diff options
| author | Sagi Grimberg <sagi@grimberg.me> | 2018-11-02 20:28:15 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-12-08 08:26:55 +0300 |
| commit | 6e3ca03ee934572d5de4fb2224c01e12c4d422c8 (patch) | |
| tree | b6e8dc7fa480aefbd87f68712e651e3cda747078 /drivers/nvme/host/core.c | |
| parent | 3e53ba38a9404434a8b57683825279f4305b5a76 (diff) | |
| download | linux-6e3ca03ee934572d5de4fb2224c01e12c4d422c8.tar.xz | |
nvme: support traffic based keep-alive
If the controller supports traffic based keep alive, we restart the keep
alive timer if any admin or io commands was completed during the kato
period. This prevents a possible starvation of keep alive commands in
the presence of heavy traffic as in such case, we already have a health
indication from the host perspective.
Only set a comp_seen indicator in case the controller supports keep
alive to minimize the overhead for pci controllers.
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/nvme/host/core.c')
| -rw-r--r-- | drivers/nvme/host/core.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 9de6244a345c..48ffb1d685c2 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -251,6 +251,9 @@ void nvme_complete_rq(struct request *req) trace_nvme_complete_rq(req); + if (nvme_req(req)->ctrl->kas) + nvme_req(req)->ctrl->comp_seen = true; + if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) { if ((req->cmd_flags & REQ_NVME_MPATH) && blk_path_error(status)) { @@ -839,6 +842,7 @@ static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status) return; } + ctrl->comp_seen = false; schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); } @@ -863,6 +867,15 @@ static void nvme_keep_alive_work(struct work_struct *work) { struct nvme_ctrl *ctrl = container_of(to_delayed_work(work), struct nvme_ctrl, ka_work); + bool comp_seen = ctrl->comp_seen; + + if ((ctrl->ctratt & NVME_CTRL_ATTR_TBKAS) && comp_seen) { + dev_dbg(ctrl->device, + "reschedule traffic based keep-alive timer\n"); + ctrl->comp_seen = false; + schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ); + return; + } if (nvme_keep_alive(ctrl)) { /* allocation failure, reset the controller */ |