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drbd: try hard to max out the updates per AL transaction

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There may have been more incoming requests while we where preparing
the current transaction. Try to consolidate more updates into this
transaction until we make no more progres.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Lars Ellenberg 2013-03-19 18:16:58 +01:00 committed by Jens Axboe
parent 7e8c288f6c
commit 45ad07b3ac
1 changed files with 31 additions and 0 deletions
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31
drivers/block/drbd/drbd_req.c
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@ -1226,6 +1226,37 @@ void do_submit(struct work_struct *ws)
break;
wait_event(mdev->al_wait, prepare_al_transaction_nonblock(mdev, &incoming, &pending));
/* Maybe more was queued, while we prepared the transaction?
* Try to stuff them into this transaction as well.
* Be strictly non-blocking here, no wait_event, we already
* have something to commit.
* Stop if we don't make any more progres.
*/
for (;;) {
LIST_HEAD(more_pending);
LIST_HEAD(more_incoming);
bool made_progress;
/* It is ok to look outside the lock,
* it's only an optimization anyways */
if (list_empty(&mdev->submit.writes))
break;
spin_lock(&mdev->submit.lock);
list_splice_tail_init(&mdev->submit.writes, &more_incoming);
spin_unlock(&mdev->submit.lock);
if (list_empty(&more_incoming))
break;
made_progress = prepare_al_transaction_nonblock(mdev, &more_incoming, &more_pending);
list_splice_tail_init(&more_pending, &pending);
list_splice_tail_init(&more_incoming, &incoming);
if (!made_progress)
break;
}
drbd_al_begin_io_commit(mdev, false);
list_for_each_entry_safe(req, tmp, &pending, tl_requests) {