From: Ondřej Surý <ondrej@sury.org>
Date: Wed, 24 Jun 2026 05:13:16 +0000 (+0200)
Subject: Mark the related slabheader as visited on cache hit
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=6e646e664a86e41165de428afd50575f7a166dfa;p=thirdparty%2Fbind9.git

Mark the related slabheader as visited on cache hit

A cache hit only marked the looked-up header as SIEVE-visited, leaving
its related header (the flattened counterpart) a candidate for eviction.
Mark both so related slabheaders age together.
---

diff --git a/lib/dns/qpcache.c b/lib/dns/qpcache.c
index 1a0d0f129d1..818b5632b4b 100644
--- a/lib/dns/qpcache.c
+++ b/lib/dns/qpcache.c
@@ -499,10 +499,10 @@ qpcache_miss(qpcache_t *qpdb, dns_slabheader_t *newheader,
 
 static void
 qpcache_hit(qpcache_t *qpdb ISC_ATTR_UNUSED, dns_slabheader_t *header) {
-	/*
-	 * On cache hit, we only mark the header as seen.
-	 */
 	ISC_SIEVE_MARK(header, visited);
+	if (header->related) {
+		ISC_SIEVE_MARK(header->related, visited);
+	}
 }
 
 /*