Commit 103c2de1 authored by Peter-Jan Gootzen's avatar Peter-Jan Gootzen Committed by Miklos Szeredi
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virtio-fs: limit number of request queues 



Virtio-fs devices might allocate significant resources to virtio queues
such as CPU cores that busy poll on the queue. The device indicates how
many request queues it can support and the driver should initialize the
number of queues that they want to utilize.

In this patch we limit the number of initialized request queues to the
number of CPUs, to limit the resource consumption on the device-side
and to prepare for the upcoming multi-queue patch.

Signed-off-by: default avatarPeter-Jan Gootzen <pgootzen@nvidia.com>
Signed-off-by: default avatarYoray Zack <yorayz@nvidia.com>
Suggested-by: default avatarMax Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: default avatarMax Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
Acked-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent 24601487

fs/fuse/virtio_fs.c

+3 −0
Original line number Diff line number Diff line
@@ -751,6 +751,9 @@ static int virtio_fs_setup_vqs(struct virtio_device *vdev, 
	if (fs->num_request_queues == 0)

		return -EINVAL;



	/* Truncate nr of request queues to nr_cpu_id */

	fs->num_request_queues = min_t(unsigned int, fs->num_request_queues,

					nr_cpu_ids);

	fs->nvqs = VQ_REQUEST + fs->num_request_queues;

	fs->vqs = kcalloc(fs->nvqs, sizeof(fs->vqs[VQ_HIPRIO]), GFP_KERNEL);

	if (!fs->vqs)