From: Jens Axboe <jens.axboe@oracle.com>
Date: Mon, 5 Jan 2009 18:06:39 +0000 (+0100)
Subject: Add --debug=mutex
X-Git-Tag: fio-1.24~16
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=29adda3ce304f16036cafee6c099aa08444a7db1

Add --debug=mutex

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/README b/README
index c5598109..dd3bab11 100644
--- a/README
+++ b/README
@@ -126,6 +126,7 @@ options in fio. Currently the options are:
 	parse		Dump info related to option matching and parsing
 	diskutil	Dump info related to disk utilization updates
 	job:x		Dump info only related to job number x
+	mutex		Dump info only related to mutex up/down ops
 	? or help	Show available debug options.
 
 You can specify as many as you want, eg --debug=file,mem will enable
diff --git a/debug.h b/debug.h
index a9e9e935..1a2b79ab 100644
--- a/debug.h
+++ b/debug.h
@@ -15,6 +15,7 @@ enum {
 	FD_PARSE,
 	FD_DISKUTIL,
 	FD_JOB,
+	FD_MUTEX,
 	FD_DEBUG_MAX,
 };
 
diff --git a/fio.c b/fio.c
index 30b40cc7..5a40004f 100644
--- a/fio.c
+++ b/fio.c
@@ -941,8 +941,11 @@ static void *thread_main(void *data)
 	td->io_hist_tree = RB_ROOT;
 
 	td_set_runstate(td, TD_INITIALIZED);
+	dprint(FD_MUTEX, "up startup_mutex\n");
 	fio_mutex_up(startup_mutex);
+	dprint(FD_MUTEX, "wait on td->mutex\n");
 	fio_mutex_down(td->mutex);
+	dprint(FD_MUTEX, "done waiting on td->mutex\n");
 
 	/*
 	 * the ->mutex mutex is now no longer used, close it to avoid
@@ -1280,7 +1283,9 @@ static int fio_start_gtod_thread(void)
 		return 1;
 	}
 
+	dprint(FD_MUTEX, "wait on startup_mutex\n");
 	fio_mutex_down(startup_mutex);
+	dprint(FD_MUTEX, "done waiting on startup_mutex\n");
 	return 0;
 }
 
@@ -1422,7 +1427,9 @@ static void run_threads(void)
 				} else if (i == fio_debug_jobno)
 					*fio_debug_jobp = pid;
 			}
+			dprint(FD_MUTEX, "wait on startup_mutex\n");
 			fio_mutex_down(startup_mutex);
+			dprint(FD_MUTEX, "done waiting on startup_mutex\n");
 		}
 
 		/*
diff --git a/init.c b/init.c
index 3142d8ca..1adc004b 100644
--- a/init.c
+++ b/init.c
@@ -895,6 +895,7 @@ struct debug_level debug_levels[] = {
 	{ .name = "parse",	.shift = FD_PARSE },
 	{ .name = "diskutil",	.shift = FD_DISKUTIL },
 	{ .name = "job",	.shift = FD_JOB },
+	{ .name = "mutex",	.shift = FD_MUTEX },
 	{ .name = NULL, },
 };