From: Jens Axboe <axboe@fb.com>
To: <axboe@kernel.dk>, <linux-block@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Cc: <paolo.valente@linaro.org>, Jens Axboe <axboe@fb.com>
Subject: [PATCH 5/7] blk-mq: add BLK_MQ_F_NO_SCHED flag
Date: Mon, 5 Dec 2016 11:27:04 -0700 [thread overview]
Message-ID: <1480962426-15767-6-git-send-email-axboe@fb.com> (raw)
In-Reply-To: <1480962426-15767-1-git-send-email-axboe@fb.com>
Drivers can use this to prevent IO scheduling on a queue. Use this
for NVMe, for the admin queue, which doesn't handle file system
requests.
Signed-off-by: Jens Axboe <axboe@fb.com>
---
drivers/nvme/host/pci.c | 1 +
include/linux/blk-mq.h | 1 +
2 files changed, 2 insertions(+)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index d58f8e4e2c06..4560575f0a39 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1187,6 +1187,7 @@ static int nvme_alloc_admin_tags(struct nvme_dev *dev)
dev->admin_tagset.timeout = ADMIN_TIMEOUT;
dev->admin_tagset.numa_node = dev_to_node(dev->dev);
dev->admin_tagset.cmd_size = nvme_cmd_size(dev);
+ dev->admin_tagset.flags = BLK_MQ_F_NO_SCHED;
dev->admin_tagset.driver_data = dev;
if (blk_mq_alloc_tag_set(&dev->admin_tagset))
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 35a0af5ede6d..a85bd83bb218 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -151,6 +151,7 @@ enum {
BLK_MQ_F_SG_MERGE = 1 << 2,
BLK_MQ_F_DEFER_ISSUE = 1 << 4,
BLK_MQ_F_BLOCKING = 1 << 5,
+ BLK_MQ_F_NO_SCHED = 1 << 6,
BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
BLK_MQ_F_ALLOC_POLICY_BITS = 1,
--
2.7.4
next prev parent reply other threads:[~2016-12-05 18:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-05 18:26 [PATCHSET/RFC v2] Make legacy IO schedulers work with blk-mq Jens Axboe
2016-12-05 18:27 ` [PATCH 1/7] block: use legacy path for flush requests for MQ with a scheduler Jens Axboe
2016-12-05 18:27 ` [PATCH 2/7] cfq-iosched: use appropriate run queue function Jens Axboe
2016-12-05 18:27 ` [PATCH 3/7] block: use appropriate queue running functions Jens Axboe
2016-12-05 18:27 ` [PATCH 4/7] blk-mq: blk_account_io_start() takes a bool Jens Axboe
2016-12-05 18:27 ` Jens Axboe [this message]
2016-12-05 18:27 ` [PATCH 6/7] blk-mq: test patch to get legacy IO schedulers working Jens Axboe
2016-12-05 18:27 ` [PATCH 7/7] block: drop irq+lock when flushing queue plugs Jens Axboe
2016-12-06 10:01 ` [PATCHSET/RFC v2] Make legacy IO schedulers work with blk-mq Paolo Valente
2016-12-06 15:29 ` Jens Axboe
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