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Date:      Tue, 19 Feb 2019 10:28:59 +0000 (UTC)
From:      Edward Tomasz Napierala <trasz@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org
Subject:   svn commit: r344274 - stable/12/sys/rpc/rpcsec_gss
Message-ID:  <201902191028.x1JASxof063141@repo.freebsd.org>
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Author: trasz
Date: Tue Feb 19 10:28:59 2019
New Revision: 344274
URL: https://svnweb.freebsd.org/changeset/base/344274

Log:
  MFC r342114:
  
  Add kern.rpc.gss.client_max, to make it possible to bump it easily.
  This can drastically lower the load on gssd(8) on large NFS servers.

Modified:
  stable/12/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c
Directory Properties:
  stable/12/   (props changed)

Modified: stable/12/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c
==============================================================================
--- stable/12/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c	Tue Feb 19 10:17:49 2019	(r344273)
+++ stable/12/sys/rpc/rpcsec_gss/svc_rpcsec_gss.c	Tue Feb 19 10:28:59 2019	(r344274)
@@ -171,9 +171,22 @@ struct svc_rpc_gss_cookedcred {
 
 #define CLIENT_HASH_SIZE	256
 #define CLIENT_MAX		128
+u_int svc_rpc_gss_client_max = CLIENT_MAX;
+
+SYSCTL_NODE(_kern, OID_AUTO, rpc, CTLFLAG_RW, 0, "RPC");
+SYSCTL_NODE(_kern_rpc, OID_AUTO, gss, CTLFLAG_RW, 0, "GSS");
+
+SYSCTL_UINT(_kern_rpc_gss, OID_AUTO, client_max, CTLFLAG_RW,
+    &svc_rpc_gss_client_max, 0,
+    "Max number of rpc-gss clients");
+
+static u_int svc_rpc_gss_client_count;
+SYSCTL_UINT(_kern_rpc_gss, OID_AUTO, client_count, CTLFLAG_RD,
+    &svc_rpc_gss_client_count, 0,
+    "Number of rpc-gss clients");
+
 struct svc_rpc_gss_client_list svc_rpc_gss_client_hash[CLIENT_HASH_SIZE];
 struct svc_rpc_gss_client_list svc_rpc_gss_clients;
-static size_t svc_rpc_gss_client_count;
 static uint32_t svc_rpc_gss_next_clientid = 1;
 
 static void
@@ -669,7 +682,7 @@ svc_rpc_gss_timeout_clients(void)
 	 */
 	sx_xlock(&svc_rpc_gss_lock);
 	client = TAILQ_LAST(&svc_rpc_gss_clients, svc_rpc_gss_client_list);
-	while (svc_rpc_gss_client_count > CLIENT_MAX && client != NULL) {
+	while (svc_rpc_gss_client_count > svc_rpc_gss_client_max && client != NULL) {
 		svc_rpc_gss_forget_client_locked(client);
 		sx_xunlock(&svc_rpc_gss_lock);
 		svc_rpc_gss_release_client(client);

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