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chg: dev: Don't count failed additions into the cache

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Previously, when the new header was NOT added into the cache, we would
increment and then decrement stat counters immediately.  This has been fixed.

Merge branch 'ondrej/dont-stat-count-failed-adds' into 'main'

See merge request isc-projects/bind9!10859
This commit is contained in:
Ondřej Surý 2025-08-18 04:55:43 +02:00
commit 14d2bbbfdf
1 changed files with 23 additions and 29 deletions
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48
lib/dns/qpcache.c
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@ -55,6 +55,7 @@
#include <dns/rdatatype.h>
#include <dns/stats.h>
#include <dns/time.h>
#include <dns/types.h>
#include <dns/view.h>
#include "db_p.h"
@ -841,9 +842,8 @@ static void
mark(dns_slabheader_t *header, uint_least16_t flag) {
uint_least16_t attributes = atomic_load_acquire(&header->attributes);
uint_least16_t newattributes = 0;
dns_stats_t *stats = NULL;
qpcache_t *qpdb = HEADERNODE(header)->qpdb;
/*
* If we are already ancient there is nothing to do.
*/
@ -859,11 +859,10 @@ mark(dns_slabheader_t *header, uint_least16_t flag) {
* Decrement and increment the stats counter for the appropriate
* RRtype.
*/
stats = dns_db_getrrsetstats(&qpdb->common);
if (stats != NULL) {
update_rrsetstats(stats, header->typepair, attributes, false);
update_rrsetstats(stats, header->typepair, newattributes, true);
}
update_rrsetstats(qpdb->rrsetstats, header->typepair, attributes,
false);
update_rrsetstats(qpdb->rrsetstats, header->typepair, newattributes,
true);
}
static void
@ -2280,9 +2279,8 @@ qpcache__destroy(qpcache_t *qpdb) {
isc_heap_destroy(&qpdb->buckets[i].heap);
}
if (qpdb->rrsetstats != NULL) {
dns_stats_detach(&qpdb->rrsetstats);
}
if (qpdb->cachestats != NULL) {
isc_stats_detach(&qpdb->cachestats);
}
@ -2654,7 +2652,6 @@ add(qpcache_t *qpdb, qpcnode_t *qpnode,
* The NXDOMAIN/NODATA(QTYPE=ANY)
* is more trusted.
*/
dns_slabheader_destroy(&newheader);
if (addedrdataset != NULL) {
bindrdataset(
qpdb, qpnode, topheader,
@ -2703,7 +2700,6 @@ find_header:
* Deleting an already non-existent rdataset has no effect.
*/
if (!EXISTS(header) && !EXISTS(newheader)) {
dns_slabheader_destroy(&newheader);
return DNS_R_UNCHANGED;
}
@ -2717,7 +2713,6 @@ find_header:
if (trust < header->trust &&
(ACTIVE(header, now) || !EXISTS(header)))
{
dns_slabheader_destroy(&newheader);
if (addedrdataset != NULL) {
bindrdataset(qpdb, qpnode, header, now,
nlocktype, tlocktype,
@ -2764,13 +2759,12 @@ find_header:
header->closest = newheader->closest;
newheader->closest = NULL;
}
dns_slabheader_destroy(&newheader);
if (addedrdataset != NULL) {
bindrdataset(qpdb, qpnode, header, now,
nlocktype, tlocktype,
addedrdataset DNS__DB_FLARG_PASS);
}
return ISC_R_SUCCESS;
return DNS_R_UNCHANGED;
}
/*
@ -2819,13 +2813,12 @@ find_header:
header->closest = newheader->closest;
newheader->closest = NULL;
}
dns_slabheader_destroy(&newheader);
if (addedrdataset != NULL) {
bindrdataset(qpdb, qpnode, header, now,
nlocktype, tlocktype,
addedrdataset DNS__DB_FLARG_PASS);
}
return ISC_R_SUCCESS;
return DNS_R_UNCHANGED;
}
qpcache_miss(qpdb, newheader, &nlocktype,
@ -2848,7 +2841,6 @@ find_header:
* The type already doesn't exist; no point trying
* to delete it.
*/
dns_slabheader_destroy(&newheader);
return DNS_R_UNCHANGED;
} else {
/* No rdatasets of the given type exist at the node. */
@ -3051,7 +3043,6 @@ qpcache_addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
result = addnoqname(qpnode->mctx, newheader, qpdb->maxrrperset,
rdataset);
if (result != ISC_R_SUCCESS) {
dns_slabheader_destroy(&newheader);
return result;
}
}
@ -3059,7 +3050,6 @@ qpcache_addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
result = addclosest(qpnode->mctx, newheader, qpdb->maxrrperset,
rdataset);
if (result != ISC_R_SUCCESS) {
dns_slabheader_destroy(&newheader);
return result;
}
}
@ -3096,13 +3086,6 @@ qpcache_addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
NODE_WRLOCK(nlock, &nlocktype);
if (qpdb->rrsetstats != NULL) {
DNS_SLABHEADER_SETATTR(newheader, DNS_SLABHEADERATTR_STATCOUNT);
update_rrsetstats(qpdb->rrsetstats, newheader->typepair,
atomic_load_acquire(&newheader->attributes),
true);
}
expire_ttl_headers(qpdb, qpnode->locknum, &nlocktype, &tlocktype,
now DNS__DB_FLARG_PASS);
@ -3125,9 +3108,17 @@ qpcache_addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
result = add(qpdb, qpnode, name, newheader, options, addedrdataset, now,
nlocktype, tlocktype DNS__DB_FLARG_PASS);
if (result == ISC_R_SUCCESS && delegating) {
if (result == ISC_R_SUCCESS) {
DNS_SLABHEADER_SETATTR(newheader, DNS_SLABHEADERATTR_STATCOUNT);
update_rrsetstats(qpdb->rrsetstats, newheader->typepair,
newheader->attributes, true);
if (delegating) {
qpnode->delegating = 1;
}
} else {
dns_slabheader_destroy(&newheader);
}
NODE_UNLOCK(nlock, &nlocktype);
@ -3181,6 +3172,9 @@ qpcache_deleterdataset(dns_db_t *db, dns_dbnode_t *node,
NODE_WRLOCK(nlock, &nlocktype);
result = add(qpdb, qpnode, NULL, newheader, DNS_DBADD_FORCE, NULL, 0,
nlocktype, isc_rwlocktype_none DNS__DB_FLARG_PASS);
if (result != ISC_R_SUCCESS) {
dns_slabheader_destroy(&newheader);
}
NODE_UNLOCK(nlock, &nlocktype);
return result;