diff mbox series

[v3,13/15] virtio: blk/scsi: use block layer helpers to calculate num of queues

Message ID 20240806-isolcpus-io-queues-v3-13-da0eecfeaf8b@suse.de
State New
Headers show
Series honor isolcpus configuration | expand

Commit Message

Daniel Wagner Aug. 6, 2024, 12:06 p.m. UTC 
Multiqueue devices should only allocate queues for the housekeeping CPUs
when isolcpus=io_queue is set. This avoids that the isolated CPUs get
disturbed with OS workload.

Use helpers which calculates the correct number of queues which should
be used when isolcpus is used.

Signed-off-by: Daniel Wagner <dwagner@suse.de>
---
 drivers/block/virtio_blk.c | 5 ++---
 drivers/scsi/virtio_scsi.c | 1 +
 2 files changed, 3 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 8f68037da00b..3584a1e00791 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -982,9 +982,8 @@  static int init_vq(struct virtio_blk *vblk)
 		return -EINVAL;
 	}
 
-	num_vqs = min_t(unsigned int,
-			min_not_zero(num_request_queues, nr_cpu_ids),
-			num_vqs);
+	num_vqs = blk_mq_num_possible_queues(
+			min_not_zero(num_request_queues, num_vqs));
 
 	num_poll_vqs = min_t(unsigned int, poll_queues, num_vqs - 1);
 
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 8013a082598b..1c1feec59781 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -921,6 +921,7 @@  static int virtscsi_probe(struct virtio_device *vdev)
 	/* We need to know how many queues before we allocate. */
 	num_queues = virtscsi_config_get(vdev, num_queues) ? : 1;
 	num_queues = min_t(unsigned int, nr_cpu_ids, num_queues);
+	num_queues = blk_mq_num_possible_queues(num_queues);
 
 	num_targets = virtscsi_config_get(vdev, max_target) + 1;