unsigned int cl_log_debug;
unsigned int cl_protocol;
unsigned int cl_timewarn_cs;
+ unsigned int cl_waitwarn_us;
};
enum {
CLUSTER_ATTR_LOG_DEBUG,
CLUSTER_ATTR_PROTOCOL,
CLUSTER_ATTR_TIMEWARN_CS,
+ CLUSTER_ATTR_WAITWARN_US,
};
struct cluster_attribute {
CLUSTER_ATTR(log_debug, 0);
CLUSTER_ATTR(protocol, 0);
CLUSTER_ATTR(timewarn_cs, 1);
+CLUSTER_ATTR(waitwarn_us, 0);
static struct configfs_attribute *cluster_attrs[] = {
[CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
[CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
[CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
[CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
+ [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
NULL,
};
cl->cl_log_debug = dlm_config.ci_log_debug;
cl->cl_protocol = dlm_config.ci_protocol;
cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
+ cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
space_list = &sps->ss_group;
comm_list = &cms->cs_group;
#define DEFAULT_LOG_DEBUG 0
#define DEFAULT_PROTOCOL 0
#define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
+#define DEFAULT_WAITWARN_US 0
struct dlm_config_info dlm_config = {
.ci_tcp_port = DEFAULT_TCP_PORT,
.ci_scan_secs = DEFAULT_SCAN_SECS,
.ci_log_debug = DEFAULT_LOG_DEBUG,
.ci_protocol = DEFAULT_PROTOCOL,
- .ci_timewarn_cs = DEFAULT_TIMEWARN_CS
+ .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
+ .ci_waitwarn_us = DEFAULT_WAITWARN_US
};
return -1;
}
+static int nodeid_warned(int nodeid, int num_nodes, int *warned)
+{
+ int i;
+
+ for (i = 0; i < num_nodes; i++) {
+ if (!warned[i]) {
+ warned[i] = nodeid;
+ return 0;
+ }
+ if (warned[i] == nodeid)
+ return 1;
+ }
+ return 0;
+}
+
+void dlm_scan_waiters(struct dlm_ls *ls)
+{
+ struct dlm_lkb *lkb;
+ ktime_t zero = ktime_set(0, 0);
+ s64 us;
+ s64 debug_maxus = 0;
+ u32 debug_scanned = 0;
+ u32 debug_expired = 0;
+ int num_nodes = 0;
+ int *warned = NULL;
+
+ if (!dlm_config.ci_waitwarn_us)
+ return;
+
+ mutex_lock(&ls->ls_waiters_mutex);
+
+ list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
+ if (ktime_equal(lkb->lkb_wait_time, zero))
+ continue;
+
+ debug_scanned++;
+
+ us = ktime_to_us(ktime_sub(ktime_get(), lkb->lkb_wait_time));
+
+ if (us < dlm_config.ci_waitwarn_us)
+ continue;
+
+ lkb->lkb_wait_time = zero;
+
+ debug_expired++;
+ if (us > debug_maxus)
+ debug_maxus = us;
+
+ if (!num_nodes) {
+ num_nodes = ls->ls_num_nodes;
+ warned = kmalloc(GFP_KERNEL, num_nodes * sizeof(int));
+ if (warned)
+ memset(warned, 0, num_nodes * sizeof(int));
+ }
+ if (!warned)
+ continue;
+ if (nodeid_warned(lkb->lkb_wait_nodeid, num_nodes, warned))
+ continue;
+
+ log_error(ls, "waitwarn %x %lld %d us check connection to "
+ "node %d", lkb->lkb_id, (long long)us,
+ dlm_config.ci_waitwarn_us, lkb->lkb_wait_nodeid);
+ }
+ mutex_unlock(&ls->ls_waiters_mutex);
+
+ if (warned)
+ kfree(warned);
+
+ if (debug_expired)
+ log_debug(ls, "scan_waiters %u warn %u over %d us max %lld us",
+ debug_scanned, debug_expired,
+ dlm_config.ci_waitwarn_us, (long long)debug_maxus);
+}
+
/* add/remove lkb from global waiters list of lkb's waiting for
a reply from a remote node */
-static int add_to_waiters(struct dlm_lkb *lkb, int mstype)
+static int add_to_waiters(struct dlm_lkb *lkb, int mstype, int to_nodeid)
{
struct dlm_ls *ls = lkb->lkb_resource->res_ls;
int error = 0;
lkb->lkb_wait_count++;
lkb->lkb_wait_type = mstype;
+ lkb->lkb_wait_time = ktime_get();
+ lkb->lkb_wait_nodeid = to_nodeid; /* for debugging */
hold_lkb(lkb);
list_add(&lkb->lkb_wait_reply, &ls->ls_waiters);
out:
list_for_each_entry(lkb, &ls->ls_timeout, lkb_time_list)
lkb->lkb_timestamp = ktime_add_us(lkb->lkb_timestamp, adj_us);
mutex_unlock(&ls->ls_timeout_mutex);
+
+ if (!dlm_config.ci_waitwarn_us)
+ return;
+
+ mutex_lock(&ls->ls_waiters_mutex);
+ list_for_each_entry(lkb, &ls->ls_waiters, lkb_wait_reply) {
+ if (ktime_to_us(lkb->lkb_wait_time))
+ lkb->lkb_wait_time = ktime_get();
+ }
+ mutex_unlock(&ls->ls_waiters_mutex);
}
/* lkb is master or local copy */
struct dlm_mhandle *mh;
int to_nodeid, error;
- error = add_to_waiters(lkb, mstype);
+ to_nodeid = r->res_nodeid;
+
+ error = add_to_waiters(lkb, mstype, to_nodeid);
if (error)
return error;
- to_nodeid = r->res_nodeid;
-
error = create_message(r, lkb, to_nodeid, mstype, &ms, &mh);
if (error)
goto fail;
struct dlm_mhandle *mh;
int to_nodeid, error;
- error = add_to_waiters(lkb, DLM_MSG_LOOKUP);
+ to_nodeid = dlm_dir_nodeid(r);
+
+ error = add_to_waiters(lkb, DLM_MSG_LOOKUP, to_nodeid);
if (error)
return error;
- to_nodeid = dlm_dir_nodeid(r);
-
error = create_message(r, NULL, to_nodeid, DLM_MSG_LOOKUP, &ms, &mh);
if (error)
goto fail;