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cmd/gc: allocate non-escaping maps on stack
Extend escape analysis to make(map[k]v). If it does not escape, allocate temp buffer for hmap and one bucket on stack. There are 75 cases of non-escaping maps in std lib. benchmark old allocs new allocs delta BenchmarkConcurrentStmtQuery 16161 15161 -6.19% BenchmarkConcurrentTxQuery 17658 16658 -5.66% BenchmarkConcurrentTxStmtQuery 16157 15156 -6.20% BenchmarkConcurrentRandom 13637 13114 -3.84% BenchmarkManyConcurrentQueries 22 20 -9.09% BenchmarkDecodeComplex128Slice 250 188 -24.80% BenchmarkDecodeFloat64Slice 250 188 -24.80% BenchmarkDecodeInt32Slice 250 188 -24.80% BenchmarkDecodeStringSlice 2250 2188 -2.76% BenchmarkNewEmptyMap 1 0 -100.00% BenchmarkNewSmallMap 2 0 -100.00% benchmark old ns/op new ns/op delta BenchmarkNewEmptyMap 124 55.7 -55.08% BenchmarkNewSmallMap 317 148 -53.31% benchmark old allocs new allocs delta BenchmarkNewEmptyMap 1 0 -100.00% BenchmarkNewSmallMap 2 0 -100.00% benchmark old bytes new bytes delta BenchmarkNewEmptyMap 48 0 -100.00% BenchmarkNewSmallMap 192 0 -100.00% Fixes #5449 Change-Id: I24fa66f949d2f138885d9e66a0d160240dc9e8fa Reviewed-on: https://go-review.googlesource.com/3508 Reviewed-by: Keith Randall <khr@golang.org> Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
This commit is contained in:
Dmitry Vyukov
parent
aed88be021
commit
b3be360f16
@ -65,7 +65,7 @@ char *runtimeimport =
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"func @\"\".efaceeq (@\"\".i1·2 any, @\"\".i2·3 any) (@\"\".ret·1 bool)\n"
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"func @\"\".ifacethash (@\"\".i1·2 any) (@\"\".ret·1 uint32)\n"
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"func @\"\".efacethash (@\"\".i1·2 any) (@\"\".ret·1 uint32)\n"
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"func @\"\".makemap (@\"\".mapType·2 *byte, @\"\".hint·3 int64) (@\"\".hmap·1 map[any]any)\n"
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"func @\"\".makemap (@\"\".mapType·2 *byte, @\"\".hint·3 int64, @\"\".mapbuf·4 *any, @\"\".bucketbuf·5 *any) (@\"\".hmap·1 map[any]any)\n"
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"func @\"\".mapaccess1 (@\"\".mapType·2 *byte, @\"\".hmap·3 map[any]any, @\"\".key·4 *any) (@\"\".val·1 *any)\n"
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"func @\"\".mapaccess1_fast32 (@\"\".mapType·2 *byte, @\"\".hmap·3 map[any]any, @\"\".key·4 any) (@\"\".val·1 *any)\n"
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"func @\"\".mapaccess1_fast64 (@\"\".mapType·2 *byte, @\"\".hmap·3 map[any]any, @\"\".key·4 any) (@\"\".val·1 *any)\n"
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@ -1321,7 +1321,9 @@ Sym* typenamesym(Type *t);
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Sym* tracksym(Type *t);
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Sym* typesymprefix(char *prefix, Type *t);
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int haspointers(Type *t);
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Type* hmap(Type *t);
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Type* hiter(Type* t);
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Type* mapbucket(Type *t);
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/*
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* select.c
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@ -117,16 +117,29 @@ enum {
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};
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static Type*
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makefield(char *name, Type *t)
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{
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Type *f;
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f = typ(TFIELD);
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f->type = t;
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f->sym = mal(sizeof(Sym));
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f->sym->name = name;
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return f;
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}
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Type*
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mapbucket(Type *t)
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{
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Type *keytype, *valtype;
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Type *bucket;
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Type *overflowfield, *keysfield, *valuesfield;
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int32 offset;
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Type *bucket, *arr;
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Type *field[4];
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int32 n;
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if(t->bucket != T)
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return t->bucket;
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bucket = typ(TSTRUCT);
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keytype = t->down;
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valtype = t->type;
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dowidth(keytype);
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@ -136,119 +149,69 @@ mapbucket(Type *t)
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if(valtype->width > MAXVALSIZE)
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valtype = ptrto(valtype);
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bucket = typ(TSTRUCT);
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bucket->noalg = 1;
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// The first field is: uint8 topbits[BUCKETSIZE].
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// We don't need to encode it as GC doesn't care about it.
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offset = BUCKETSIZE * 1;
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keysfield = typ(TFIELD);
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keysfield->type = typ(TARRAY);
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keysfield->type->type = keytype;
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keysfield->type->bound = BUCKETSIZE;
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keysfield->type->width = BUCKETSIZE * keytype->width;
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keysfield->width = offset;
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keysfield->sym = mal(sizeof(Sym));
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keysfield->sym->name = "keys";
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offset += BUCKETSIZE * keytype->width;
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valuesfield = typ(TFIELD);
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valuesfield->type = typ(TARRAY);
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valuesfield->type->type = valtype;
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valuesfield->type->bound = BUCKETSIZE;
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valuesfield->type->width = BUCKETSIZE * valtype->width;
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valuesfield->width = offset;
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valuesfield->sym = mal(sizeof(Sym));
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valuesfield->sym->name = "values";
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offset += BUCKETSIZE * valtype->width;
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overflowfield = typ(TFIELD);
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overflowfield->type = ptrto(bucket);
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overflowfield->width = offset; // "width" is offset in structure
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overflowfield->sym = mal(sizeof(Sym)); // not important but needs to be set to give this type a name
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overflowfield->sym->name = "overflow";
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offset += widthptr;
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// Pad to the native integer alignment.
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// This is usually the same as widthptr; the exception (as usual) is nacl/amd64.
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if(widthreg > widthptr)
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offset += widthreg - widthptr;
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arr = typ(TARRAY);
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arr->type = types[TUINT8];
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arr->bound = BUCKETSIZE;
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field[0] = makefield("topbits", arr);
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arr = typ(TARRAY);
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arr->type = keytype;
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arr->bound = BUCKETSIZE;
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field[1] = makefield("keys", arr);
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arr = typ(TARRAY);
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arr->type = valtype;
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arr->bound = BUCKETSIZE;
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field[2] = makefield("values", arr);
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field[3] = makefield("overflow", ptrto(bucket));
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// link up fields
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bucket->type = keysfield;
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keysfield->down = valuesfield;
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valuesfield->down = overflowfield;
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overflowfield->down = T;
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bucket->noalg = 1;
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bucket->local = t->local;
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bucket->type = field[0];
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for(n = 0; n < nelem(field)-1; n++)
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field[n]->down = field[n+1];
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field[nelem(field)-1]->down = T;
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dowidth(bucket);
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// See comment on hmap.overflow in ../../runtime/hashmap.go.
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if(!haspointers(t->type) && !haspointers(t->down))
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bucket->haspointers = 1; // no pointers
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bucket->width = offset;
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bucket->local = t->local;
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t->bucket = bucket;
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bucket->map = t;
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return bucket;
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}
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// Builds a type respresenting a Hmap structure for
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// the given map type. This type is not visible to users -
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// we include only enough information to generate a correct GC
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// program for it.
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// Builds a type representing a Hmap structure for the given map type.
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// Make sure this stays in sync with ../../runtime/hashmap.go!
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static Type*
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Type*
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hmap(Type *t)
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{
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Type *h, *bucket;
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Type *bucketsfield, *oldbucketsfield, *overflowfield;
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int32 offset;
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Type *field[8];
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int32 n;
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if(t->hmap != T)
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return t->hmap;
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bucket = mapbucket(t);
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field[0] = makefield("count", types[TINT]);
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field[1] = makefield("flags", types[TUINT8]);
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field[2] = makefield("B", types[TUINT8]);
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field[3] = makefield("hash0", types[TUINT32]);
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field[4] = makefield("buckets", ptrto(bucket));
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field[5] = makefield("oldbuckets", ptrto(bucket));
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field[6] = makefield("nevacuate", types[TUINTPTR]);
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field[7] = makefield("overflow", types[TUNSAFEPTR]);
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h = typ(TSTRUCT);
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h->noalg = 1;
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offset = widthint; // count
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offset += 1; // flags
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offset += 1; // B
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offset += 2; // padding
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offset += 4; // hash0
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offset = (offset + widthptr - 1) / widthptr * widthptr;
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bucketsfield = typ(TFIELD);
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bucketsfield->type = ptrto(bucket);
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bucketsfield->width = offset;
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bucketsfield->sym = mal(sizeof(Sym));
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bucketsfield->sym->name = "buckets";
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offset += widthptr;
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oldbucketsfield = typ(TFIELD);
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oldbucketsfield->type = ptrto(bucket);
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oldbucketsfield->width = offset;
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oldbucketsfield->sym = mal(sizeof(Sym));
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oldbucketsfield->sym->name = "oldbuckets";
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offset += widthptr;
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offset += widthptr; // nevacuate
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overflowfield = typ(TFIELD);
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overflowfield->type = types[TUNSAFEPTR];
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overflowfield->width = offset;
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overflowfield->sym = mal(sizeof(Sym));
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overflowfield->sym->name = "overflow";
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offset += widthptr;
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// link up fields
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h->type = bucketsfield;
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bucketsfield->down = oldbucketsfield;
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oldbucketsfield->down = overflowfield;
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overflowfield->down = T;
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h->width = offset;
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h->local = t->local;
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h->type = field[0];
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for(n = 0; n < nelem(field)-1; n++)
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field[n]->down = field[n+1];
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field[nelem(field)-1]->down = T;
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dowidth(h);
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t->hmap = h;
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h->map = t;
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return h;
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@ -257,8 +220,8 @@ hmap(Type *t)
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Type*
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hiter(Type *t)
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{
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int32 n, off;
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Type *field[9];
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int32 n;
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Type *field[12];
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Type *i;
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if(t->hiter != T)
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@ -272,73 +235,37 @@ hiter(Type *t)
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// h *Hmap
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// buckets *Bucket
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// bptr *Bucket
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// overflow unsafe.Pointer
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// other [4]uintptr
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// overflow0 unsafe.Pointer
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// overflow1 unsafe.Pointer
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// startBucket uintptr
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// stuff uintptr
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// bucket uintptr
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// checkBucket uintptr
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// }
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// must match ../../runtime/hashmap.c:hash_iter.
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field[0] = typ(TFIELD);
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field[0]->type = ptrto(t->down);
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field[0]->sym = mal(sizeof(Sym));
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field[0]->sym->name = "key";
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field[1] = typ(TFIELD);
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field[1]->type = ptrto(t->type);
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field[1]->sym = mal(sizeof(Sym));
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field[1]->sym->name = "val";
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field[2] = typ(TFIELD);
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field[2]->type = ptrto(types[TUINT8]); // TODO: is there a Type type?
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field[2]->sym = mal(sizeof(Sym));
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field[2]->sym->name = "t";
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field[3] = typ(TFIELD);
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field[3]->type = ptrto(hmap(t));
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field[3]->sym = mal(sizeof(Sym));
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field[3]->sym->name = "h";
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field[4] = typ(TFIELD);
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field[4]->type = ptrto(mapbucket(t));
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field[4]->sym = mal(sizeof(Sym));
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field[4]->sym->name = "buckets";
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field[5] = typ(TFIELD);
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field[5]->type = ptrto(mapbucket(t));
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field[5]->sym = mal(sizeof(Sym));
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field[5]->sym->name = "bptr";
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field[6] = typ(TFIELD);
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field[6]->type = types[TUNSAFEPTR];
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field[6]->sym = mal(sizeof(Sym));
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field[6]->sym->name = "overflow0";
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field[7] = typ(TFIELD);
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field[7]->type = types[TUNSAFEPTR];
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field[7]->sym = mal(sizeof(Sym));
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field[7]->sym->name = "overflow1";
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// all other non-pointer fields
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field[8] = typ(TFIELD);
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field[8]->type = typ(TARRAY);
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field[8]->type->type = types[TUINTPTR];
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field[8]->type->bound = 4;
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field[8]->type->width = 4 * widthptr;
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field[8]->sym = mal(sizeof(Sym));
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field[8]->sym->name = "other";
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field[0] = makefield("key", ptrto(t->down));
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field[1] = makefield("val", ptrto(t->type));
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field[2] = makefield("t", ptrto(types[TUINT8]));
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field[3] = makefield("h", ptrto(hmap(t)));
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field[4] = makefield("buckets", ptrto(mapbucket(t)));
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field[5] = makefield("bptr", ptrto(mapbucket(t)));
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field[6] = makefield("overflow0", types[TUNSAFEPTR]);
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field[7] = makefield("overflow1", types[TUNSAFEPTR]);
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field[8] = makefield("startBucket", types[TUINTPTR]);
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field[9] = makefield("stuff", types[TUINTPTR]); // offset+wrapped+B+I
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field[10] = makefield("bucket", types[TUINTPTR]);
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field[11] = makefield("checkBucket", types[TUINTPTR]);
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// build iterator struct holding the above fields
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i = typ(TSTRUCT);
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i->noalg = 1;
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i->type = field[0];
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off = 0;
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for(n = 0; n < nelem(field)-1; n++) {
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for(n = 0; n < nelem(field)-1; n++)
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field[n]->down = field[n+1];
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field[n]->width = off;
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off += field[n]->type->width;
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}
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field[nelem(field)-1]->down = T;
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off += field[nelem(field)-1]->type->width;
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if(off != 12 * widthptr)
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yyerror("hash_iter size not correct %d %d", off, 11 * widthptr);
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dowidth(i);
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if(i->width != 12 * widthptr)
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yyerror("hash_iter size not correct %d %d", i->width, 12 * widthptr);
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t->hiter = i;
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i->map = t;
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return i;
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@ -86,7 +86,7 @@ func ifacethash(i1 any) (ret uint32)
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func efacethash(i1 any) (ret uint32)
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// *byte is really *runtime.Type
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func makemap(mapType *byte, hint int64) (hmap map[any]any)
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func makemap(mapType *byte, hint int64, mapbuf *any, bucketbuf *any) (hmap map[any]any)
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func mapaccess1(mapType *byte, hmap map[any]any, key *any) (val *any)
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func mapaccess1_fast32(mapType *byte, hmap map[any]any, key any) (val *any)
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func mapaccess1_fast64(mapType *byte, hmap map[any]any, key any) (val *any)
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@ -1330,12 +1330,32 @@ walkexpr(Node **np, NodeList **init)
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t = n->type;
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fn = syslook("makemap", 1);
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argtype(fn, t->down); // any-1
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argtype(fn, t->type); // any-2
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n = mkcall1(fn, n->type, init,
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typename(n->type),
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conv(n->left, types[TINT64]));
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a = nodnil(); // hmap buffer
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r = nodnil(); // bucket buffer
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if(n->esc == EscNone) {
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// Allocate hmap buffer on stack.
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var = temp(hmap(t));
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a = nod(OAS, var, N); // zero temp
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typecheck(&a, Etop);
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*init = list(*init, a);
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a = nod(OADDR, var, N);
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// Allocate one bucket on stack.
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// Maximum key/value size is 128 bytes, larger objects
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// are stored with an indirection. So max bucket size is 2048+eps.
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var = temp(mapbucket(t));
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r = nod(OAS, var, N); // zero temp
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typecheck(&r, Etop);
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*init = list(*init, r);
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r = nod(OADDR, var, N);
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}
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argtype(fn, hmap(t)); // hmap buffer
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argtype(fn, mapbucket(t)); // bucket buffer
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argtype(fn, t->down); // key type
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argtype(fn, t->type); // value type
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n = mkcall1(fn, n->type, init, typename(n->type), conv(n->left, types[TINT64]), a, r);
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goto ret;
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case OMAKESLICE:
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@ -182,8 +182,14 @@ func (h *hmap) createOverflow() {
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}
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}
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func makemap(t *maptype, hint int64) *hmap {
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// makemap implements a Go map creation make(map[k]v, hint)
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// If the compiler has determined that the map or the first bucket
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// can be created on the stack, h and/or bucket may be non-nil.
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// If h != nil, the map can be created directly in h.
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// If bucket != nil, bucket can be used as the first bucket.
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func makemap(t *maptype, hint int64, h *hmap, bucket unsafe.Pointer) *hmap {
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if sz := unsafe.Sizeof(hmap{}); sz > 48 || sz != uintptr(t.hmap.size) {
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println("runtime: sizeof(hmap) =", sz, ", t.hmap.size =", t.hmap.size)
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throw("bad hmap size")
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}
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@ -238,7 +244,7 @@ func makemap(t *maptype, hint int64) *hmap {
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// allocate initial hash table
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// if B == 0, the buckets field is allocated lazily later (in mapassign)
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// If hint is large zeroing this memory could take a while.
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var buckets unsafe.Pointer
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buckets := bucket
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if B != 0 {
|
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if checkgc {
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memstats.next_gc = memstats.heap_alloc
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@ -250,7 +256,9 @@ func makemap(t *maptype, hint int64) *hmap {
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if checkgc {
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memstats.next_gc = memstats.heap_alloc
|
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}
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h := (*hmap)(newobject(t.hmap))
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if h == nil {
|
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h = (*hmap)(newobject(t.hmap))
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}
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h.count = 0
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h.B = B
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h.flags = 0
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@ -956,7 +964,7 @@ func ismapkey(t *_type) bool {
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//go:linkname reflect_makemap reflect.makemap
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func reflect_makemap(t *maptype) *hmap {
|
||||
return makemap(t, 0)
|
||||
return makemap(t, 0, nil, nil)
|
||||
}
|
||||
|
||||
//go:linkname reflect_mapaccess reflect.mapaccess
|
||||
|
||||
@ -535,3 +535,13 @@ func benchmarkMapPop(b *testing.B, n int) {
|
||||
func BenchmarkMapPop100(b *testing.B) { benchmarkMapPop(b, 100) }
|
||||
func BenchmarkMapPop1000(b *testing.B) { benchmarkMapPop(b, 1000) }
|
||||
func BenchmarkMapPop10000(b *testing.B) { benchmarkMapPop(b, 10000) }
|
||||
|
||||
func TestNonEscapingMap(t *testing.T) {
|
||||
n := testing.AllocsPerRun(1000, func() {
|
||||
m := make(map[int]int)
|
||||
m[0] = 0
|
||||
})
|
||||
if n != 0 {
|
||||
t.Fatalf("want 0 allocs, got %v", n)
|
||||
}
|
||||
}
|
||||
|
||||
@ -234,6 +234,15 @@ func BenchmarkNewEmptyMap(b *testing.B) {
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkNewSmallMap(b *testing.B) {
|
||||
b.ReportAllocs()
|
||||
for i := 0; i < b.N; i++ {
|
||||
m := make(map[int]int)
|
||||
m[0] = 0
|
||||
m[1] = 1
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkMapIter(b *testing.B) {
|
||||
m := make(map[int]bool)
|
||||
for i := 0; i < 8; i++ {
|
||||
|
||||
@ -1751,3 +1751,20 @@ func slicerunetostring2() {
|
||||
r := []rune{1, 2, 3} // ERROR "\[\]rune literal does not escape"
|
||||
sink = string(r) // ERROR "string\(r\) escapes to heap"
|
||||
}
|
||||
|
||||
func makemap0() {
|
||||
m := make(map[int]int) // ERROR "make\(map\[int\]int\, 0\) does not escape"
|
||||
m[0] = 0
|
||||
m[1]++
|
||||
delete(m, 1)
|
||||
sink = m[0]
|
||||
}
|
||||
|
||||
func makemap1() map[int]int {
|
||||
return make(map[int]int) // ERROR "make\(map\[int\]int\, 0\) escapes to heap"
|
||||
}
|
||||
|
||||
func makemap2() {
|
||||
m := make(map[int]int) // ERROR "make\(map\[int\]int\, 0\) escapes to heap"
|
||||
sink = m
|
||||
}
|
||||
|
||||
@ -1751,3 +1751,20 @@ func slicerunetostring2() {
|
||||
r := []rune{1, 2, 3} // ERROR "\[\]rune literal does not escape"
|
||||
sink = string(r) // ERROR "string\(r\) escapes to heap"
|
||||
}
|
||||
|
||||
func makemap0() {
|
||||
m := make(map[int]int) // ERROR "make\(map\[int\]int\, 0\) does not escape"
|
||||
m[0] = 0
|
||||
m[1]++
|
||||
delete(m, 1)
|
||||
sink = m[0]
|
||||
}
|
||||
|
||||
func makemap1() map[int]int {
|
||||
return make(map[int]int) // ERROR "make\(map\[int\]int\, 0\) escapes to heap"
|
||||
}
|
||||
|
||||
func makemap2() {
|
||||
m := make(map[int]int) // ERROR "make\(map\[int\]int\, 0\) escapes to heap"
|
||||
sink = m
|
||||
}
|
||||
|
||||
@ -640,8 +640,8 @@ func bad40() {
|
||||
|
||||
func good40() {
|
||||
ret := T40{}
|
||||
ret.m = make(map[int]int) // ERROR "live at call to makemap: ret"
|
||||
ret.m = make(map[int]int) // ERROR "live at call to makemap: autotmp_.* ret"
|
||||
t := &ret
|
||||
printnl() // ERROR "live at call to printnl: ret"
|
||||
printnl() // ERROR "live at call to printnl: autotmp_.* ret"
|
||||
_ = t
|
||||
}
|
||||
|
||||
@ -25,15 +25,15 @@ func newT40() *T40 {
|
||||
}
|
||||
|
||||
func bad40() {
|
||||
t := newT40() // ERROR "live at call to makemap: ret"
|
||||
printnl() // ERROR "live at call to printnl: ret"
|
||||
t := newT40() // ERROR "live at call to makemap: autotmp_.* ret"
|
||||
printnl() // ERROR "live at call to printnl: autotmp_.* ret"
|
||||
_ = t
|
||||
}
|
||||
|
||||
func good40() {
|
||||
ret := T40{}
|
||||
ret.m = make(map[int]int) // ERROR "live at call to makemap: ret"
|
||||
ret.m = make(map[int]int) // ERROR "live at call to makemap: autotmp_.* ret"
|
||||
t := &ret
|
||||
printnl() // ERROR "live at call to printnl: ret"
|
||||
printnl() // ERROR "live at call to printnl: autotmp_.* ret"
|
||||
_ = t
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user