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nvme_disk: Queue requests if there are already requests queued.

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This way, we don't do I/O out-of-order within a qpair under
heavy load conditions.
This commit is contained in:
Augustin Cavalier
2020-04-20 23:53:12 -04:00
parent fdfb71a406
commit 21b312b61e
1 changed files with 7 additions and 3 deletions
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src/add-ons/kernel/drivers/disk/nvme/libnvme/nvme_qpair.c
+7 -3
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@@ -1037,10 +1037,11 @@ int nvme_qpair_submit_request(struct nvme_qpair *qpair,
pthread_mutex_lock(&qpair->lock); pthread_mutex_lock(&qpair->lock);
tr = LIST_FIRST(&qpair->free_tr); tr = LIST_FIRST(&qpair->free_tr);
if (tr == NULL || !qpair->enabled) { if (tr == NULL || !qpair->enabled || !STAILQ_EMPTY(&qpair->queued_req)) {
/* /*
* No tracker is available, or the qpair is disabled due * No tracker is available, the qpair is disabled due
* to an in-progress controller-level reset. * to an in-progress controller-level reset, or
* there are already queued requests.
* *
* Put the request on the qpair's request queue to be * Put the request on the qpair's request queue to be
* processed when a tracker frees up via a command * processed when a tracker frees up via a command
@@ -1048,6 +1049,9 @@ int nvme_qpair_submit_request(struct nvme_qpair *qpair,
*/ */
STAILQ_INSERT_TAIL(&qpair->queued_req, req, stailq); STAILQ_INSERT_TAIL(&qpair->queued_req, req, stailq);
pthread_mutex_unlock(&qpair->lock); pthread_mutex_unlock(&qpair->lock);
if (tr)
nvme_qpair_submit_queued_requests(qpair);
return 0; return 0;
} }