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virtio-blk: add num_request_queues module parameter 

Sometimes a user would like to control the amount of request queues to
be created for a block device. For example, for limiting the memory
footprint of virtio-blk devices.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Link: https://lore.kernel.org/r/20210902204622.54354-1-mgurtovoy@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Max Gurtovoy 2021-09-02 23:46:22 +03:00 committed by Michael S. Tsirkin
parent 02746e26c3
commit 0989c41bed
1 changed files with 22 additions and 1 deletions
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23
drivers/block/virtio_blk.c
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@ -30,6 +30,25 @@
#define VIRTIO_BLK_INLINE_SG_CNT 2
#endif
static int virtblk_queue_count_set(const char *val,
const struct kernel_param *kp)
{
return param_set_uint_minmax(val, kp, 1, nr_cpu_ids);
}
static const struct kernel_param_ops queue_count_ops = {
.set = virtblk_queue_count_set,
.get = param_get_uint,
};
static unsigned int num_request_queues;
module_param_cb(num_request_queues, &queue_count_ops, &num_request_queues,
0644);
MODULE_PARM_DESC(num_request_queues,
"Limit the number of request queues to use for blk device. "
"0 for no limit. "
"Values > nr_cpu_ids truncated to nr_cpu_ids.");
static int major;
static DEFINE_IDA(vd_index_ida);
@ -553,7 +572,9 @@ static int init_vq(struct virtio_blk *vblk)
if (err)
num_vqs = 1;
num_vqs = min_t(unsigned int, nr_cpu_ids, num_vqs);
num_vqs = min_t(unsigned int,
min_not_zero(num_request_queues, nr_cpu_ids),
num_vqs);
vblk->vqs = kmalloc_array(num_vqs, sizeof(*vblk->vqs), GFP_KERNEL);
if (!vblk->vqs)