Add support for write_iops_log

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/HOWTO b/HOWTO
index cc2df9b..24a0f3b 100644
--- a/HOWTO
+++ b/HOWTO
@@ -864,6 +864,9 @@
 bwavgtime=int	Average the calculated bandwidth over the given time. Value
 		is specified in milliseconds.
 
+iopsavgtime=int	Average the calculated IOPS over the given time. Value
+		is specified in milliseconds.
+
 create_serialize=bool	If true, serialize the file creating for the jobs.
 			This may be handy to avoid interleaving of data
 			files, which may greatly depend on the filesystem
@@ -1104,6 +1107,9 @@
 		and foo_lat.log. This helps fio_generate_plot fine the logs
 		automatically.
 
+write_bw_log=str If given, write an IOPS log of the jobs in this job
+		file. See write_bw_log.
+
 lockmem=int	Pin down the specified amount of memory with mlock(2). Can
 		potentially be used instead of removing memory or booting
 		with less memory to simulate a smaller amount of memory.