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Message-Id: <20190423055420.26408-2-jasowang@redhat.com> Date: Tue, 23 Apr 2019 01:54:15 -0400 From: Jason Wang <jasowang@...hat.com> To: mst@...hat.com, jasowang@...hat.com, kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Cc: peterx@...hat.com, aarcange@...hat.com, James.Bottomley@...senpartnership.com, hch@...radead.org, davem@...emloft.net, jglisse@...hat.com, linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org, linux-parisc@...r.kernel.org, christophe.de.dinechin@...il.com, jrdr.linux@...il.com Subject: [RFC PATCH V3 1/6] vhost: generalize adding used elem Use one generic vhost_copy_to_user() instead of two dedicated accessor. This will simplify the conversion to fine grain accessors. About 2% improvement of PPS were seen during vitio-user txonly test. Signed-off-by: Jason Wang <jasowang@...hat.com> --- drivers/vhost/vhost.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 351af88231ad..6df76ac8200a 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2255,16 +2255,7 @@ static int __vhost_add_used_n(struct vhost_virtqueue *vq, start = vq->last_used_idx & (vq->num - 1); used = vq->used->ring + start; - if (count == 1) { - if (vhost_put_user(vq, heads[0].id, &used->id)) { - vq_err(vq, "Failed to write used id"); - return -EFAULT; - } - if (vhost_put_user(vq, heads[0].len, &used->len)) { - vq_err(vq, "Failed to write used len"); - return -EFAULT; - } - } else if (vhost_copy_to_user(vq, used, heads, count * sizeof *used)) { + if (vhost_copy_to_user(vq, used, heads, count * sizeof *used)) { vq_err(vq, "Failed to write used"); return -EFAULT; } -- 2.18.1
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