search for: max_page_chunks

...s 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. > > So just combine the...

...s 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. > > So just combine the...

...to free on OOM"); > static struct vfsmount *balloon_mnt; > #endif > > +/* Types of pages to chunk */ > +#define PAGE_CHUNK_TYPE_BALLOON 0 > + Doesn't look like you are ever adding more types in this patchset. Pls keep code simple, generalize it later. > +#define MAX_PAGE_CHUNKS 4096 This is an order-4 allocation. I'd make it 4095 and then it's an order-3 one. > struct virtio_balloon { > struct virtio_device *vdev; > struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; > @@ -78,6 +86,32 @@ struct virtio_balloon { > /* Synchronize access/upd...

...to free on OOM"); > static struct vfsmount *balloon_mnt; > #endif > > +/* Types of pages to chunk */ > +#define PAGE_CHUNK_TYPE_BALLOON 0 > + Doesn't look like you are ever adding more types in this patchset. Pls keep code simple, generalize it later. > +#define MAX_PAGE_CHUNKS 4096 This is an order-4 allocation. I'd make it 4095 and then it's an order-3 one. > struct virtio_balloon { > struct virtio_device *vdev; > struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; > @@ -78,6 +86,32 @@ struct virtio_balloon { > /* Synchronize access/upd...

...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 MAX_PAGE_CHUNKS 4096 > This is an order-4 alloca...

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

...virtio/virtio_balloon.c index 5e2e7cc..95c703e 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -56,11 +56,12 @@ static struct vfsmount *balloon_mnt; /* Types of pages to chunk */ #define PAGE_CHUNK_TYPE_BALLOON 0 +#define PAGE_CHUNK_TYPE_UNUSED 1 #define MAX_PAGE_CHUNKS 4096 struct virtio_balloon { struct virtio_device *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;...

...e 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -56,11 +56,12 @@ static struct vfsmount *balloon_mnt; > > /* Types of pages to chunk */ > #define PAGE_CHUNK_TYPE_BALLOON 0 > +#define PAGE_CHUNK_TYPE_UNUSED 1 > > #define MAX_PAGE_CHUNKS 4096 > struct virtio_balloon { > struct virtio_device *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...

...e 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -56,11 +56,12 @@ static struct vfsmount *balloon_mnt; > > /* Types of pages to chunk */ > #define PAGE_CHUNK_TYPE_BALLOON 0 > +#define PAGE_CHUNK_TYPE_UNUSED 1 > > #define MAX_PAGE_CHUNKS 4096 > struct virtio_balloon { > struct virtio_device *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...

...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. &g...

...es, int, S_IRUSR | S_IWUSR); MODULE_PARM_DESC(oom_pages, "pages to free on OOM"); @@ -50,6 +54,10 @@ MODULE_PARM_DESC(oom_pages, "pages to free on OOM"); static struct vfsmount *balloon_mnt; #endif +/* Types of pages to chunk */ +#define PAGE_CHUNK_TYPE_BALLOON 0 + +#define MAX_PAGE_CHUNKS 4096 struct virtio_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...

...rent 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...

...rent 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...