search for: 16c2cb6

...; > + } > + return 0; > +} > +EXPORT_SYMBOL_GPL(vhost_add_used_idx); > + > static int __vhost_add_used_n(struct vhost_virtqueue *vq, > struct vring_used_elem *heads, > unsigned count) > diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h > index 16c2cb6..5dd6c05 100644 > --- a/drivers/vhost/vhost.h > +++ b/drivers/vhost/vhost.h > @@ -199,6 +199,7 @@ int __vhost_get_vq_desc(struct vhost_virtqueue *vq, > void vhost_discard_vq_desc(struct vhost_virtqueue *, int n); > > int vhost_vq_init_access(struct vhost_virtqueue *); > +in...

...; > + } > + return 0; > +} > +EXPORT_SYMBOL_GPL(vhost_add_used_idx); > + > static int __vhost_add_used_n(struct vhost_virtqueue *vq, > struct vring_used_elem *heads, > unsigned count) > diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h > index 16c2cb6..5dd6c05 100644 > --- a/drivers/vhost/vhost.h > +++ b/drivers/vhost/vhost.h > @@ -199,6 +199,7 @@ int __vhost_get_vq_desc(struct vhost_virtqueue *vq, > void vhost_discard_vq_desc(struct vhost_virtqueue *, int n); > > int vhost_vq_init_access(struct vhost_virtqueue *); > +in...

...9;s designed to be used in a specific way to make it necessary - but what is it? > + return ret; > +} > +EXPORT_SYMBOL(vhost_prefetch_desc_indices); > > static int __init vhost_init(void) > { > diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h > index 39ff897..16c2cb6 100644 > --- a/drivers/vhost/vhost.h > +++ b/drivers/vhost/vhost.h > @@ -228,6 +228,9 @@ ssize_t vhost_chr_read_iter(struct vhost_dev *dev, struct iov_iter *to, > ssize_t vhost_chr_write_iter(struct vhost_dev *dev, > struct iov_iter *from); > int vhost_init_device_iotlb...

...9;s designed to be used in a specific way to make it necessary - but what is it? > + return ret; > +} > +EXPORT_SYMBOL(vhost_prefetch_desc_indices); > > static int __init vhost_init(void) > { > diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h > index 39ff897..16c2cb6 100644 > --- a/drivers/vhost/vhost.h > +++ b/drivers/vhost/vhost.h > @@ -228,6 +228,9 @@ ssize_t vhost_chr_read_iter(struct vhost_dev *dev, struct iov_iter *to, > ssize_t vhost_chr_write_iter(struct vhost_dev *dev, > struct iov_iter *from); > int vhost_init_device_iotlb...

...st_add_used_idx); > > > + > > > static int __vhost_add_used_n(struct vhost_virtqueue *vq, > > > struct vring_used_elem *heads, > > > unsigned count) > > > diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h > > > index 16c2cb6..5dd6c05 100644 > > > --- a/drivers/vhost/vhost.h > > > +++ b/drivers/vhost/vhost.h > > > @@ -199,6 +199,7 @@ int __vhost_get_vq_desc(struct vhost_virtqueue *vq, > > > void vhost_discard_vq_desc(struct vhost_virtqueue *, int n); > > > int vhost_vq_in...

...st_add_used_idx); > > > + > > > static int __vhost_add_used_n(struct vhost_virtqueue *vq, > > > struct vring_used_elem *heads, > > > unsigned count) > > > diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h > > > index 16c2cb6..5dd6c05 100644 > > > --- a/drivers/vhost/vhost.h > > > +++ b/drivers/vhost/vhost.h > > > @@ -199,6 +199,7 @@ int __vhost_get_vq_desc(struct vhost_virtqueue *vq, > > > void vhost_discard_vq_desc(struct vhost_virtqueue *, int n); > > > int vhost_vq_in...

...>log_ctx) + eventfd_signal(vq->log_ctx, 1); + } + return 0; +} +EXPORT_SYMBOL_GPL(vhost_add_used_idx); + static int __vhost_add_used_n(struct vhost_virtqueue *vq, struct vring_used_elem *heads, unsigned count) diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 16c2cb6..5dd6c05 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -199,6 +199,7 @@ int __vhost_get_vq_desc(struct vhost_virtqueue *vq, void vhost_discard_vq_desc(struct vhost_virtqueue *, int n); int vhost_vq_init_access(struct vhost_virtqueue *); +int vhost_add_used_idx(struct vhost_v...

...; +} >> +EXPORT_SYMBOL_GPL(vhost_add_used_idx); >> + >> static int __vhost_add_used_n(struct vhost_virtqueue *vq, >> struct vring_used_elem *heads, >> unsigned count) >> diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h >> index 16c2cb6..5dd6c05 100644 >> --- a/drivers/vhost/vhost.h >> +++ b/drivers/vhost/vhost.h >> @@ -199,6 +199,7 @@ int __vhost_get_vq_desc(struct vhost_virtqueue *vq, >> void vhost_discard_vq_desc(struct vhost_virtqueue *, int n); >> >> int vhost_vq_init_access(struct v...

...idx = 0; + total -= copied; + } + + /* Only get avail ring entries after they have been exposed by guest. */ + smp_rmb(); + return ret; +} +EXPORT_SYMBOL(vhost_prefetch_desc_indices); static int __init vhost_init(void) { diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 39ff897..16c2cb6 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -228,6 +228,9 @@ ssize_t vhost_chr_read_iter(struct vhost_dev *dev, struct iov_iter *to, ssize_t vhost_chr_write_iter(struct vhost_dev *dev, struct iov_iter *from); int vhost_init_device_iotlb(struct vhost_dev *d, bool ena...

...his after reading avail_idx. Thanks > > >> + return ret; >> +} >> +EXPORT_SYMBOL(vhost_prefetch_desc_indices); >> >> static int __init vhost_init(void) >> { >> diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h >> index 39ff897..16c2cb6 100644 >> --- a/drivers/vhost/vhost.h >> +++ b/drivers/vhost/vhost.h >> @@ -228,6 +228,9 @@ ssize_t vhost_chr_read_iter(struct vhost_dev *dev, struct iov_iter *to, >> ssize_t vhost_chr_write_iter(struct vhost_dev *dev, >> struct iov_iter *from); >>...

...> > > > > > + return ret; > > > +} > > > +EXPORT_SYMBOL(vhost_prefetch_desc_indices); > > > static int __init vhost_init(void) > > > { > > > diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h > > > index 39ff897..16c2cb6 100644 > > > --- a/drivers/vhost/vhost.h > > > +++ b/drivers/vhost/vhost.h > > > @@ -228,6 +228,9 @@ ssize_t vhost_chr_read_iter(struct vhost_dev *dev, struct iov_iter *to, > > > ssize_t vhost_chr_write_iter(struct vhost_dev *dev, > > > struc...

...> > > > > > + return ret; > > > +} > > > +EXPORT_SYMBOL(vhost_prefetch_desc_indices); > > > static int __init vhost_init(void) > > > { > > > diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h > > > index 39ff897..16c2cb6 100644 > > > --- a/drivers/vhost/vhost.h > > > +++ b/drivers/vhost/vhost.h > > > @@ -228,6 +228,9 @@ ssize_t vhost_chr_read_iter(struct vhost_dev *dev, struct iov_iter *to, > > > ssize_t vhost_chr_write_iter(struct vhost_dev *dev, > > > struc...

Hi: This series tries to implement basic tx batched processing. This is done by prefetching descriptor indices and update used ring in a batch. This intends to speed up used ring updating and improve the cache utilization. Test shows about ~22% improvement in tx pss. Please review. Jason Wang (5): vhost: split out ring head fetching logic vhost: introduce helper to prefetch desc index

Hi: This series tries to implement basic tx batched processing. This is done by prefetching descriptor indices and update used ring in a batch. This intends to speed up used ring updating and improve the cache utilization. Test shows about ~22% improvement in tx pss. Please review. Jason Wang (5): vhost: split out ring head fetching logic vhost: introduce helper to prefetch desc index