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Added TCP high-water statistics variable

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This variable will report the maximum number of simultaneous tcp clients
that BIND has served while running.

It can be verified by running rndc status, then inspect "tcp high-water:
count", or by generating statistics file, rndc stats, then inspect the
line with "TCP connection high-water" text.

The tcp-highwater variable is atomically updated based on an existing
tcp-quota system handled in ns/client.c.
This commit is contained in:
Diego Fronza 2019-11-05 17:48:47 -03:00 committed by Ondřej Surý
parent a544e2e300
commit 66fe8627de
5 changed files with 24 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
bin/named/server.c
View File

@ -11447,6 +11447,11 @@ named_server_status(named_server_t *server, isc_buffer_t **text) {
isc_quota_getmax(&server->sctx->tcpquota));
CHECK(putstr(text, line));
snprintf(line, sizeof(line), "TCP high-water: %u\n",
(unsigned)ns_stats_get_counter(server->sctx->nsstats,
ns_statscounter_tcphighwater));
CHECK(putstr(text, line));
if (server->reload_status != NAMED_RELOAD_DONE) {
snprintf(line, sizeof(line), "reload/reconfig %s\n",
server->reload_status == NAMED_RELOAD_FAILED

3
bin/named/statschannel.c
View File

@ -241,6 +241,8 @@ init_desc(void) {
SET_NSSTATDESC(invalidsig, "requests with invalid signature",
"ReqBadSIG");
SET_NSSTATDESC(requesttcp, "TCP requests received", "ReqTCP");
SET_NSSTATDESC(tcphighwater, "TCP connection high-water",
"TCPConnHighWater");
SET_NSSTATDESC(authrej, "auth queries rejected", "AuthQryRej");
SET_NSSTATDESC(recurserej, "recursive queries rejected", "RecQryRej");
SET_NSSTATDESC(xfrrej, "transfer requests rejected", "XfrRej");
@ -322,6 +324,7 @@ init_desc(void) {
"QryUsedStale");
SET_NSSTATDESC(prefetch, "queries triggered prefetch", "Prefetch");
SET_NSSTATDESC(keytagopt, "Keytag option received", "KeyTagOpt");
INSIST(i == ns_statscounter_max);
/* Initialize resolver statistics */

14
lib/isc/stats.c
View File

@ -29,17 +29,17 @@
#define ISC_STATS_VALID(x) ISC_MAGIC_VALID(x, ISC_STATS_MAGIC)
#if defined(_WIN32) && !defined(_WIN64)
typedef atomic_int_fast32_t isc_stat_t;
typedef atomic_int_fast32_t isc__atomic_statcounter_t;
#else
typedef atomic_int_fast64_t isc_stat_t;
typedef atomic_int_fast64_t isc__atomic_statcounter_t;
#endif
struct isc_stats {
unsigned int magic;
isc_mem_t *mctx;
isc_refcount_t references;
int ncounters;
isc_stat_t *counters;
unsigned int magic;
isc_mem_t *mctx;
isc_refcount_t references;
int ncounters;
isc__atomic_statcounter_t *counters;
};
static isc_result_t

7
lib/ns/client.c
View File

@ -3400,7 +3400,6 @@ client_accept(ns_client_t *client) {
isc_result_t result;
CTRACE("accept");
/*
* Set up a new TCP connection. This means try to attach to the
* TCP client quota (tcp-clients), but fail if we're over quota.
@ -3451,6 +3450,12 @@ client_accept(ns_client_t *client) {
RUNTIME_CHECK(result == ISC_R_SUCCESS);
}
/* TCP high-water stats update. */
unsigned int curr_tcpquota = isc_quota_getused(&client->sctx->tcpquota);
ns_stats_update_if_greater(client->sctx->nsstats,
ns_statscounter_tcphighwater,
curr_tcpquota);
/*
* If this client was set up using get_client() or get_worker(),
* then TCP is already marked active. However, if it was restarted

4
lib/ns/include/ns/stats.h
View File

@ -102,7 +102,9 @@ enum {
ns_statscounter_prefetch = 63,
ns_statscounter_keytagopt = 64,
ns_statscounter_max = 65
ns_statscounter_tcphighwater = 65,
ns_statscounter_max = 66,
};
void