search for: virtio_balloon_page_chunk

...bit address and 32 bit > size. > > If size < 4g is not a significant limitation, why not just use that to pass > address/size in a standard s/g list, possibly using INDIRECT? OK, I see your point, thanks. Post the two options here for an analysis: Option1 (what we have now): struct virtio_balloon_page_chunk { __le64 chunk_num; struct virtio_balloon_page_chunk_entry entry[]; }; Option2: struct virtio_balloon_page_chunk { __le64 chunk_num; struct scatterlist entry[]; }; I don't have an issue to change it to Option2, but I would prefer Option1, because I think there i...

...bit address and 32 bit > size. > > If size < 4g is not a significant limitation, why not just use that to pass > address/size in a standard s/g list, possibly using INDIRECT? OK, I see your point, thanks. Post the two options here for an analysis: Option1 (what we have now): struct virtio_balloon_page_chunk { __le64 chunk_num; struct virtio_balloon_page_chunk_entry entry[]; }; Option2: struct virtio_balloon_page_chunk { __le64 chunk_num; struct scatterlist entry[]; }; I don't have an issue to change it to Option2, but I would prefer Option1, because I think there i...

...e *vdev; - struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq, *miscq; /* The balloon servicing is delegated to a freezable workqueue. */ struct work_struct update_balloon_stats_work; @@ -94,6 +95,19 @@ struct virtio_balloon { struct virtio_balloon_page_chunk_hdr *balloon_page_chunk_hdr; struct virtio_balloon_page_chunk *balloon_page_chunk; + /* + * Buffer for PAGE_CHUNK_TYPE_UNUSED: + * virtio_balloon_miscq_hdr + + * virtio_balloon_page_chunk_hdr + + * virtio_balloon_page_chunk * MAX_PAGE_CHUNKS + */ + struct virtio_balloon_miscq_hdr *miscq_ou...

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

...t; Types of page to chunk are treated differently. Different types of page > chunks are sent to the host via different protocols. > > 1) PAGE_CHUNK_TYPE_BALLOON: Ballooned (i.e. inflated/deflated) pages > to chunk. For the ballooned type, it uses the basic chunk msg format: > > virtio_balloon_page_chunk_hdr + > virtio_balloon_page_chunk * MAX_PAGE_CHUNKS > > 2) PAGE_CHUNK_TYPE_UNUSED: unused pages to chunk. It uses this miscq msg > format: > miscq_hdr + > virtio_balloon_page_chunk_hdr + > virtio_balloon_page_chunk * MAX_PAGE_CHUNKS > > The chunk msg is actually the pay...

...t; Types of page to chunk are treated differently. Different types of page > chunks are sent to the host via different protocols. > > 1) PAGE_CHUNK_TYPE_BALLOON: Ballooned (i.e. inflated/deflated) pages > to chunk. For the ballooned type, it uses the basic chunk msg format: > > virtio_balloon_page_chunk_hdr + > virtio_balloon_page_chunk * MAX_PAGE_CHUNKS > > 2) PAGE_CHUNK_TYPE_UNUSED: unused pages to chunk. It uses this miscq msg > format: > miscq_hdr + > virtio_balloon_page_chunk_hdr + > virtio_balloon_page_chunk * MAX_PAGE_CHUNKS > > The chunk msg is actually the pay...

...vdev; > struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; > @@ -78,6 +86,32 @@ struct virtio_balloon { > /* Synchronize access/update to this struct virtio_balloon elements */ > struct mutex balloon_lock; > > + /* > + * Buffer for PAGE_CHUNK_TYPE_BALLOON: > + * virtio_balloon_page_chunk_hdr + > + * virtio_balloon_page_chunk * MAX_PAGE_CHUNKS > + */ > + struct virtio_balloon_page_chunk_hdr *balloon_page_chunk_hdr; > + struct virtio_balloon_page_chunk *balloon_page_chunk; > + > + /* Bitmap used to record pages */ > + unsigned long *page_bmap[PAGE_BMAP_COUNT_MA...

...vdev; > struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; > @@ -78,6 +86,32 @@ struct virtio_balloon { > /* Synchronize access/update to this struct virtio_balloon elements */ > struct mutex balloon_lock; > > + /* > + * Buffer for PAGE_CHUNK_TYPE_BALLOON: > + * virtio_balloon_page_chunk_hdr + > + * virtio_balloon_page_chunk * MAX_PAGE_CHUNKS > + */ > + struct virtio_balloon_page_chunk_hdr *balloon_page_chunk_hdr; > + struct virtio_balloon_page_chunk *balloon_page_chunk; > + > + /* Bitmap used to record pages */ > + unsigned long *page_bmap[PAGE_BMAP_COUNT_MA...

...uot; is added in another patch. Types of page to chunk are treated differently. Different types of page chunks are sent to the host via different protocols. 1) PAGE_CHUNK_TYPE_BALLOON: Ballooned (i.e. inflated/deflated) pages to chunk. For the ballooned type, it uses the basic chunk msg format: virtio_balloon_page_chunk_hdr + virtio_balloon_page_chunk * MAX_PAGE_CHUNKS 2) PAGE_CHUNK_TYPE_UNUSED: unused pages to chunk. It uses this miscq msg format: miscq_hdr + virtio_balloon_page_chunk_hdr + virtio_balloon_page_chunk * MAX_PAGE_CHUNKS The chunk msg is actually the payload of the miscq msg. >> +#define M...

...irtio_balloon { struct virtio_device *vdev; struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; @@ -78,6 +86,32 @@ struct virtio_balloon { /* Synchronize access/update to this struct virtio_balloon elements */ struct mutex balloon_lock; + /* + * Buffer for PAGE_CHUNK_TYPE_BALLOON: + * virtio_balloon_page_chunk_hdr + + * virtio_balloon_page_chunk * MAX_PAGE_CHUNKS + */ + struct virtio_balloon_page_chunk_hdr *balloon_page_chunk_hdr; + struct virtio_balloon_page_chunk *balloon_page_chunk; + + /* Bitmap used to record pages */ + unsigned long *page_bmap[PAGE_BMAP_COUNT_MAX]; + /* Number of the allocated pa...

...unk are treated differently. Different types of page >> chunks are sent to the host via different protocols. >> >> 1) PAGE_CHUNK_TYPE_BALLOON: Ballooned (i.e. inflated/deflated) pages >> to chunk. For the ballooned type, it uses the basic chunk msg format: >> >> virtio_balloon_page_chunk_hdr + >> virtio_balloon_page_chunk * MAX_PAGE_CHUNKS >> >> 2) PAGE_CHUNK_TYPE_UNUSED: unused pages to chunk. It uses this miscq msg >> format: >> miscq_hdr + >> virtio_balloon_page_chunk_hdr + >> virtio_balloon_page_chunk * MAX_PAGE_CHUNKS >> >>...

...nflate_vq, *deflate_vq, *stats_vq; > + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq, *miscq; > > /* The balloon servicing is delegated to a freezable workqueue. */ > struct work_struct update_balloon_stats_work; > @@ -94,6 +95,19 @@ struct virtio_balloon { > struct virtio_balloon_page_chunk_hdr *balloon_page_chunk_hdr; > struct virtio_balloon_page_chunk *balloon_page_chunk; > > + /* > + * Buffer for PAGE_CHUNK_TYPE_UNUSED: > + * virtio_balloon_miscq_hdr + > + * virtio_balloon_page_chunk_hdr + > + * virtio_balloon_page_chunk * MAX_PAGE_CHUNKS > + */ &gt...

...nflate_vq, *deflate_vq, *stats_vq; > + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq, *miscq; > > /* The balloon servicing is delegated to a freezable workqueue. */ > struct work_struct update_balloon_stats_work; > @@ -94,6 +95,19 @@ struct virtio_balloon { > struct virtio_balloon_page_chunk_hdr *balloon_page_chunk_hdr; > struct virtio_balloon_page_chunk *balloon_page_chunk; > > + /* > + * Buffer for PAGE_CHUNK_TYPE_UNUSED: > + * virtio_balloon_miscq_hdr + > + * virtio_balloon_page_chunk_hdr + > + * virtio_balloon_page_chunk * MAX_PAGE_CHUNKS > + */ &gt...

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

...ifferent types of > >> page chunks are sent to the host via different protocols. > >> > >> 1) PAGE_CHUNK_TYPE_BALLOON: Ballooned (i.e. inflated/deflated) pages > >> to chunk. For the ballooned type, it uses the basic chunk msg format: > >> > >> virtio_balloon_page_chunk_hdr + > >> virtio_balloon_page_chunk * MAX_PAGE_CHUNKS > >> > >> 2) PAGE_CHUNK_TYPE_UNUSED: unused pages to chunk. It uses this miscq > >> msg > >> format: > >> miscq_hdr + > >> virtio_balloon_page_chunk_hdr + > >> virtio_ballo...

...ifferent types of > >> page chunks are sent to the host via different protocols. > >> > >> 1) PAGE_CHUNK_TYPE_BALLOON: Ballooned (i.e. inflated/deflated) pages > >> to chunk. For the ballooned type, it uses the basic chunk msg format: > >> > >> virtio_balloon_page_chunk_hdr + > >> virtio_balloon_page_chunk * MAX_PAGE_CHUNKS > >> > >> 2) PAGE_CHUNK_TYPE_UNUSED: unused pages to chunk. It uses this miscq > >> msg > >> format: > >> miscq_hdr + > >> virtio_balloon_page_chunk_hdr + > >> virtio_ballo...

...gt; > > > If size < 4g is not a significant limitation, why not just use that to pass > > address/size in a standard s/g list, possibly using INDIRECT? > > OK, I see your point, thanks. Post the two options here for an analysis: > Option1 (what we have now): > struct virtio_balloon_page_chunk { > __le64 chunk_num; > struct virtio_balloon_page_chunk_entry entry[]; > }; > Option2: > struct virtio_balloon_page_chunk { > __le64 chunk_num; > struct scatterlist entry[]; > }; This isn't what I meant really :) I meant vring_desc. &gt...

...ARM_DESC(oom_pages, "pages to free on OOM"); @@ -51,6 +65,11 @@ MODULE_PARM_DESC(oom_pages, "pages to free on OOM"); static struct vfsmount *balloon_mnt; #endif +/* Maximum number of page chunks */ +#define VIRTIO_BALLOON_MAX_PAGE_CHUNKS ((8 * PAGE_SIZE - \ + sizeof(struct virtio_balloon_page_chunk)) / \ + sizeof(struct virtio_balloon_page_chunk_entry)) + struct virtio_balloon { struct virtio_device *vdev; struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; @@ -79,6 +98,12 @@ struct virtio_balloon { /* Synchronize access/update to this struct virtio_balloon elements */ struct mut...