From: Jason Wang <jasowang@redhat.com> To: mst@redhat.com, jasowang@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, peterx@redhat.com, James.Bottomley@hansenpartnership.com, hch@infradead.org, davem@davemloft.net, jglisse@redhat.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-parisc@vger.kernel.org, christophe.de.dinechin@gmail.com, jrdr.linux@gmail.com Subject: [PATCH net-next 1/6] vhost: generalize adding used elem Date: Fri, 24 May 2019 04:12:13 -0400 [thread overview] Message-ID: <20190524081218.2502-2-jasowang@redhat.com> (raw) In-Reply-To: <20190524081218.2502-1-jasowang@redhat.com> 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@redhat.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 1e3ed41ae1f3..47fb3a297c29 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
WARNING: multiple messages have this Message-ID (diff)
From: Jason Wang <jasowang@redhat.com> To: mst@redhat.com, jasowang@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Cc: hch@infradead.org, christophe.de.dinechin@gmail.com, linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org, peterx@redhat.com, James.Bottomley@hansenpartnership.com, linux-mm@kvack.org, jglisse@redhat.com, jrdr.linux@gmail.com, davem@davemloft.net, linux-arm-kernel@lists.infradead.org Subject: [PATCH net-next 1/6] vhost: generalize adding used elem Date: Fri, 24 May 2019 04:12:13 -0400 [thread overview] Message-ID: <20190524081218.2502-2-jasowang@redhat.com> (raw) In-Reply-To: <20190524081218.2502-1-jasowang@redhat.com> 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@redhat.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 1e3ed41ae1f3..47fb3a297c29 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-05-24 8:13 UTC|newest] Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-05-24 8:12 [PATCH net-next 0/6] vhost: accelerate metadata access Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` [PATCH net-next 1/6] vhost: generalize adding used elem Jason Wang 2019-05-24 8:12 ` Jason Wang [this message] 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` [PATCH net-next 2/6] vhost: fine grain userspace memory accessors Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` [PATCH net-next 3/6] vhost: rename vq_iotlb_prefetch() to vq_meta_prefetch() Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` [PATCH net-next 4/6] vhost: introduce helpers to get the size of metadata area Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` [PATCH net-next 5/6] vhost: factor out setting vring addr and num Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` [PATCH net-next 6/6] vhost: access vq metadata through kernel virtual address Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-30 18:07 ` [PATCH net-next 0/6] vhost: accelerate metadata access David Miller 2019-05-30 18:07 ` David Miller 2019-05-30 18:07 ` David Miller 2019-05-30 18:13 ` Michael S. Tsirkin 2019-05-30 18:13 ` Michael S. Tsirkin 2019-05-30 18:13 ` Michael S. Tsirkin 2019-05-30 18:55 ` David Miller 2019-05-30 18:55 ` David Miller 2019-05-30 18:55 ` David Miller 2019-06-05 20:27 ` Michael S. Tsirkin 2019-06-05 20:27 ` Michael S. Tsirkin 2019-06-05 20:27 ` Michael S. Tsirkin 2019-06-10 3:50 ` Jason Wang 2019-06-10 3:50 ` Jason Wang 2019-06-10 3:50 ` Jason Wang
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20190524081218.2502-2-jasowang@redhat.com \ --to=jasowang@redhat.com \ --cc=James.Bottomley@hansenpartnership.com \ --cc=christophe.de.dinechin@gmail.com \ --cc=davem@davemloft.net \ --cc=hch@infradead.org \ --cc=jglisse@redhat.com \ --cc=jrdr.linux@gmail.com \ --cc=kvm@vger.kernel.org \ --cc=linux-arm-kernel@lists.infradead.org \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-mm@kvack.org \ --cc=linux-parisc@vger.kernel.org \ --cc=mst@redhat.com \ --cc=netdev@vger.kernel.org \ --cc=peterx@redhat.com \ --cc=virtualization@lists.linux-foundation.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.