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virtio-fs: limit number of request queues

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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: Peter-Jan Gootzen <pgootzen@nvidia.com>
Signed-off-by: Yoray Zack <yorayz@nvidia.com>
Suggested-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Peter-Jan Gootzen 2024-05-01 17:38:16 +02:00 committed by Miklos Szeredi
parent 246014876d
commit 103c2de111
1 changed files with 3 additions and 0 deletions
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3
fs/fuse/virtio_fs.c
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@ -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)