exempt hot path from iterator tracking

Author: RaduBerinde

pkg/storage/pebble_iterator.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/cockroachdb/cockroach/pkg/keys"
 	"github.com/cockroachdb/cockroach/pkg/roachpb"
+	"github.com/cockroachdb/cockroach/pkg/storage/fs"
 	"github.com/cockroachdb/cockroach/pkg/storage/mvccencoding"
 	"github.com/cockroachdb/cockroach/pkg/storage/pebbleiter"
 	"github.com/cockroachdb/cockroach/pkg/util"
@@ -228,6 +229,11 @@ func (p *pebbleIterator) setOptions(
 		UseL6Filters:              opts.useL6Filters,
 		Category:                  opts.ReadCategory.PebbleCategory(),
 	}
+	switch opts.ReadCategory {
+	case fs.BatchEvalReadCategory, fs.ScanRegularBatchEvalReadCategory, fs.ScanBackgroundBatchEvalReadCategory:
+		// Exempt hot paths from iterator tracking.
+		p.options.ExemptFromTracking = true
+	}
 	p.prefix = opts.Prefix
 
 	if opts.LowerBound != nil {