmap(SB),7,$0
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CALL notok(SB)
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RET
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TEXT ·munmap(SB),7,$0
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MOVQ 8(SP), DI // arg 1 addr
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MOVQ 16(SP), SI // arg 2 len
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MOVL $(0x2000000+73), AX // syscall entry
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SYSCALL
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JCC 2(PC)
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CALL notok(SB)
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RET
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TEXT notok(SB),7,$0
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MOVL $0xf1, BP
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MOVQ BP, (BP)
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@ -21,8 +21,6 @@ SysUnused(void *v, uintptr n)
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void
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SysFree(void *v, uintptr n)
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{
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USED(v);
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USED(n);
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// TODO(rsc): call munmap
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runtime_munmap(v, n);
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}
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@ -36,10 +36,11 @@ type MemStatsType struct {
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Mallocs uint64 // number of mallocs
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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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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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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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@ -84,6 +84,13 @@ TEXT ·mmap(SB),7,$32
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CALL notok(SB)
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RET
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TEXT ·munmap(SB),7,$-4
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MOVL $73, AX
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INT $0x80
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JAE 2(PC)
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CALL notok(SB)
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RET
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TEXT gettime(SB), 7, $32
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MOVL $116, AX
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LEAL 12(SP), BX
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@ -116,6 +116,15 @@ TEXT ·mmap(SB),7,$0
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CALL notok(SB)
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RET
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TEXT ·munmap(SB),7,$0
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MOVQ 8(SP), DI // arg 1 addr
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MOVQ 16(SP), SI // arg 2 len
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MOVL $73, AX
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SYSCALL
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JCC 2(PC)
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CALL notok(SB)
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RET
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TEXT notok(SB),7,$-8
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MOVL $0xf1, BP
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MOVQ BP, (BP)
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@ -21,8 +21,6 @@ SysUnused(void *v, uintptr n)
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void
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SysFree(void *v, uintptr n)
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{
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USED(v);
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USED(n);
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// TODO(rsc): call munmap
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runtime_munmap(v, n);
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}
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@ -110,6 +110,16 @@ TEXT ·mmap(SB),7,$0
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INCL AX
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RET
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TEXT ·munmap(SB),7,$0
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MOVL $91, AX // munmap
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MOVL 4(SP), BX
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MOVL 8(SP), CX
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INT $0x80
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CMPL AX, $0xfffff001
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JLS 2(PC)
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INT $3
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RET
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// int32 futex(int32 *uaddr, int32 op, int32 val,
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// struct timespec *timeout, int32 *uaddr2, int32 val2);
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TEXT futex(SB),7,$0
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@ -100,7 +100,7 @@ TEXT ·mmap(SB),7,$0
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MOVL 32(SP), R8
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MOVL 36(SP), R9
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MOVL $9, AX // syscall entry
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MOVL $9, AX // mmap
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SYSCALL
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CMPQ AX, $0xfffffffffffff001
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JLS 3(PC)
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@ -108,6 +108,16 @@ TEXT ·mmap(SB),7,$0
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INCQ AX
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RET
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TEXT munmap(SB),7,$0
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MOVQ 8(SP), DI
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MOVQ 16(SP), SI
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MOVQ $11, AX // munmap
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SYSCALL
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CMPQ AX, $0xfffffffffffff001
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JLS 2(PC)
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CALL notok(SB)
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RET
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TEXT notok(SB),7,$0
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MOVQ $0xf1, BP
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MOVQ BP, (BP)
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@ -25,6 +25,7 @@
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#define SYS_gettid (SYS_BASE + 224)
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#define SYS_futex (SYS_BASE + 240)
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#define SYS_exit_group (SYS_BASE + 248)
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#define SYS_munmap (SYS_BASE + 91)
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#define ARM_BASE (SYS_BASE + 0x0f0000)
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#define SYS_ARM_cacheflush (ARM_BASE + 2)
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@ -64,6 +65,13 @@ TEXT ·mmap(SB),7,$0
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SWI $0
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RET
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TEXT ·mmap(SB),7,$0
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MOVW 0(FP), R0
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MOVW 4(FP), R1
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MOVW $SYS_munmap, R7
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SWI $0
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RET
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TEXT gettime(SB),7,$32
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/* dummy version - return 0,0 */
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MOVW $0, R1
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@ -33,8 +33,6 @@ SysUnused(void *v, uintptr n)
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void
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SysFree(void *v, uintptr n)
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{
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USED(v);
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USED(n);
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// TODO(rsc): call munmap
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runtime_munmap(v, n);
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}
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@ -183,6 +183,7 @@ struct MStats
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uint64 heap_sys; // bytes obtained from system
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uint64 heap_idle; // bytes in idle spans
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uint64 heap_inuse; // bytes in non-idle spans
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uint64 heap_objects; // total number of allocated objects
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// Statistics about allocation of low-level fixed-size structures.
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// Protected by FixAlloc locks.
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@ -251,6 +252,7 @@ struct MCache
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MCacheList list[NumSizeClasses];
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uint64 size;
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int64 local_alloc; // bytes allocated (or freed) since last lock of heap
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int64 local_objects; // objects allocated (or freed) since last lock of heap
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int32 next_sample; // trigger heap sample after allocating this many bytes
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};
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@ -47,6 +47,7 @@ MCache_Alloc(MCache *c, int32 sizeclass, uintptr size, int32 zeroed)
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}
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}
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c->local_alloc += size;
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c->local_objects++;
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return v;
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}
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@ -88,6 +89,7 @@ MCache_Free(MCache *c, void *v, int32 sizeclass, uintptr size)
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l->nlist++;
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c->size += size;
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c->local_alloc -= size;
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c->local_objects--;
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if(l->nlist >= MaxMCacheListLen) {
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// Release a chunk back.
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@ -121,11 +123,6 @@ MCache_ReleaseAll(MCache *c)
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int32 i;
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MCacheList *l;
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lock(&mheap);
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mstats.heap_alloc += c->local_alloc;
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c->local_alloc = 0;
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unlock(&mheap);
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for(i=0; i<NumSizeClasses; i++) {
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l = &c->list[i];
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ReleaseN(c, l, l->nlist, i);
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@ -19,6 +19,13 @@ enum {
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Debug = 0
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};
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typedef struct BlockList BlockList;
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struct BlockList
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{
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byte *obj;
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uintptr size;
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};
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extern byte data[];
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extern byte etext[];
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extern byte end[];
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@ -26,6 +33,7 @@ extern byte end[];
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static G *fing;
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static Finalizer *finq;
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static int32 fingwait;
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static BlockList *bl, *ebl;
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static void runfinq(void);
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@ -34,7 +42,7 @@ enum {
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};
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static void
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scanblock(int32 depth, byte *b, int64 n)
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scanblock(byte *b, int64 n)
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{
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int32 off;
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void *obj;
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@ -42,48 +50,65 @@ scanblock(int32 depth, byte *b, int64 n)
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uint32 *refp, ref;
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void **vp;
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int64 i;
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BlockList *w;
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if(Debug > 1)
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printf("%d scanblock %p %D\n", depth, b, n);
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off = (uint32)(uintptr)b & (PtrSize-1);
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if(off) {
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b += PtrSize - off;
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n -= PtrSize - off;
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}
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w = bl;
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w->obj = b;
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w->size = n;
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w++;
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vp = (void**)b;
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n /= PtrSize;
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for(i=0; i<n; i++) {
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obj = vp[i];
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if(obj == nil)
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continue;
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if(mheap.closure_min != nil && mheap.closure_min <= (byte*)obj && (byte*)obj < mheap.closure_max) {
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if((((uintptr)obj) & 63) != 0)
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continue;
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while(w > bl) {
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w--;
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b = w->obj;
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n = w->size;
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// Looks like a Native Client closure.
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// Actual pointer is pointed at by address in first instruction.
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// Embedded pointer starts at byte 2.
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// If it is f4f4f4f4 then that space hasn't been
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// used for a closure yet (f4 is the HLT instruction).
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// See nacl/386/closure.c for more.
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void **pp;
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pp = *(void***)((byte*)obj+2);
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if(pp == (void**)0xf4f4f4f4) // HLT... - not a closure after all
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continue;
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obj = *pp;
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if(Debug > 1)
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printf("scanblock %p %D\n", b, n);
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off = (uint32)(uintptr)b & (PtrSize-1);
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if(off) {
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b += PtrSize - off;
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n -= PtrSize - off;
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}
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if(mheap.min <= (byte*)obj && (byte*)obj < mheap.max) {
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if(mlookup(obj, &obj, &size, nil, &refp)) {
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ref = *refp;
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switch(ref & ~RefFlags) {
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case RefNone:
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if(Debug > 1)
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printf("%d found at %p: ", depth, &vp[i]);
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*refp = RefSome | (ref & RefFlags);
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if(!(ref & RefNoPointers))
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scanblock(depth+1, obj, size);
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break;
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vp = (void**)b;
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n /= PtrSize;
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for(i=0; i<n; i++) {
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obj = vp[i];
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if(obj == nil)
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continue;
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if(mheap.closure_min != nil && mheap.closure_min <= (byte*)obj && (byte*)obj < mheap.closure_max) {
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if((((uintptr)obj) & 63) != 0)
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continue;
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// Looks like a Native Client closure.
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// Actual pointer is pointed at by address in first instruction.
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// Embedded pointer starts at byte 2.
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// If it is f4f4f4f4 then that space hasn't been
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// used for a closure yet (f4 is the HLT instruction).
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// See nacl/386/closure.c for more.
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void **pp;
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pp = *(void***)((byte*)obj+2);
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if(pp == (void**)0xf4f4f4f4) // HLT... - not a closure after all
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continue;
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obj = *pp;
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}
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if(mheap.min <= (byte*)obj && (byte*)obj < mheap.max) {
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if(mlookup(obj, &obj, &size, nil, &refp)) {
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ref = *refp;
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switch(ref & ~RefFlags) {
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case RefNone:
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if(Debug > 1)
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printf("found at %p: ", &vp[i]);
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*refp = RefSome | (ref & RefFlags);
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if(!(ref & RefNoPointers)) {
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if(w >= ebl)
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throw("scanblock: garbage collection stack overflow");
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w->obj = obj;
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w->size = size;
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w++;
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}
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break;
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}
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}
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}
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}
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@ -104,7 +129,7 @@ scanstack(G *gp)
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printf("scanstack %d %p\n", gp->goid, sp);
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stk = (Stktop*)gp->stackbase;
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while(stk) {
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scanblock(0, sp, (byte*)stk - sp);
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scanblock(sp, (byte*)stk - sp);
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sp = stk->gobuf.sp;
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stk = (Stktop*)stk->stackbase;
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}
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@ -122,19 +147,40 @@ markfin(void *v)
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throw("mark - finalizer inconsistency");
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// do not mark the finalizer block itself. just mark the things it points at.
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scanblock(1, v, size);
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scanblock(v, size);
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}
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static void
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mark(void)
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{
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G *gp;
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uintptr blsize, nobj;
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// Figure out how big an object stack we need.
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// Get a new one if we need more than we have
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// or we need significantly less than we have.
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nobj = mstats.heap_objects;
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if(nobj > ebl - bl || nobj < (ebl-bl)/4) {
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if(bl != nil)
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SysFree(bl, (byte*)ebl - (byte*)bl);
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// While we're allocated a new object stack,
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// add 20% headroom and also round up to
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// the nearest page boundary, since mmap
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// will anyway.
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nobj = nobj * 12/10;
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blsize = nobj * sizeof *bl;
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blsize = (blsize + 4095) & ~4095;
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nobj = blsize / sizeof *bl;
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bl = SysAlloc(blsize);
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ebl = bl + nobj;
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}
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// mark data+bss.
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// skip mheap itself, which has no interesting pointers
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// and is mostly zeroed and would not otherwise be paged in.
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scanblock(0, data, (byte*)&mheap - data);
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scanblock(0, (byte*)(&mheap+1), end - (byte*)(&mheap+1));
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scanblock(data, (byte*)&mheap - data);
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scanblock((byte*)(&mheap+1), end - (byte*)(&mheap+1));
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// mark stacks
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for(gp=allg; gp!=nil; gp=gp->alllink) {
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@ -276,6 +322,21 @@ stealcache(void)
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MCache_ReleaseAll(m->mcache);
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}
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static void
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cachestats(void)
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{
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M *m;
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MCache *c;
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for(m=allm; m; m=m->alllink) {
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c = m->mcache;
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mstats.heap_alloc += c->local_alloc;
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c->local_alloc = 0;
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mstats.heap_objects += c->local_objects;
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c->local_objects = 0;
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}
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}
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void
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gc(int32 force)
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{
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@ -313,6 +374,7 @@ gc(int32 force)
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if(mheap.Lock.key != 0)
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throw("mheap locked during gc");
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if(force || mstats.heap_alloc >= mstats.next_gc) {
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cachestats();
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mark();
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sweep();
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stealcache();
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|
@ -60,11 +60,15 @@ MHeap_Alloc(MHeap *h, uintptr npage, int32 sizeclass, int32 acct)
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lock(h);
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mstats.heap_alloc += m->mcache->local_alloc;
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m->mcache->local_alloc = 0;
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mstats.heap_objects += m->mcache->local_objects;
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m->mcache->local_objects = 0;
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s = MHeap_AllocLocked(h, npage, sizeclass);
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if(s != nil) {
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mstats.heap_inuse += npage<<PageShift;
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if(acct)
|
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if(acct) {
|
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mstats.heap_objects++;
|
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mstats.heap_alloc += npage<<PageShift;
|
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}
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}
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unlock(h);
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return s;
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@ -240,9 +244,13 @@ MHeap_Free(MHeap *h, MSpan *s, int32 acct)
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lock(h);
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mstats.heap_alloc += m->mcache->local_alloc;
|
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m->mcache->local_alloc = 0;
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mstats.heap_objects += m->mcache->local_objects;
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m->mcache->local_objects = 0;
|
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mstats.heap_inuse -= s->npages<<PageShift;
|
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if(acct)
|
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if(acct) {
|
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mstats.heap_alloc -= s->npages<<PageShift;
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mstats.heap_objects--;
|
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}
|
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MHeap_FreeLocked(h, s);
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unlock(h);
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}
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|
@ -11,6 +11,7 @@
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// http://code.google.com/p/nativeclient/source/browse/trunk/src/native_client/src/trusted/service_runtime/include/bits/nacl_syscalls.h
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#define SYS_exit 30
|
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#define SYS_mmap 21
|
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#define SYS_munmap 22
|
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#define SYS_thread_create 80
|
||||
#define SYS_thread_exit 81
|
||||
#define SYS_tls_init 82
|
||||
@ -91,6 +92,9 @@ TEXT ·mmap(SB),7,$24
|
||||
INT $3
|
||||
RET
|
||||
|
||||
TEXT ·munmap(SB),7,$0
|
||||
JMP SYSCALL(munmap)
|
||||
|
||||
TEXT gettime(SB),7,$32
|
||||
LEAL 8(SP), BX
|
||||
MOVL BX, 0(SP)
|
||||
|
@ -21,8 +21,6 @@ SysUnused(void *v, uintptr n)
|
||||
void
|
||||
SysFree(void *v, uintptr n)
|
||||
{
|
||||
USED(v);
|
||||
USED(n);
|
||||
// TODO(rsc): call munmap
|
||||
runtime_munmap(v, n);
|
||||
}
|
||||
|
||||
|
@ -498,6 +498,7 @@ void notewakeup(Note*);
|
||||
#define runtime_memclr ·memclr
|
||||
#define runtime_getcallerpc ·getcallerpc
|
||||
#define runtime_mmap ·mmap
|
||||
#define runtime_munmap ·munmap
|
||||
#define runtime_printslice ·printslice
|
||||
#define runtime_printbool ·printbool
|
||||
#define runtime_printfloat ·printfloat
|
||||
@ -524,6 +525,7 @@ void notewakeup(Note*);
|
||||
* low level go-called
|
||||
*/
|
||||
uint8* runtime_mmap(byte*, uintptr, int32, int32, int32, uint32);
|
||||
void runtime_munmap(uint8*, uintptr);
|
||||
void runtime_memclr(byte*, uint32);
|
||||
void runtime_setcallerpc(void*, void*);
|
||||
void* runtime_getcallerpc(void*);
|
||||
|
@ -8,21 +8,22 @@
|
||||
// Assume there's an arbitrary amount of memory starting at "end".
|
||||
// Sizing PC memory is beyond the scope of this demo.
|
||||
|
||||
static byte *allocp;
|
||||
|
||||
void*
|
||||
SysAlloc(uintptr ask)
|
||||
{
|
||||
static byte *p;
|
||||
extern byte end[];
|
||||
byte *q;
|
||||
|
||||
if(p == nil) {
|
||||
p = end;
|
||||
p += 7 & -(uintptr)p;
|
||||
if(allocp == nil) {
|
||||
allocp = end;
|
||||
allocp += 7 & -(uintptr)allocp;
|
||||
}
|
||||
ask += 7 & -ask;
|
||||
|
||||
q = p;
|
||||
p += ask;
|
||||
q = allocp;
|
||||
allocp += ask;
|
||||
·memclr(q, ask);
|
||||
return q;
|
||||
}
|
||||
@ -30,7 +31,11 @@ SysAlloc(uintptr ask)
|
||||
void
|
||||
SysFree(void *v, uintptr n)
|
||||
{
|
||||
USED(v, n);
|
||||
// Push pointer back if this is a free
|
||||
// of the most recent SysAlloc.
|
||||
n += 7 & -n;
|
||||
if(allocp == v+n)
|
||||
allocp -= n;
|
||||
}
|
||||
|
||||
void
|
||||
|
@ -7,10 +7,18 @@
|
||||
#include "defs.h"
|
||||
#include "malloc.h"
|
||||
|
||||
enum {
|
||||
MEM_COMMIT = 0x1000,
|
||||
MEM_RESERVE = 0x2000,
|
||||
MEM_RELEASE = 0x8000,
|
||||
|
||||
PAGE_EXECUTE_READWRITE = 0x40,
|
||||
};
|
||||
|
||||
void*
|
||||
SysAlloc(uintptr n)
|
||||
{
|
||||
return stdcall(VirtualAlloc, 4, nil, n, 0x3000, 0x40);
|
||||
return stdcall(VirtualAlloc, 4, nil, n, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
|
||||
}
|
||||
|
||||
void
|
||||
@ -23,7 +31,5 @@ SysUnused(void *v, uintptr n)
|
||||
void
|
||||
SysFree(void *v, uintptr n)
|
||||
{
|
||||
USED(v);
|
||||
USED(n);
|
||||
return stdcall(VirtualFree, 3, v, n, MEM_RELEASE);
|
||||
}
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user