From: Alessio Podda <alessio@isc.org>
Date: Wed, 25 Jun 2025 08:30:28 +0000 (+0000)
Subject: chg: dev: Use RCU for rad name
X-Git-Tag: v9.21.10~27
X-Git-Url: http://git.ipfire.org/index.cgi?a=commitdiff_plain;h=32e86ed6434491dbb71be98d3f8a6e2fffaa4b83;p=thirdparty%2Fbind9.git

chg: dev: Use RCU for rad name

The RAD/agent domain is a functionality from RFC 9567 that provides
a suffix for reporting error messages. On every query context reset,
we need to check if a RAD is configured and, if so, copy it.

Since we allow the RAD to be changed by reconfiguring the zone,
this access is currently protected by a mutex, which causes contention.

This commit replaces the mutex with RCU to reduce contention. The
change results in a 3% performance improvement in the 1M delegation
test.

Merge branch 'alessio/rcu-rad' into 'main'

See merge request isc-projects/bind9!10616
---

32e86ed6434491dbb71be98d3f8a6e2fffaa4b83