preallocated capacity for map's certain usege of memory

core/genesis.go

@@ -624,7 +624,7 @@ func decodePrealloc(data string) types.GenesisAlloc {
 			acc.Nonce = account.Misc.Nonce
 			acc.Code = account.Misc.Code
 
-			acc.Storage = make(map[common.Hash]common.Hash, len(account.Misc.Slots))
+			acc.Storage = make(map[common.Hash]common.Hash)
 			for _, slot := range account.Misc.Slots {
 				acc.Storage[slot.Key] = slot.Val
 			}

node/rpcstack.go

@@ -436,7 +436,7 @@ type virtualHostHandler struct {
 }
 
 func newVHostHandler(vhosts []string, next http.Handler) http.Handler {
-	vhostMap := make(map[string]struct{}, len(vhosts))
+	vhostMap := make(map[string]struct{})
 	for _, allowedHost := range vhosts {
 		vhostMap[strings.ToLower(allowedHost)] = struct{}{}
 	}
@@ -636,7 +636,7 @@ func RegisterApis(apis []rpc.API, modules []string, srv *rpc.Server) error {
 		log.Error("Unavailable modules in HTTP API list", "unavailable", bad, "available", available)
 	}
 	// Generate the allow list based on the allowed modules
-	allowList := make(map[string]bool, len(modules))
+	allowList := make(map[string]bool)
 	for _, module := range modules {
 		allowList[module] = true
 	}

rpc/server.go

@@ -190,7 +190,7 @@ func (s *RPCService) Modules() map[string]string {
 	s.server.services.mu.Lock()
 	defer s.server.services.mu.Unlock()
 
-	modules := make(map[string]string, len(s.server.services.services))
+	modules := make(map[string]string)
 	for name := range s.server.services.services {
 		modules[name] = "1.0"
 	}