Recent changes (master)

[Jens Axboe <axboe@kernel.dk>]

The following changes since commit f2415d711a11fec6d5e4081a7bdc060b98c76043:

  t/io_uring: fix size confusion in allocate_mem() (2024-11-05 07:57:41 -0700)

are available in the Git repository at:

  git://git.kernel.dk/fio.git master

for you to fetch changes up to dc03e3788e2b47281b67e9354a7ff02a3053264a:

  docs: explain type of memory allocated by md_per_io_size (2024-11-22 19:50:06 +0000)

----------------------------------------------------------------
Vincent Fu (2):
      engines/io_uring_cmd: disable iomem=malloc check for metadata
      docs: explain type of memory allocated by md_per_io_size

 HOWTO.rst          |  4 +++-
 engines/io_uring.c | 10 ++--------
 fio.1              |  4 +++-
 3 files changed, 8 insertions(+), 10 deletions(-)

---

Diff of recent changes:

diff --git a/HOWTO.rst b/HOWTO.rst
index 2a57f60a..504a64b8 100644
--- a/HOWTO.rst
+++ b/HOWTO.rst
@@ -2591,7 +2591,9 @@ with the caveat that when used on the command line, they must come after the
 
 .. option:: md_per_io_size=int : [io_uring_cmd] [xnvme]
 
-	Size in bytes for separate metadata buffer per IO. Default: 0.
+        Size in bytes for separate metadata buffer per IO. For io_uring_cmd
+        these buffers are allocated using malloc regardless of what is set for
+        :option:`iomem`. Default: 0.
 
 .. option:: pi_act=int : [io_uring_cmd] [xnvme]
 
diff --git a/engines/io_uring.c b/engines/io_uring.c
index 79eacbc4..facc967f 100644
--- a/engines/io_uring.c
+++ b/engines/io_uring.c
@@ -1353,14 +1353,8 @@ static int fio_ioring_init(struct thread_data *td)
 		md_size += page_mask + td->o.mem_align;
 		if (td->o.mem_align && td->o.mem_align > page_size)
 			md_size += td->o.mem_align - page_size;
-		if (td->o.mem_type == MEM_MALLOC) {
-			ld->md_buf = malloc(md_size);
-			if (!ld->md_buf) {
-				free(ld);
-				return 1;
-			}
-		} else {
-			log_err("fio: Only iomem=malloc or mem=malloc is supported\n");
+		ld->md_buf = malloc(md_size);
+		if (!ld->md_buf) {
 			free(ld);
 			return 1;
 		}
diff --git a/fio.1 b/fio.1
index 53fb7849..3c5f02b3 100644
--- a/fio.1
+++ b/fio.1
@@ -2361,7 +2361,9 @@ this option is specified, the option \fBplids\fP or \fBfdp_pli\fP will be ignore
 .RE
 .TP
 .BI (io_uring_cmd,xnvme)md_per_io_size \fR=\fPint
-Size in bytes for separate metadata buffer per IO. Default: 0.
+Size in bytes for separate metadata buffer per IO. For io_uring_cmd these
+buffers are allocated using malloc regardless of what is set for \fBiomem\fR.
+Default: 0.
 .TP
 .BI (io_uring_cmd,xnvme)pi_act \fR=\fPint
 Action to take when nvme namespace is formatted with protection information.