From ff3aa922570c22b99b7ae8714e04a79d0d0eddb7 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Tue, 20 Nov 2018 11:59:36 -0700
Subject: [PATCH] Kill "No I/O performed by ..." message

We keep finding false triggers for this, and it's driving me
nuts. Kill it with fire.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 backend.c | 19 +------------------
 1 file changed, 1 insertion(+), 18 deletions(-)

Index: fio-3.7/backend.c
===================================================================
--- fio-3.7.orig/backend.c
+++ fio-3.7/backend.c
@@ -1519,7 +1519,7 @@ static void *thread_main(void *data)
 	struct sk_out *sk_out = fd->sk_out;
 	uint64_t bytes_done[DDIR_RWDIR_CNT];
 	int deadlock_loop_cnt;
-	bool clear_state, did_some_io;
+	bool clear_state;
 	int ret;
 
 	sk_out_assign(sk_out);
@@ -1738,7 +1738,6 @@ static void *thread_main(void *data)
 
 	memset(bytes_done, 0, sizeof(bytes_done));
 	clear_state = false;
-	did_some_io = false;
 
 	while (keep_running(td)) {
 		uint64_t verify_bytes;
@@ -1816,9 +1815,6 @@ static void *thread_main(void *data)
 		    td_ioengine_flagged(td, FIO_UNIDIR))
 			continue;
 
-		if (ddir_rw_sum(bytes_done))
-			did_some_io = true;
-
 		clear_io_state(td, 0);
 
 		fio_gettime(&td->start, NULL);
@@ -1839,19 +1835,6 @@ static void *thread_main(void *data)
 			break;
 	}
 
-	/*
-	 * If td ended up with no I/O when it should have had,
-	 * then something went wrong unless FIO_NOIO or FIO_DISKLESSIO.
-	 * (Are we not missing other flags that can be ignored ?)
-	 */
-	if ((td->o.size || td->o.io_size) && !ddir_rw_sum(bytes_done) &&
-	    !did_some_io && !td->o.create_only &&
-	    !(td_ioengine_flagged(td, FIO_NOIO) ||
-	      td_ioengine_flagged(td, FIO_DISKLESSIO)))
-		log_err("%s: No I/O performed by %s, "
-			 "perhaps try --debug=io option for details?\n",
-			 td->o.name, td->io_ops->name);
-
 	td_set_runstate(td, TD_FINISHING);
 
 	update_rusage_stat(td);