engines/io_uring: add support for registered files

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 4201e2e946f0a4594eb04f778eee575122696536..6b449e97029b674525983ac158e5b40881f1b733 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -2033,6 +2033,12 @@ with the caveat that when used on the command line, they must come after the
        map and release for each IO. This is more efficient, and reduces the
        IO latency as well.
 
+.. option:: registerfiles : [io_uring]
+       With this option, fio registers the set of files being used with the
+       kernel. This avoids the overhead of managing file counts in the kernel,
+       making the submission and completion part more lightweight. Required
+       for the below :option:`sqthread_poll` option.
+
 .. option:: sqthread_poll : [io_uring]
 
        Normally fio will submit IO by issuing a system call to notify the