fix: agent - eBPF Correct the maximum data push delay

agent/src/ebpf/kernel/include/socket_trace.h

@@ -34,6 +34,8 @@
 #define INFER_CONTINUE	1
 #define INFER_TERMINATE	2
 
+#define MAX_PUSH_DELAY_TIME_NS 100000000ULL // 100ms
+
 typedef long unsigned int __kernel_size_t;
 
 enum {

agent/src/ebpf/kernel/socket_trace.bpf.c

@@ -2734,16 +2734,9 @@ static __inline int finalize_data_output(void *ctx,
 	v_buff->events_num = 0;
 	v_buff->len = 0;
 	if (diff > PERIODIC_PUSH_DELAY_THRESHOLD_NS) {
-		__u32 k0 = 0;
-		struct trace_stats *stats;
 		tracer_ctx->last_period_timestamp =
 		    tracer_ctx->period_timestamp;
 		tracer_ctx->period_timestamp = curr_time;
-		stats = trace_stats_map__lookup(&k0);
-		if (stats == NULL)
-			return -1;
-		if (diff > stats->period_event_max_delay)
-			stats->period_event_max_delay = diff;
 	}
 
 	return 0;
@@ -3384,8 +3377,11 @@ static __inline int push_socket_data(struct syscall_comm_enter_ctx *ctx)
 
 			v_buff->events_num = 0;
 			v_buff->len = 0;
-			if (diff > trace_stats->period_event_max_delay)
-				trace_stats->period_event_max_delay = diff;
+			if (diff > MAX_PUSH_DELAY_TIME_NS) {
+				// Indicates that a delay occurred in this data push.
+				__sync_fetch_and_add(&trace_stats->period_event_max_delay, 1);
+			}
+
 		}
 	}
 

agent/src/ebpf/user/config.h

@@ -266,7 +266,12 @@ enum cfg_feature_idx {
  * the data resident in the eBPF buffer. This value is the periodic time, unit
  * is milliseconds.
  */
-#define KICK_KERN_PERIOD 40000000  // Set default interval to 30 milliseconds
+#define KICK_KERN_PERIOD 40000000  // Set default interval to 40 milliseconds
+/*
+ * A special value should be assigned to indicate the case where no data has
+ * been pushed after exceeding 100 milliseconds.
+ */
+#define PUSH_DELAY_EXCEEDED_MARKER 199000 // 199 ms
 
 /*
  * timer config

agent/src/ebpf/user/socket.c

@@ -2701,8 +2701,7 @@ struct socket_trace_stats socket_tracer_stats(void)
 			     stats_total.period_event_count) / NS_IN_USEC;
 
 		if (stats_total.period_event_max_delay > 0) {
-			stats.period_push_max_delay =
-			    stats_total.period_event_max_delay / NS_IN_USEC;
+			stats.period_push_max_delay = PUSH_DELAY_EXCEEDED_MARKER;
 		} else {
 			stats.period_push_max_delay = stats.period_push_avg_delay;
 		}