Revert "H2O: Track connection load across the worker threads (#9520)" (#10355)

This reverts commit 05166707892801160d9141dad4b77f6da0c9f9f7.

frameworks/C/h2o/src/event_loop.c

@@ -32,16 +32,13 @@
 #include <netinet/tcp.h>
 #include <openssl/ssl.h>
 #include <sys/socket.h>
-#include <sys/syscall.h>
 #include <sys/types.h>
 
 #include "error.h"
 #include "event_loop.h"
 #include "global_data.h"
 #include "thread.h"
-#include "utility.h"
 
-#define CONN_NUM_SAMPLE_PERIOD 2500
 #define DEFAULT_TCP_FASTOPEN_QUEUE_LEN 4096
 
 static void accept_connection(h2o_socket_t *listener, const char *err);
@@ -80,7 +77,6 @@ static void accept_connection(h2o_socket_t *listener, const char *err)
 				if (!sock)
 					break;
 
-				ctx->event_loop.accepted_conn_num++;
 				ctx->event_loop.conn_num++;
 				sock->on_close.cb = on_close_connection;
 				sock->on_close.data = &ctx->event_loop.conn_num;
@@ -299,36 +295,11 @@ static void start_accept_polling(bool is_main_thread,
 
 void event_loop(struct thread_context_t *ctx)
 {
-	uint64_t last_sample = 0;
-
 	while (!ctx->shutdown || ctx->event_loop.conn_num) {
 		h2o_evloop_run(ctx->event_loop.h2o_ctx.loop, INT32_MAX);
 		process_messages(&ctx->global_thread_data->h2o_receiver,
 		                 &ctx->event_loop.local_messages);
-
-		const uint64_t now = h2o_now(ctx->event_loop.h2o_ctx.loop);
-
-		if (now - last_sample > CONN_NUM_SAMPLE_PERIOD || last_sample > now) {
-			const size_t i = ctx->event_loop.conn_num_sample_idx;
-
-			ctx->event_loop.conn_num_sample[i] = ctx->event_loop.conn_num;
-			ctx->event_loop.conn_num_sample_idx =
-				(i + 1) % ARRAY_SIZE(ctx->event_loop.conn_num_sample);
-			last_sample = now;
-		}
 	}
-
-	flockfile(stdout);
-	printf("Thread %ld statistics:\nAccepted connections: %zu\nConnection number samples: %zu",
-	       syscall(SYS_gettid),
-	       ctx->event_loop.accepted_conn_num,
-	       *ctx->event_loop.conn_num_sample);
-
-	for (size_t i = 1; i < ARRAY_SIZE(ctx->event_loop.conn_num_sample); i++)
-		printf(",%zu", ctx->event_loop.conn_num_sample[i]);
-
-	putc_unlocked('\n', stdout);
-	funlockfile(stdout);
 }
 
 void free_event_loop(event_loop_t *event_loop, h2o_multithread_receiver_t *h2o_receiver)

frameworks/C/h2o/src/event_loop.h

@@ -27,8 +27,6 @@
 
 #include "global_data.h"
 
-#define CONN_NUM_SAMPLES 512
-
 typedef enum {
 	SHUTDOWN,
 	TASK
@@ -43,9 +41,6 @@ typedef struct {
 	h2o_accept_ctx_t h2o_accept_ctx;
 	h2o_context_t h2o_ctx;
 	h2o_linklist_t local_messages;
-	size_t accepted_conn_num;
-	size_t conn_num_sample[CONN_NUM_SAMPLES];
-	size_t conn_num_sample_idx;
 } event_loop_t;
 
 typedef struct {