search for: update_free_pages_stats

...q_hdr req_hdr; > /* > * The pages we've told the Host we're not using are enqueued > * at vb_dev_info->pages list. > @@ -373,6 +378,49 @@ static void update_balloon_stats(struct virtio_balloon *vb) > pages_to_bytes(available)); > } > > +static void update_free_pages_stats(struct virtio_balloon *vb, why _stats? > + unsigned long req_id) > +{ > + struct scatterlist sg_in, sg_out; > + unsigned long pfn = 0, bmap_len, max_pfn; > + struct virtqueue *vq = vb->misc_vq; > + struct balloon_bmap_hdr *hdr = vb->bmap_hdr; > + int ret = 1; > +...

...q_hdr req_hdr; > /* > * The pages we've told the Host we're not using are enqueued > * at vb_dev_info->pages list. > @@ -373,6 +378,49 @@ static void update_balloon_stats(struct virtio_balloon *vb) > pages_to_bytes(available)); > } > > +static void update_free_pages_stats(struct virtio_balloon *vb, why _stats? > + unsigned long req_id) > +{ > + struct scatterlist sg_in, sg_out; > + unsigned long pfn = 0, bmap_len, max_pfn; > + struct virtqueue *vq = vb->misc_vq; > + struct balloon_bmap_hdr *hdr = vb->bmap_hdr; > + int ret = 1; > +...

.../* Request header */ + struct balloon_req_hdr req_hdr; /* * The pages we've told the Host we're not using are enqueued * at vb_dev_info->pages list. @@ -373,6 +378,49 @@ static void update_balloon_stats(struct virtio_balloon *vb) pages_to_bytes(available)); } +static void update_free_pages_stats(struct virtio_balloon *vb, + unsigned long req_id) +{ + struct scatterlist sg_in, sg_out; + unsigned long pfn = 0, bmap_len, max_pfn; + struct virtqueue *vq = vb->misc_vq; + struct balloon_bmap_hdr *hdr = vb->bmap_hdr; + int ret = 1; + + max_pfn = get_max_pfn(); + mutex_lock(&vb->ba...

The current QEMU live migration implementation mark the all the guest's RAM pages as dirtied in the ram bulk stage, all these pages will be processed and that takes quit a lot of CPU cycles. >From guest's point of view, it doesn't care about the content in free pages. We can make use of this fact and skip processing the free pages in the ram bulk stage, it can save a lot CPU cycles

The current QEMU live migration implementation mark the all the guest's RAM pages as dirtied in the ram bulk stage, all these pages will be processed and that takes quit a lot of CPU cycles. >From guest's point of view, it doesn't care about the content in free pages. We can make use of this fact and skip processing the free pages in the ram bulk stage, it can save a lot CPU cycles

> > } > > > > +static void update_free_pages_stats(struct virtio_balloon *vb, > > why _stats? Will change. > > + max_pfn = get_max_pfn(); > > + mutex_lock(&vb->balloon_lock); > > + while (pfn < max_pfn) { > > + memset(vb->page_bitmap, 0, vb->bmap_len); > > + ret = get_free_pages(pfn, pfn + vb...

This patchset is for kernel and contains two parts of change to the virtio-balloon. One is the change for speeding up the inflating & deflating process, the main idea of this optimization is to use bitmap to send the page information to host instead of the PFNs, to reduce the overhead of virtio data transmission, address translation and madvise(). This can help to improve the performance by

This patchset is for kernel and contains two parts of change to the virtio-balloon. One is the change for speeding up the inflating & deflating process, the main idea of this optimization is to use bitmap to send the page information to host instead of the PFNs, to reduce the overhead of virtio data transmission, address translation and madvise(). This can help to improve the performance by

This patch set contains two parts of changes to the virtio-balloon. One is the change for speeding up the inflating & deflating process, the main idea of this optimization is to use bitmap to send the page information to host instead of the PFNs, to reduce the overhead of virtio data transmission, address translation and madvise(). This can help to improve the performance by about 85%.

This patch set contains two parts of changes to the virtio-balloon. One is the change for speeding up the inflating & deflating process, the main idea of this optimization is to use bitmap to send the page information to host instead of the PFNs, to reduce the overhead of virtio data transmission, address translation and madvise(). This can help to improve the performance by about 85%.