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[9.20] fix: usr: Apply the memory limit only to ADB database items

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Resolver under heavy-load could exhaust the memory available for storing
the information in the Address Database (ADB) effectively evicting already
stored information in the ADB.  The memory used to retrieve and provide
information from the ADB is now not a subject of the same memory limits
that are applied for storing the information in the Address Database.

Closes #5127

Backport of MR !9954

Merge branch 'backport-5127-change-ADB-memory-split-9.20' into 'bind-9.20'

See merge request isc-projects/bind9!9975
This commit is contained in:
Ondřej Surý 2025-01-22 14:01:52 +00:00
commit 0ab22458f5
1 changed files with 7 additions and 7 deletions
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14
lib/dns/adb.c
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@ -1114,7 +1114,7 @@ static dns_adbfind_t *
new_adbfind(dns_adb_t *adb, in_port_t port) {
dns_adbfind_t *find = NULL;
find = isc_mem_get(adb->mctx, sizeof(*find));
find = isc_mem_get(adb->hmctx, sizeof(*find));
*find = (dns_adbfind_t){
.port = port,
.result_v4 = ISC_R_UNEXPECTED,
@ -1153,7 +1153,7 @@ free_adbfind(dns_adbfind_t **findp) {
isc_mutex_destroy(&find->lock);
isc_mem_put(adb->mctx, find, sizeof(*find));
isc_mem_put(adb->hmctx, find, sizeof(*find));
dns_adb_detach(&adb);
}
@ -1161,7 +1161,7 @@ static dns_adbfetch_t *
new_adbfetch(dns_adb_t *adb) {
dns_adbfetch_t *fetch = NULL;
fetch = isc_mem_get(adb->mctx, sizeof(*fetch));
fetch = isc_mem_get(adb->hmctx, sizeof(*fetch));
*fetch = (dns_adbfetch_t){ 0 };
dns_rdataset_init(&fetch->rdataset);
@ -1185,7 +1185,7 @@ free_adbfetch(dns_adb_t *adb, dns_adbfetch_t **fetchp) {
dns_rdataset_disassociate(&fetch->rdataset);
}
isc_mem_put(adb->mctx, fetch, sizeof(*fetch));
isc_mem_put(adb->hmctx, fetch, sizeof(*fetch));
}
/*
@ -1196,7 +1196,7 @@ static dns_adbaddrinfo_t *
new_adbaddrinfo(dns_adb_t *adb, dns_adbentry_t *entry, in_port_t port) {
dns_adbaddrinfo_t *ai = NULL;
ai = isc_mem_get(adb->mctx, sizeof(*ai));
ai = isc_mem_get(adb->hmctx, sizeof(*ai));
*ai = (dns_adbaddrinfo_t){
.srtt = atomic_load(&entry->srtt),
.flags = atomic_load(&entry->flags),
@ -1229,7 +1229,7 @@ free_adbaddrinfo(dns_adb_t *adb, dns_adbaddrinfo_t **ainfo) {
}
dns_adbentry_detach(&ai->entry);
isc_mem_put(adb->mctx, ai, sizeof(*ai));
isc_mem_put(adb->hmctx, ai, sizeof(*ai));
}
static bool
@ -1866,7 +1866,7 @@ dns_adb_create(isc_mem_t *mem, dns_view_t *view, dns_adb_t **newadb) {
isc_mem_attach(mem, &adb->mctx);
isc_mem_create(&adb->hmctx);
isc_mem_setname(adb->hmctx, "ADB_hashmaps");
isc_mem_setname(adb->hmctx, "ADB_dynamic");
isc_hashmap_create(adb->hmctx, ADB_HASH_BITS, &adb->names);
isc_rwlock_init(&adb->names_lock);