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    Subject[RFC 3/5] vhost_test: batch used buffer
    Date
    Only add to used ring when a batch a buffer have all been used.  And if
    in order feature negotiated, add randomness to the used buffer's order,
    test the ability of vhost to reorder batched buffer.

    Signed-off-by: Guo Zhi <qtxuning1999@sjtu.edu.cn>
    ---
    drivers/vhost/test.c | 15 ++++++++++++++-
    1 file changed, 14 insertions(+), 1 deletion(-)

    diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c
    index bc8e7fb1e..1c9c40c11 100644
    --- a/drivers/vhost/test.c
    +++ b/drivers/vhost/test.c
    @@ -43,6 +43,9 @@ struct vhost_test {
    static void handle_vq(struct vhost_test *n)
    {
    struct vhost_virtqueue *vq = &n->vqs[VHOST_TEST_VQ];
    + struct vring_used_elem *heads = kmalloc(sizeof(*heads)
    + * vq->num, GFP_KERNEL);
    + int batch_idx = 0;
    unsigned out, in;
    int head;
    size_t len, total_len = 0;
    @@ -84,11 +87,21 @@ static void handle_vq(struct vhost_test *n)
    vq_err(vq, "Unexpected 0 len for TX\n");
    break;
    }
    - vhost_add_used_and_signal(&n->dev, vq, head, 0);
    + heads[batch_idx].id = cpu_to_vhost32(vq, head);
    + heads[batch_idx++].len = cpu_to_vhost32(vq, len);
    total_len += len;
    if (unlikely(vhost_exceeds_weight(vq, 0, total_len)))
    break;
    }
    + if (batch_idx) {
    + if (vhost_has_feature(vq, VIRTIO_F_IN_ORDER) && batch_idx >= 2) {
    + vhost_add_used_and_signal_n(&n->dev, vq, &heads[batch_idx / 2],
    + batch_idx - batch_idx / 2);
    + vhost_add_used_and_signal_n(&n->dev, vq, heads, batch_idx / 2);
    + } else {
    + vhost_add_used_and_signal_n(&n->dev, vq, heads, batch_idx);
    + }
    + }

    mutex_unlock(&vq->mutex);
    }
    --
    2.17.1
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