diff options
| author | Mike Snitzer <snitzer@redhat.com> | 2015-03-11 20:01:09 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2015-04-15 18:10:17 +0200 |
| commit | 17e149b8f73ba116e71e25930dd6f2eb3828792d (patch) | |
| tree | 6407112dbb113ffeebfd0620df27d4f67cd27ed1 /drivers/md/dm-sysfs.c | |
| parent | dm: optimize dm_mq_queue_rq to _not_ use kthread if using pure blk-mq (diff) | |
| download | linux-17e149b8f73ba116e71e25930dd6f2eb3828792d.tar.xz linux-17e149b8f73ba116e71e25930dd6f2eb3828792d.zip | |
dm: add 'use_blk_mq' module param and expose in per-device ro sysfs attr
Request-based DM's blk-mq support defaults to off; but a user can easily
change the default using the dm_mod.use_blk_mq module/boot option.
Also, you can check what mode a given request-based DM device is using
with: cat /sys/block/dm-X/dm/use_blk_mq
This change enabled further cleanup and reduced work (e.g. the
md->io_pool and md->rq_pool isn't created if using blk-mq).
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-sysfs.c')
| -rw-r--r-- | drivers/md/dm-sysfs.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/md/dm-sysfs.c b/drivers/md/dm-sysfs.c index f5bb3944f75e..7e818f5f1dc4 100644 --- a/drivers/md/dm-sysfs.c +++ b/drivers/md/dm-sysfs.c @@ -89,15 +89,24 @@ static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf) return strlen(buf); } +static ssize_t dm_attr_use_blk_mq_show(struct mapped_device *md, char *buf) +{ + sprintf(buf, "%d\n", dm_use_blk_mq(md)); + + return strlen(buf); +} + static DM_ATTR_RO(name); static DM_ATTR_RO(uuid); static DM_ATTR_RO(suspended); +static DM_ATTR_RO(use_blk_mq); static DM_ATTR_RW(rq_based_seq_io_merge_deadline); static struct attribute *dm_attrs[] = { &dm_attr_name.attr, &dm_attr_uuid.attr, &dm_attr_suspended.attr, + &dm_attr_use_blk_mq.attr, &dm_attr_rq_based_seq_io_merge_deadline.attr, NULL, }; |