When set, trim IOs will be submitted as blkioq_write_zeroes() requests
instead of blkioq_discard() requests.
Signed-off-by: Alberto Faria <afaria@xxxxxxxxxx>
---
HOWTO.rst | 5 +++++
engines/libblkio.c | 20 ++++++++++++++++++--
fio.1 | 4 ++++
3 files changed, 27 insertions(+), 2 deletions(-)
diff --git a/HOWTO.rst b/HOWTO.rst
index b9c7c8df..7155add6 100644
--- a/HOWTO.rst
+++ b/HOWTO.rst
@@ -2879,6 +2879,11 @@ with the caveat that when used on the command line, they must come after the
Submit vectored read and write requests. Default is 0.
+.. option:: libblkio_write_zeroes_on_trim=bool : [libblkio]
+
+ Submit trims as "write zeroes" requests instead of discard requests.
+ Default is 0.
+
I/O depth
~~~~~~~~~
diff --git a/engines/libblkio.c b/engines/libblkio.c
index dcf701ad..79af3aa7 100644
--- a/engines/libblkio.c
+++ b/engines/libblkio.c
@@ -29,6 +29,7 @@ struct fio_blkio_options {
unsigned int hipri;
unsigned int vectored;
+ unsigned int write_zeroes_on_trim;
};
static struct fio_option options[] = {
@@ -78,6 +79,16 @@ static struct fio_option options[] = {
.category = FIO_OPT_C_ENGINE,
.group = FIO_OPT_G_LIBBLKIO,
},
+ {
+ .name = "libblkio_write_zeroes_on_trim",
+ .lname = "Use blkioq_write_zeroes() for TRIM",
+ .type = FIO_OPT_STR_SET,
+ .off1 = offsetof(struct fio_blkio_options,
+ write_zeroes_on_trim),
+ .help = "Use blkioq_write_zeroes() for TRIM instead of blkioq_discard()",
+ .category = FIO_OPT_C_ENGINE,
+ .group = FIO_OPT_G_LIBBLKIO,
+ },
{
.name = NULL,
@@ -484,8 +495,13 @@ static enum fio_q_status fio_blkio_queue(struct thread_data *td,
break;
case DDIR_TRIM:
- blkioq_discard(data->q, io_u->offset, io_u->xfer_buflen,
- io_u, 0);
+ if (options->write_zeroes_on_trim) {
+ blkioq_write_zeroes(data->q, io_u->offset,
+ io_u->xfer_buflen, io_u, 0);
+ } else {
+ blkioq_discard(data->q, io_u->offset,
+ io_u->xfer_buflen, io_u, 0);
+ }
break;
case DDIR_SYNC:
diff --git a/fio.1 b/fio.1
index a403b415..053c2eda 100644
--- a/fio.1
+++ b/fio.1
@@ -2626,6 +2626,10 @@ Use poll queues.
.TP
.BI (libblkio)libblkio_vectored \fR=\fPbool
Submit vectored read and write requests. Default is 0.
+.TP
+.BI (libblkio)libblkio_write_zeroes_on_trim \fR=\fPbool
+Submit trims as "write zeroes" requests instead of discard requests. Default is
+0.
.SS "I/O depth"
.TP
.BI iodepth \fR=\fPint
--
2.38.1
