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Create the spillattimer when needed and destroy it early

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Instead of creating dns_resolver .spillattimer when the dns_resolver_t
object is created, create it on the current loop as needed and destroy
it as soon as the timer has finished its job.  This avoids the need to
manipulate the timer from a different thread.
This commit is contained in:
Ondřej Surý 2022-09-12 14:51:33 +02:00 committed by Evan Hunt
parent f16c46173c
commit a56f9d5061
1 changed files with 34 additions and 19 deletions
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47
lib/dns/resolver.c
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@ -17,6 +17,7 @@
#include <inttypes.h>
#include <stdbool.h>
#include <isc/async.h>
#include <isc/atomic.h>
#include <isc/counter.h>
#include <isc/hash.h>
@ -1738,12 +1739,14 @@ fcount_decr(fetchctx_t *fctx) {
UNLOCK(&zbucket->lock);
}
static void
spillattimer_countdown(void *arg);
static void
fctx_sendevents(fetchctx_t *fctx, isc_result_t result, int line) {
dns_fetchevent_t *event, *next_event;
isc_task_t *task;
unsigned int count = 0;
isc_interval_t i;
bool logit = false;
isc_time_t now;
unsigned int old_spillat;
@ -1822,10 +1825,21 @@ fctx_sendevents(fetchctx_t *fctx, isc_result_t result, int line) {
if (new_spillat != old_spillat) {
logit = true;
}
/* Timer not running */
if (fctx->res->spillattimer == NULL) {
isc_interval_t i;
isc_timer_create(
isc_loop_current(fctx->res->loopmgr),
spillattimer_countdown, fctx->res,
&fctx->res->spillattimer);
isc_interval_set(&i, 20 * 60, 0);
isc_timer_start(fctx->res->spillattimer,
isc_timertype_ticker, &i);
}
}
UNLOCK(&fctx->res->lock);
if (logit) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_RESOLVER,
@ -10196,7 +10210,7 @@ destroy(dns_resolver_t *res) {
isc_mem_put(res->mctx, a, sizeof(*a));
}
dns_badcache_destroy(&res->badcache);
isc_timer_destroy(&res->spillattimer);
dns_view_weakdetach(&res->view);
isc_mem_putanddetach(&res->mctx, res, sizeof(*res));
}
@ -10204,26 +10218,28 @@ destroy(dns_resolver_t *res) {
static void
spillattimer_countdown(void *arg) {
dns_resolver_t *res = (dns_resolver_t *)arg;
unsigned int count;
bool logit = false;
unsigned int spillat = 0;
REQUIRE(VALID_RESOLVER(res));
if (atomic_load(&res->exiting)) {
isc_timer_destroy(&res->spillattimer);
return;
}
LOCK(&res->lock);
INSIST(!atomic_load_acquire(&res->exiting));
if (res->spillat > res->spillatmin) {
res->spillat--;
logit = true;
spillat = --res->spillat;
}
if (res->spillat <= res->spillatmin) {
isc_timer_stop(res->spillattimer);
isc_timer_destroy(&res->spillattimer);
}
count = res->spillat;
UNLOCK(&res->lock);
if (logit) {
if (spillat > 0) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_RESOLVER,
DNS_LOGMODULE_RESOLVER, ISC_LOG_NOTICE,
"clients-per-query decreased to %u", count);
"clients-per-query decreased to %u", spillat);
}
}
@ -10236,7 +10252,6 @@ dns_resolver_create(dns_view_t *view, isc_loopmgr_t *loopmgr,
isc_result_t result = ISC_R_SUCCESS;
char name[sizeof("res4294967295")];
dns_resolver_t *res = NULL;
isc_loop_t *loop = NULL;
/*
* Create a resolver.
@ -10324,10 +10339,6 @@ dns_resolver_create(dns_view_t *view, isc_loopmgr_t *loopmgr,
isc_mutex_init(&res->lock);
isc_mutex_init(&res->primelock);
loop = isc_loop_main(res->loopmgr);
isc_timer_create(loop, spillattimer_countdown, res, &res->spillattimer);
res->magic = RES_MAGIC;
*resp = res;
@ -10507,7 +10518,11 @@ dns_resolver_shutdown(dns_resolver_t *res) {
isc_ht_iter_destroy(&it);
RWUNLOCK(&res->hash_lock, isc_rwlocktype_read);
isc_timer_stop(res->spillattimer);
LOCK(&res->lock);
if (res->spillattimer != NULL) {
isc_timer_async_destroy(&res->spillattimer);
}
UNLOCK(&res->lock);
}
}