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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.
41 lines
1.6 KiB
D
41 lines
1.6 KiB
D
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* SPDX-License-Identifier: MPL-2.0
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, you can obtain one at https://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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provider libdns {
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probe delegdb_cleanup_done(void *, int);
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probe delegdb_cleanup_start(void *, int);
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probe delegdb_create(void *);
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probe delegdb_delete(void *, char *, int, int);
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probe delegdb_evict(void *, void *, char *);
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probe delegdb_insert_done(void *, char *, int);
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probe delegdb_insert_start(void *, char *);
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probe delegdb_lookup_done(void *, char *, int);
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probe delegdb_lookup_start(void *, char *);
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probe delegdb_reuse(void *);
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probe delegdb_shutdown(void *);
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probe xfrin_axfr_finalize_begin(void *, char *);
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probe xfrin_axfr_finalize_end(void *, char *, int);
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probe xfrin_connected(void *, char *, int);
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probe xfrin_done_callback_begin(void *, char *, int);
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probe xfrin_done_callback_end(void *, char *, int);
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probe xfrin_read(void *, char *, int);
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probe xfrin_recv_answer(void *, char *, void *);
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probe xfrin_recv_done(void *, char *, int);
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probe xfrin_recv_parsed(void *, char *, int);
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probe xfrin_recv_question(void *, char *, void *);
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probe xfrin_recv_send_request(void *, char *);
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probe xfrin_recv_start(void *, char *, int);
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probe xfrin_recv_try_axfr(void *, char *, int);
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probe xfrin_sent(void *, char *, int);
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probe xfrin_start(void *, char *);
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};
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