the start of some changes I was experimenting with. broken

core/blockchain.go

@@ -681,6 +681,8 @@ func (bc *BlockChain) processBlockWithAccessList(parentRoot common.Hash, block *
 	}); ok {
 		prefetchAccountReads, prefetchStorageReads = pr.PrefetchReadTimes()
 	}
+	prefetchAccountReads, prefetchStorageReads = prefetchReader.(*.PrefetchReadTimes()
+
 	balAccountReads, balStorageReads := stateTransition.ReadTimes()
 	stats.AccountReads = res.Reads.Account + prefetchAccountReads + balAccountReads
 	stats.StorageReads = res.Reads.Storage + prefetchStorageReads + balStorageReads

core/state/database.go

@@ -18,6 +18,7 @@ package state
 
 import (
 	"fmt"
+	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/overlay"
@@ -240,6 +241,26 @@ func (db *CachingDB) ReadersWithCacheStats(stateRoot common.Hash) (Reader, Reade
 	return ra, rb, nil
 }
 
+type ReaderEIP7928Metrics struct {
+	// the total amount of time it took to complete the scheduled workload
+	WallElapsed time.Duration
+	// the aggregated total time spent on state loading by all workers
+	TotalElapsed time.Duration
+	// the amount of accounts loaded
+	Accounts int
+	// the amount of storage slots loaded
+	Storages int
+	// number of accounts with code loaded
+	Codes int
+	// total amount of code bytes loaded
+	CodeBytes int
+}
+
+type ReaderEIP7928 interface {
+	Reader
+	Metrics() *ReaderEIP7928Metrics
+}
+
 // ReaderEIP7928 creates a state reader with the manner of Block-level accessList.
 func (db *CachingDB) ReaderEIP7928(stateRoot common.Hash, accessList map[common.Address][]common.Hash, threads int) (Reader, error) {
 	base, err := db.StateReader(stateRoot)

core/state/reader.go

@@ -574,10 +574,3 @@ func (r *reader) PrefetchReadTimes() (account, storage time.Duration) {
 	}
 	return 0, 0
 }
-
-// WaitPrefetch blocks until the wrapped prefetcher drains; no-op otherwise.
-func (r *reader) WaitPrefetch() {
-	if pr, ok := r.StateReader.(interface{ Wait() error }); ok {
-		_ = pr.Wait()
-	}
-}