md: remove plug_cnt feature of plugging.

This seemed like a good idea at the time, but after further thought I
cannot see it making a difference other than very occasionally and
testing to try to exercise the case it is most likely to help did not
show any performance difference by removing it.

So remove the counting of active plugs and allow 'pending writes' to
be activated at any time, not just when no plugs are active.

This is only relevant when there is a write-intent bitmap, and the
updating of the bitmap will likely introduce enough delay that
the single-threading of bitmap updates will be enough to collect large
numbers of updates together.

Removing this will make it easier to centralise the unplug code, and
will clear the other for other unplug enhancements which have a
measurable effect.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 1 insertions, 4 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index d5ab4493c8be..34381172a947 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -514,8 +514,7 @@ struct md_plug_cb {
 static void plugger_unplug(struct blk_plug_cb *cb)
 {
         struct md_plug_cb *mdcb = container_of(cb, struct md_plug_cb, cb);
-        if (atomic_dec_and_test(&mdcb->mddev->plug_cnt))
-                md_wakeup_thread(mdcb->mddev->thread);
+        md_wakeup_thread(mdcb->mddev->thread);
         kfree(mdcb);
 }
 
@@ -548,7 +547,6 @@ int mddev_check_plugged(struct mddev *mddev)
 
         mdcb->mddev = mddev;
         mdcb->cb.callback = plugger_unplug;
-        atomic_inc(&mddev->plug_cnt);
         list_add(&mdcb->cb.list, &plug->cb_list);
         return 1;
 }
@@ -602,7 +600,6 @@ void mddev_init(struct mddev *mddev)
         atomic_set(&mddev->active, 1);
         atomic_set(&mddev->openers, 0);
         atomic_set(&mddev->active_io, 0);
-        atomic_set(&mddev->plug_cnt, 0);
         spin_lock_init(&mddev->write_lock);
         atomic_set(&mddev->flush_pending, 0);
         init_waitqueue_head(&mddev->sb_wait);