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dm: add full blk-mq support to request-based DM

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Commit e5863d9ad ("dm: allocate requests in target when stacking on
blk-mq devices") served as the first step toward fully utilizing blk-mq
in request-based DM -- it enabled stacking an old-style (request_fn)
request_queue ontop of the underlying blk-mq device(s).  That first step
didn't improve performance of DM multipath ontop of fast blk-mq devices
(e.g. NVMe) because the top-level old-style request_queue was severely
limited by the queue_lock.

The second step offered here enables stacking a blk-mq request_queue
ontop of the underlying blk-mq device(s).  This unlocks significant
performance gains on fast blk-mq devices, Keith Busch tested on his NVMe
testbed and offered this really positive news:

 "Just providing a performance update. All my fio tests are getting
  roughly equal performance whether accessed through the raw block
  device or the multipath device mapper (~470k IOPS). I could only push
  ~20% of the raw iops through dm before this conversion, so this latest
  tree is looking really solid from a performance standpoint."

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Tested-by: Keith Busch <keith.busch@intel.com>
This commit is contained in:
Mike Snitzer
2015-03-08 00:51:47 -05:00
parent 0ce65797a7
commit bfebd1cdb4
4 changed files with 261 additions and 73 deletions
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2
drivers/md/dm-mpath.c
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@@ -1703,7 +1703,7 @@ out:
*---------------------------------------------------------------*/
static struct target_type multipath_target = {
.name = "multipath",
.version = {1, 8, 0},
.version = {1, 9, 0},
.module = THIS_MODULE,
.ctr = multipath_ctr,
.dtr = multipath_dtr,

11
drivers/md/dm-table.c
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@@ -18,6 +18,7 @@
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/atomic.h>
#include <linux/blk-mq.h>
#define DM_MSG_PREFIX "table"
@@ -1695,9 +1696,13 @@ void dm_table_run_md_queue_async(struct dm_table *t)
md = dm_table_get_md(t);
queue = dm_get_md_queue(md);
if (queue) {
spin_lock_irqsave(queue->queue_lock, flags);
blk_run_queue_async(queue);
spin_unlock_irqrestore(queue->queue_lock, flags);
if (queue->mq_ops)
blk_mq_run_hw_queues(queue, true);
else {
spin_lock_irqsave(queue->queue_lock, flags);
blk_run_queue_async(queue);
spin_unlock_irqrestore(queue->queue_lock, flags);
}
}
}
EXPORT_SYMBOL(dm_table_run_md_queue_async);

317
drivers/md/dm.c
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File diff suppressed because it is too large Load Diff

4
include/uapi/linux/dm-ioctl.h
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@@ -267,9 +267,9 @@ enum {
#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
#define DM_VERSION_MINOR 30
#define DM_VERSION_MINOR 31
#define DM_VERSION_PATCHLEVEL 0
#define DM_VERSION_EXTRA "-ioctl (2014-12-22)"
#define DM_VERSION_EXTRA "-ioctl (2015-3-12)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */