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Index: sys/netinet/tcp_hostcache.c
===================================================================
--- sys/netinet/tcp_hostcache.c
+++ sys/netinet/tcp_hostcache.c
@@ -121,6 +121,7 @@
static struct hc_metrics *tcp_hc_lookup(struct in_conninfo *);
static struct hc_metrics *tcp_hc_insert(struct in_conninfo *);
static int sysctl_tcp_hc_list(SYSCTL_HANDLER_ARGS);
+static int sysctl_tcp_hc_histo(SYSCTL_HANDLER_ARGS);
static int sysctl_tcp_hc_purgenow(SYSCTL_HANDLER_ARGS);
static void tcp_hc_purge_internal(int);
static void tcp_hc_purge(void *);
@@ -168,6 +169,11 @@
0, 0, sysctl_tcp_hc_list, "A",
"List of all hostcache entries");
+SYSCTL_PROC(_net_inet_tcp_hostcache, OID_AUTO, histo,
+ CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_SKIP | CTLFLAG_MPSAFE,
+ 0, 0, sysctl_tcp_hc_histo, "A",
+ "Print a histogram of hostcache hashbucket utilization");
+
SYSCTL_PROC(_net_inet_tcp_hostcache, OID_AUTO, purgenow,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
NULL, 0, sysctl_tcp_hc_purgenow, "I",
@@ -698,6 +704,75 @@
return(error);
}
+/*
+ * Sysctl function: prints a histogram of the hostcache hashbucket
+ * utilization.
+ */
+static int
+sysctl_tcp_hc_histo(SYSCTL_HANDLER_ARGS)
+{
+ const int linesize = 128;
+ struct sbuf sb;
+ int i, error, n;
+ int *histo_cnt, *histo_tailq;
+ int hch_length;
+ struct hc_metrics *hc_entry;
+
+ if (jailed_without_vnet(curthread->td_ucred) != 0)
+ return (EPERM);
+
+ error = sysctl_wire_old_buffer(req, 0);
+ if (error != 0) {
+ return(error);
+ }
+
+ histo_cnt = (int *)malloc(sizeof(int) * V_tcp_hostcache.bucket_limit, M_TEMP, M_NOWAIT|M_ZERO);
+ if (histo_cnt == NULL) {
+ return(ENOMEM);
+ }
+ histo_tailq = (int *)malloc(sizeof(int) * V_tcp_hostcache.bucket_limit, M_TEMP, M_NOWAIT|M_ZERO);
+ if (histo_tailq == NULL) {
+ free(histo_cnt, M_TEMP);
+ return(ENOMEM);
+ }
+
+ /* Use a buffer for 16 lines */
+ sbuf_new_for_sysctl(&sb, NULL, 16 * linesize, req);
+
+ for (i = 0; i < V_tcp_hostcache.hashsize; i++) {
+ hch_length = V_tcp_hostcache.hashbase[i].hch_length;
+ if (hch_length < V_tcp_hostcache.bucket_limit) {
+ histo_cnt[hch_length]++;
+ } else {
+ sbuf_printf(&sb, "hostcache hash length at %u: %u\n",
+ i, hch_length);
+ }
+ n = 0;
+ THC_LOCK(&V_tcp_hostcache.hashbase[i].hch_mtx);
+ TAILQ_FOREACH(hc_entry, &V_tcp_hostcache.hashbase[i].hch_bucket,
+ rmx_q) {
+ n++;
+ }
+ THC_UNLOCK(&V_tcp_hostcache.hashbase[i].hch_mtx);
+ if (n < V_tcp_hostcache.bucket_limit) {
+ histo_tailq[n]++;
+ } else {
+ sbuf_printf(&sb, "hostcache bucket length at %u: %u\n",
+ i, n);
+ }
+ }
+
+ sbuf_printf(&sb, "\nLength\tCount\tList\n");
+ for (i = 0; i < V_tcp_hostcache.bucket_limit; i++) {
+ sbuf_printf(&sb, "%u\t%u\t%u\n", i, histo_cnt[i], histo_tailq[i]);
+ }
+ error = sbuf_finish(&sb);
+ sbuf_delete(&sb);
+ free(histo_cnt, M_TEMP);
+ free(histo_tailq, M_TEMP);
+ return(error);
+}
+
/*
* Caller has to make sure the curvnet is set properly.
*/

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