search for: pfn_limit

On 07/26/2016 06:23 PM, Liang Li wrote: > + vb->pfn_limit = VIRTIO_BALLOON_PFNS_LIMIT; > + vb->pfn_limit = min(vb->pfn_limit, get_max_pfn()); > + vb->bmap_len = ALIGN(vb->pfn_limit, BITS_PER_LONG) / > + BITS_PER_BYTE + 2 * sizeof(unsigned long); > + hdr_len = sizeof(struct balloon_bmap_hdr); > + vb->bmap_hdr = kzalloc(hdr_l...

On 07/26/2016 06:23 PM, Liang Li wrote: > + vb->pfn_limit = VIRTIO_BALLOON_PFNS_LIMIT; > + vb->pfn_limit = min(vb->pfn_limit, get_max_pfn()); > + vb->bmap_len = ALIGN(vb->pfn_limit, BITS_PER_LONG) / > + BITS_PER_BYTE + 2 * sizeof(unsigned long); > + hdr_len = sizeof(struct balloon_bmap_hdr); > + vb->bmap_hdr = kzalloc(hdr_l...

> Subject: Re: [PATCH v2 repost 4/7] virtio-balloon: speed up inflate/deflate > process > > On Wed, Jul 27, 2016 at 09:03:21AM -0700, Dave Hansen wrote: > > On 07/26/2016 06:23 PM, Liang Li wrote: > > > + vb->pfn_limit = VIRTIO_BALLOON_PFNS_LIMIT; > > > + vb->pfn_limit = min(vb->pfn_limit, get_max_pfn()); > > > + vb->bmap_len = ALIGN(vb->pfn_limit, BITS_PER_LONG) / > > > + BITS_PER_BYTE + 2 * sizeof(unsigned long); > > > + hdr_len = sizeof(struct balloon_bmap_hdr)...

> Subject: Re: [PATCH v2 repost 4/7] virtio-balloon: speed up inflate/deflate > process > > On Wed, Jul 27, 2016 at 09:03:21AM -0700, Dave Hansen wrote: > > On 07/26/2016 06:23 PM, Liang Li wrote: > > > + vb->pfn_limit = VIRTIO_BALLOON_PFNS_LIMIT; > > > + vb->pfn_limit = min(vb->pfn_limit, get_max_pfn()); > > > + vb->bmap_len = ALIGN(vb->pfn_limit, BITS_PER_LONG) / > > > + BITS_PER_BYTE + 2 * sizeof(unsigned long); > > > + hdr_len = sizeof(struct balloon_bmap_hdr)...

.../* > + * VIRTIO_BALLOON_PFNS_LIMIT is used to limit the size of page bitmap > + * to prevent a very large page bitmap, there are two reasons for this: > + * 1) to save memory. > + * 2) allocate a large bitmap may fail. > + * > + * The actual limit of pfn is determined by: > + * pfn_limit = min(max_pfn, VIRTIO_BALLOON_PFNS_LIMIT); > + * > + * If system has more pages than VIRTIO_BALLOON_PFNS_LIMIT, we will scan > + * the page list and send the PFNs with several times. To reduce the > + * overhead of scanning the page list. VIRTIO_BALLOON_PFNS_LIMIT should > + * be set...

.../* > + * VIRTIO_BALLOON_PFNS_LIMIT is used to limit the size of page bitmap > + * to prevent a very large page bitmap, there are two reasons for this: > + * 1) to save memory. > + * 2) allocate a large bitmap may fail. > + * > + * The actual limit of pfn is determined by: > + * pfn_limit = min(max_pfn, VIRTIO_BALLOON_PFNS_LIMIT); > + * > + * If system has more pages than VIRTIO_BALLOON_PFNS_LIMIT, we will scan > + * the page list and send the PFNs with several times. To reduce the > + * overhead of scanning the page list. VIRTIO_BALLOON_PFNS_LIMIT should > + * be set...

...q, *deflate_vq, *stats_vq; > + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq, *misc_vq; > > /* The balloon servicing is delegated to a freezable workqueue. */ > struct work_struct update_balloon_stats_work; > @@ -89,6 +92,8 @@ struct virtio_balloon { > unsigned long pfn_limit; > /* Used to record the processed pfn range */ > unsigned long min_pfn, max_pfn, start_pfn, end_pfn; > + /* 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->page...

...q, *deflate_vq, *stats_vq; > + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq, *misc_vq; > > /* The balloon servicing is delegated to a freezable workqueue. */ > struct work_struct update_balloon_stats_work; > @@ -89,6 +92,8 @@ struct virtio_balloon { > unsigned long pfn_limit; > /* Used to record the processed pfn range */ > unsigned long min_pfn, max_pfn, start_pfn, end_pfn; > + /* 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->page...

...S_LIMIT is used to limit the size of page bitmap > > + * to prevent a very large page bitmap, there are two reasons for this: > > + * 1) to save memory. > > + * 2) allocate a large bitmap may fail. > > + * > > + * The actual limit of pfn is determined by: > > + * pfn_limit = min(max_pfn, VIRTIO_BALLOON_PFNS_LIMIT); > > + * > > + * If system has more pages than VIRTIO_BALLOON_PFNS_LIMIT, we will > > +scan > > + * the page list and send the PFNs with several times. To reduce the > > + * overhead of scanning the page list. VIRTIO_BALLOON_PF...

...ize of page bitmap > > > + * to prevent a very large page bitmap, there are two reasons for this: > > > + * 1) to save memory. > > > + * 2) allocate a large bitmap may fail. > > > + * > > > + * The actual limit of pfn is determined by: > > > + * pfn_limit = min(max_pfn, VIRTIO_BALLOON_PFNS_LIMIT); > > > + * > > > + * If system has more pages than VIRTIO_BALLOON_PFNS_LIMIT, we will > > > +scan > > > + * the page list and send the PFNs with several times. To reduce the > > > + * overhead of scanning the pag...

...ize of page bitmap > > > + * to prevent a very large page bitmap, there are two reasons for this: > > > + * 1) to save memory. > > > + * 2) allocate a large bitmap may fail. > > > + * > > > + * The actual limit of pfn is determined by: > > > + * pfn_limit = min(max_pfn, VIRTIO_BALLOON_PFNS_LIMIT); > > > + * > > > + * If system has more pages than VIRTIO_BALLOON_PFNS_LIMIT, we will > > > +scan > > > + * the page list and send the PFNs with several times. To reduce the > > > + * overhead of scanning the pag...

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

.../* > + * VIRTIO_BALLOON_PFNS_LIMIT is used to limit the size of page bitmap > + * to prevent a very large page bitmap, there are two reasons for this: > + * 1) to save memory. > + * 2) allocate a large bitmap may fail. > + * > + * The actual limit of pfn is determined by: > + * pfn_limit = min(max_pfn, VIRTIO_BALLOON_PFNS_LIMIT); > + * > + * If system has more pages than VIRTIO_BALLOON_PFNS_LIMIT, we will scan > + * the page list and send the PFNs with several times. To reduce the > + * overhead of scanning the page list. VIRTIO_BALLOON_PFNS_LIMIT should > + * be set...

.../* > + * VIRTIO_BALLOON_PFNS_LIMIT is used to limit the size of page bitmap > + * to prevent a very large page bitmap, there are two reasons for this: > + * 1) to save memory. > + * 2) allocate a large bitmap may fail. > + * > + * The actual limit of pfn is determined by: > + * pfn_limit = min(max_pfn, VIRTIO_BALLOON_PFNS_LIMIT); > + * > + * If system has more pages than VIRTIO_BALLOON_PFNS_LIMIT, we will scan > + * the page list and send the PFNs with several times. To reduce the > + * overhead of scanning the page list. VIRTIO_BALLOON_PFNS_LIMIT should > + * be set...

...TBALLOON_OOM_NOTIFY_PRIORITY 80 +/* + * VIRTIO_BALLOON_PFNS_LIMIT is used to limit the size of page bitmap + * to prevent a very large page bitmap, there are two reasons for this: + * 1) to save memory. + * 2) allocate a large bitmap may fail. + * + * The actual limit of pfn is determined by: + * pfn_limit = min(max_pfn, VIRTIO_BALLOON_PFNS_LIMIT); + * + * If system has more pages than VIRTIO_BALLOON_PFNS_LIMIT, we will scan + * the page list and send the PFNs with several times. To reduce the + * overhead of scanning the page list. VIRTIO_BALLOON_PFNS_LIMIT should + * be set with a value which can c...

On Wed, Jul 27, 2016 at 09:03:21AM -0700, Dave Hansen wrote: > On 07/26/2016 06:23 PM, Liang Li wrote: > > + vb->pfn_limit = VIRTIO_BALLOON_PFNS_LIMIT; > > + vb->pfn_limit = min(vb->pfn_limit, get_max_pfn()); > > + vb->bmap_len = ALIGN(vb->pfn_limit, BITS_PER_LONG) / > > + BITS_PER_BYTE + 2 * sizeof(unsigned long); > > + hdr_len = sizeof(struct balloon_bmap_hdr); > > + vb-&gt...

> Subject: Re: [PATCH v2 repost 4/7] virtio-balloon: speed up inflate/deflate > process > > On 07/26/2016 06:23 PM, Liang Li wrote: > > + vb->pfn_limit = VIRTIO_BALLOON_PFNS_LIMIT; > > + vb->pfn_limit = min(vb->pfn_limit, get_max_pfn()); > > + vb->bmap_len = ALIGN(vb->pfn_limit, BITS_PER_LONG) / > > + BITS_PER_BYTE + 2 * sizeof(unsigned long); > > + hdr_len = sizeof(struct balloon_bmap_hdr); > > + vb-&gt...

...ct 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->pfn_limit, > > + vb->page_bitmap, vb->bmap_len * BITS_PER_BYTE); > > + hdr->cmd = cpu_to_virtio16(vb->vdev, > BALLOON_GET_FREE_PAGES); > > + hdr->page_shift = cpu_to_virtio16(vb->vdev, PAGE_SHIFT); > > + hdr->req_id = cpu_to_virtio64(vb->vdev, req_id);...

...9AM +0000, Li, Liang Z wrote: > > Subject: Re: [PATCH v2 repost 4/7] virtio-balloon: speed up inflate/deflate > > process > > > > On Wed, Jul 27, 2016 at 09:03:21AM -0700, Dave Hansen wrote: > > > On 07/26/2016 06:23 PM, Liang Li wrote: > > > > + vb->pfn_limit = VIRTIO_BALLOON_PFNS_LIMIT; > > > > + vb->pfn_limit = min(vb->pfn_limit, get_max_pfn()); > > > > + vb->bmap_len = ALIGN(vb->pfn_limit, BITS_PER_LONG) / > > > > + BITS_PER_BYTE + 2 * sizeof(unsigned long); > > > > + hdr_len = sizeof(stru...