search for: virtio_balloon_chunk_size_shift

...mory Stats virtqueue */ #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */ +#define VIRTIO_BALLOON_F_CHUNK_TRANSFER 3 /* Transfer pages in chunks */ /* Size of a PFN in the balloon interface. */ #define VIRTIO_BALLOON_PFN_SHIFT 12 +/* Shift to get a chunk size */ +#define VIRTIO_BALLOON_CHUNK_SIZE_SHIFT 12 + struct virtio_balloon_config { /* Number of pages host wants Guest to give up. */ __u32 num_pages; @@ -82,4 +86,12 @@ struct virtio_balloon_stat { __virtio64 val; } __attribute__((packed)); +/* Response header structure */ +struct virtio_balloon_resp_hdr { + u8 cmd; + u8 flag; + __le...

...RTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */ > +#define VIRTIO_BALLOON_F_CHUNK_TRANSFER 3 /* Transfer pages in chunks */ > > /* Size of a PFN in the balloon interface. */ > #define VIRTIO_BALLOON_PFN_SHIFT 12 > > +/* Shift to get a chunk size */ > +#define VIRTIO_BALLOON_CHUNK_SIZE_SHIFT 12 > + > struct virtio_balloon_config { > /* Number of pages host wants Guest to give up. */ > __u32 num_pages; > @@ -82,4 +86,12 @@ struct virtio_balloon_stat { > __virtio64 val; > } __attribute__((packed)); > > +/* Response header structure */ > +struct vir...

...RTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */ > +#define VIRTIO_BALLOON_F_CHUNK_TRANSFER 3 /* Transfer pages in chunks */ > > /* Size of a PFN in the balloon interface. */ > #define VIRTIO_BALLOON_PFN_SHIFT 12 > > +/* Shift to get a chunk size */ > +#define VIRTIO_BALLOON_CHUNK_SIZE_SHIFT 12 > + > struct virtio_balloon_config { > /* Number of pages host wants Guest to give up. */ > __u32 num_pages; > @@ -82,4 +86,12 @@ struct virtio_balloon_stat { > __virtio64 val; > } __attribute__((packed)); > > +/* Response header structure */ > +struct vir...

Take over this work from Liang. This patch series implements two optimizations: 1) transfer pages in chuncks between the guest and host; 1) transfer the guest unused pages to the host so that they can be skipped to migrate in live migration. Please check patch 0003 for more details about optimization 1). For an idle guest with 8GB RAM, optimization 2) can help shorten the total live migration

Take over this work from Liang. This patch series implements two optimizations: 1) transfer pages in chuncks between the guest and host; 1) transfer the guest unused pages to the host so that they can be skipped to migrate in live migration. Please check patch 0003 for more details about optimization 1). For an idle guest with 8GB RAM, optimization 2) can help shorten the total live migration

...uffer to an empty queue. */ - virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL); - virtqueue_kick(vq); +static void do_set_resp_bitmap(struct virtio_balloon *vb, unsigned long base, + int size) +{ + /* Use the extented chunk format if the size is too large */ + if (size > (1 << VIRTIO_BALLOON_CHUNK_SIZE_SHIFT)) { + struct balloon_page_chunk_ext *chunk_ext = + (struct balloon_page_chunk_ext *)(vb->resp_data + vb->resp_pos); + chunk_ext->base = cpu_to_le64(base); + chunk_ext->size = cpu_to_le64(size); + vb->resp_pos += sizeof(vb->resp_pos) / sizeof(*chunk_ext); + } else { + struct...

...+ break; + default: + dev_warn(&vb->vdev->dev, "%s: chunk %d of unknown pages\n", + __func__, type); + return; + } + chunk = chunk + hdr->chunks; + chunk->base = cpu_to_le64(base << VIRTIO_BALLOON_CHUNK_BASE_SHIFT); + chunk->size = cpu_to_le64(size << VIRTIO_BALLOON_CHUNK_SIZE_SHIFT); + hdr->chunks++; + if (hdr->chunks == MAX_PAGE_CHUNKS) + send_page_chunks(vb, vq, type, false); +} + +static void chunking_pages_from_bmap(struct virtio_balloon *vb, + struct virtqueue *vq, + unsigned long pfn_start, + unsigned long *bmap, + unsigned long le...

...->balloon_page_chunk; + struct virtio_balloon_page_chunk_entry *entry; + uint64_t chunk_num = le64_to_cpu(chunk->chunk_num); + + entry = &chunk->entry[chunk_num]; + entry->base = cpu_to_le64(base << VIRTIO_BALLOON_CHUNK_BASE_SHIFT); + entry->size = cpu_to_le64(size << VIRTIO_BALLOON_CHUNK_SIZE_SHIFT); + chunk->chunk_num = cpu_to_le64(++chunk_num); + if (chunk_num == VIRTIO_BALLOON_MAX_PAGE_CHUNKS) + send_page_chunks(vb, vq); +} + +static void convert_bmap_to_chunks(struct virtio_balloon *vb, + struct virtqueue *vq, + unsigned long *bmap, + unsigned long pfn_start, +...

...+ struct virtio_balloon_page_chunk_entry *entry; > + uint64_t chunk_num = le64_to_cpu(chunk->chunk_num); > + > + entry = &chunk->entry[chunk_num]; > + entry->base = cpu_to_le64(base << VIRTIO_BALLOON_CHUNK_BASE_SHIFT); > + entry->size = cpu_to_le64(size << VIRTIO_BALLOON_CHUNK_SIZE_SHIFT); > + chunk->chunk_num = cpu_to_le64(++chunk_num); > + if (chunk_num == VIRTIO_BALLOON_MAX_PAGE_CHUNKS) > + send_page_chunks(vb, vq); > +} > + > +static void convert_bmap_to_chunks(struct virtio_balloon *vb, > + struct virtqueue *vq, > + unsigned long *bmap,...

...+ struct virtio_balloon_page_chunk_entry *entry; > + uint64_t chunk_num = le64_to_cpu(chunk->chunk_num); > + > + entry = &chunk->entry[chunk_num]; > + entry->base = cpu_to_le64(base << VIRTIO_BALLOON_CHUNK_BASE_SHIFT); > + entry->size = cpu_to_le64(size << VIRTIO_BALLOON_CHUNK_SIZE_SHIFT); > + chunk->chunk_num = cpu_to_le64(++chunk_num); > + if (chunk_num == VIRTIO_BALLOON_MAX_PAGE_CHUNKS) > + send_page_chunks(vb, vq); > +} > + > +static void convert_bmap_to_chunks(struct virtio_balloon *vb, > + struct virtqueue *vq, > + unsigned long *bmap,...

...virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL); > - virtqueue_kick(vq); > +static void do_set_resp_bitmap(struct virtio_balloon *vb, unsigned long base, > + int size) > +{ > + /* Use the extented chunk format if the size is too large */ > + if (size > (1 << VIRTIO_BALLOON_CHUNK_SIZE_SHIFT)) { > + struct balloon_page_chunk_ext *chunk_ext = > + (struct balloon_page_chunk_ext *)(vb->resp_data + vb->resp_pos); > + chunk_ext->base = cpu_to_le64(base); > + chunk_ext->size = cpu_to_le64(size); > + vb->resp_pos += sizeof(vb->resp_pos) / sizeof(*chunk_e...

...virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL); > - virtqueue_kick(vq); > +static void do_set_resp_bitmap(struct virtio_balloon *vb, unsigned long base, > + int size) > +{ > + /* Use the extented chunk format if the size is too large */ > + if (size > (1 << VIRTIO_BALLOON_CHUNK_SIZE_SHIFT)) { > + struct balloon_page_chunk_ext *chunk_ext = > + (struct balloon_page_chunk_ext *)(vb->resp_data + vb->resp_pos); > + chunk_ext->base = cpu_to_le64(base); > + chunk_ext->size = cpu_to_le64(size); > + vb->resp_pos += sizeof(vb->resp_pos) / sizeof(*chunk_e...

This patch series implements the follow two things: 1) Optimization of balloon page transfer: instead of transferring balloon pages to host one by one, the new mechanism transfers them in chunks. 2) A mechanism to report info of guest unused pages: the pages have been unused at some time between when host sent command and when guest reported them. Host uses that by tracking memory changes and

This patch series implements the follow two things: 1) Optimization of balloon page transfer: instead of transferring balloon pages to host one by one, the new mechanism transfers them in chunks. 2) A mechanism to report info of guest unused pages: the pages have been unused at some time between when host sent command and when guest reported them. Host uses that by tracking memory changes and

...q_vq; + int ret, order; + struct zone *zone = NULL; + bool part_fill = false; + + mutex_lock(&vb->balloon_lock); + + for (order = MAX_ORDER - 1; order >= 0; order--) { + ret = mark_unused_pages(&zone, order, vb->resp_data, + vb->resp_buf_size / sizeof(__le64), + &pos, VIRTIO_BALLOON_CHUNK_SIZE_SHIFT, part_fill); + if (ret == -ENOSPC) { + if (pos == 0) { + void *new_resp_data; + + new_resp_data = kmalloc(2 * vb->resp_buf_size, + GFP_KERNEL); + if (new_resp_data) { + kfree(vb->resp_data); + vb->resp_data = new_resp_data; + vb->resp_buf_size *= 2; + }...

This patch series implements two optimizations: 1) transfer pages in chuncks between the guest and host; 2) transfer the guest unused pages to the host so that they can be skipped to migrate in live migration. Changes: v8->v9: 1) Split the two new features, VIRTIO_BALLOON_F_BALLOON_CHUNKS and VIRTIO_BALLOON_F_MISC_VQ, which were mixed together in the previous implementation; 2) Simpler

This patch series implements two optimizations: 1) transfer pages in chuncks between the guest and host; 2) transfer the guest unused pages to the host so that they can be skipped to migrate in live migration. Changes: v8->v9: 1) Split the two new features, VIRTIO_BALLOON_F_BALLOON_CHUNKS and VIRTIO_BALLOON_F_MISC_VQ, which were mixed together in the previous implementation; 2) Simpler

...&sg, 1, vb, GFP_KERNEL); >> - virtqueue_kick(vq); >> +static void do_set_resp_bitmap(struct virtio_balloon *vb, unsigned long base, >> + int size) >> +{ >> + /* Use the extented chunk format if the size is too large */ >> + if (size > (1 << VIRTIO_BALLOON_CHUNK_SIZE_SHIFT)) { >> + struct balloon_page_chunk_ext *chunk_ext = >> + (struct balloon_page_chunk_ext *)(vb->resp_data + vb->resp_pos); >> + chunk_ext->base = cpu_to_le64(base); >> + chunk_ext->size = cpu_to_le64(size); >> + vb->resp_pos += sizeof(vb->resp_po...

...arn(&vb->vdev->dev, "%s: chunk %d of unknown pages\n", > + __func__, type); > + return; > + } > + chunk = chunk + hdr->chunks; > + chunk->base = cpu_to_le64(base << VIRTIO_BALLOON_CHUNK_BASE_SHIFT); > + chunk->size = cpu_to_le64(size << VIRTIO_BALLOON_CHUNK_SIZE_SHIFT); > + hdr->chunks++; Isn't this LE? You should keep it somewhere else. > + if (hdr->chunks == MAX_PAGE_CHUNKS) > + send_page_chunks(vb, vq, type, false); and zero chunks here? > +} > + > +static void chunking_pages_from_bmap(struct virtio_balloon *vb, Does this mea...

...arn(&vb->vdev->dev, "%s: chunk %d of unknown pages\n", > + __func__, type); > + return; > + } > + chunk = chunk + hdr->chunks; > + chunk->base = cpu_to_le64(base << VIRTIO_BALLOON_CHUNK_BASE_SHIFT); > + chunk->size = cpu_to_le64(size << VIRTIO_BALLOON_CHUNK_SIZE_SHIFT); > + hdr->chunks++; Isn't this LE? You should keep it somewhere else. > + if (hdr->chunks == MAX_PAGE_CHUNKS) > + send_page_chunks(vb, vq, type, false); and zero chunks here? > +} > + > +static void chunking_pages_from_bmap(struct virtio_balloon *vb, Does this mea...