Avoiding bio cloning (aka noclone) offers a slight advantage over bio
cloning for this read workload:
fio --ioengine=psync --iodepth=1 --rw=read --bs=512 --direct=1 \
--numjobs=12 --time_based --runtime=10 --group_reporting
--name=/dev/mapper/mpath
clone 3331MB/s 3337MB/s 3355MB/s
noclone 3418MB/s 3407MB/s 3420MB/s
Signed-off-by: Mike Snitzer <[email protected]>
---
drivers/md/dm-mpath.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 2ee5e357a0a7..579330cd7a6a 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1178,9 +1178,10 @@ static int multipath_ctr(struct dm_target *ti, unsigned
argc, char **argv)
ti->num_discard_bios = 1;
ti->num_write_same_bios = 1;
ti->num_write_zeroes_bios = 1;
- if (m->queue_mode == DM_TYPE_BIO_BASED)
+ if (m->queue_mode == DM_TYPE_BIO_BASED) {
+ ti->no_clone = true;
ti->per_io_data_size = multipath_per_bio_data_size();
- else
+ } else
ti->per_io_data_size = sizeof(struct dm_mpath_io);
return 0;
@@ -1584,11 +1585,11 @@ static int multipath_end_io(struct dm_target *ti,
struct request *clone,
return r;
}
-static int multipath_end_io_bio(struct dm_target *ti, struct bio *clone,
+static int multipath_end_io_bio(struct dm_target *ti, struct bio *bio,
blk_status_t *error)
{
struct multipath *m = ti->private;
- struct dm_mpath_io *mpio = get_mpio_from_bio(clone);
+ struct dm_mpath_io *mpio = get_mpio_from_bio(bio);
struct pgpath *pgpath = mpio->pgpath;
unsigned long flags;
int r = DM_ENDIO_DONE;
@@ -1611,7 +1612,7 @@ static int multipath_end_io_bio(struct dm_target *ti,
struct bio *clone,
}
spin_lock_irqsave(&m->lock, flags);
- bio_list_add(&m->queued_bios, clone);
+ bio_list_add(&m->queued_bios, bio);
spin_unlock_irqrestore(&m->lock, flags);
if (!test_bit(MPATHF_QUEUE_IO, &m->flags))
queue_work(kmultipathd, &m->process_queued_bios);
@@ -2011,7 +2012,7 @@ static int multipath_busy(struct dm_target *ti)
*---------------------------------------------------------------*/
static struct target_type multipath_target = {
.name = "multipath",
- .version = {1, 13, 0},
+ .version = {1, 14, 0},
.features = DM_TARGET_SINGLETON | DM_TARGET_IMMUTABLE |
DM_TARGET_PASSES_INTEGRITY,
.module = THIS_MODULE,
--
2.15.0
--
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