search for: virtio_balloon_pfns_limit

On Thu, Jul 28, 2016 at 03:06:37AM +0000, Li, Liang Z wrote: > > > + * 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...

On Thu, Jul 28, 2016 at 03:06:37AM +0000, Li, Liang Z wrote: > > > + * 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...

...b/drivers/virtio/virtio_balloon.c > index 8d649a2..2d18ff6 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -41,10 +41,28 @@ > #define OOM_VBALLOON_DEFAULT_PAGES 256 > #define VIRTBALLOON_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_BALLO...

...b/drivers/virtio/virtio_balloon.c > index 8d649a2..2d18ff6 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -41,10 +41,28 @@ > #define OOM_VBALLOON_DEFAULT_PAGES 256 > #define VIRTBALLOON_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_BALLO...

> > + * 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_lim...

...b/drivers/virtio/virtio_balloon.c > index 8d649a2..2d18ff6 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -41,10 +41,28 @@ > #define OOM_VBALLOON_DEFAULT_PAGES 256 > #define VIRTBALLOON_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_BALLO...

...b/drivers/virtio/virtio_balloon.c > index 8d649a2..2d18ff6 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -41,10 +41,28 @@ > #define OOM_VBALLOON_DEFAULT_PAGES 256 > #define VIRTBALLOON_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_BALLO...

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_len + vb->bmap_len, GFP_KE...

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_len + vb->bmap_len, GFP_KE...

...diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index 8d649a2..2d18ff6 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -41,10 +41,28 @@ #define OOM_VBALLOON_DEFAULT_PAGES 256 #define VIRTBALLOON_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 sys...

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

> 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); > > > + vb->bm...

> 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); > > > + vb->bm...

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%.

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->bmap_hdr = kzalloc(hdr_len...

> 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->bmap_hdr = kzalloc(hdr_len...

...i, 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(struct balloon_bmap_hdr); > &...

On Thu, Jul 28, 2016 at 01:13:35AM +0000, Li, Liang Z wrote: > > 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->bm...