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592f3cc671
Instrument the delegation cache (introduced to back both NS-based and DELEG-based delegations) with 11 USDT probes in the libdns provider so that hit rate, eviction pressure, and lookup latency can be measured without recompiling or enabling logging. The probes are: - delegdb_lookup_start / delegdb_lookup_done wrap dns_delegdb_lookup() and pass the query name plus the result code. - delegdb_insert_start / delegdb_insert_done wrap dns_delegset_insert(). The early SHUTTINGDOWN return is funneled through the cleanup label so the done probe fires on every path. - delegdb_cleanup_start / delegdb_cleanup_done bracket the SIEVE-based eviction triggered when the cache goes overmem, reporting the number of bytes requested and actually reclaimed. An additional per-node delegdb_evict probe (guarded by _ENABLED() because it fires inside the loop) exposes which zones are being evicted. - delegdb_create, delegdb_reuse, and delegdb_shutdown trace the per-view lifecycle across server reloads. - delegdb_delete traces rndc flush-delegation paths, reporting whether a subtree or single name was removed. Name arguments are stringified with dns_name_format() behind LIBDNS_*_ENABLED() guards so that the hot lookup and insert paths remain zero-cost when no consumer is attached. |
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| bench | ||
| dns | ||
| include/tests | ||
| isc | ||
| isccfg | ||
| libtest | ||
| ns | ||
| .gitignore | ||
| meson.build | ||