search for: page_bmap

..._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 page_bmap */ >> + unsigned int page_bmaps; >> + >> + /* >> + * The allocated page_bmap size may be smaller than the pfn range of >> + * the ballooned pages. In this case, we need to use the page_bmap >&gt...

...oon.c b/drivers/virtio/virtio_balloon.c > index f59cb4f..5e2e7cc 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -42,6 +42,10 @@ > #define OOM_VBALLOON_DEFAULT_PAGES 256 > #define VIRTBALLOON_OOM_NOTIFY_PRIORITY 80 > > +#define PAGE_BMAP_SIZE (8 * PAGE_SIZE) > +#define PFNS_PER_PAGE_BMAP (PAGE_BMAP_SIZE * BITS_PER_BYTE) > +#define PAGE_BMAP_COUNT_MAX 32 > + Please prefix with VIRTIO_BALLOON_ and add comments. > static int oom_pages = OOM_VBALLOON_DEFAULT_PAGES; > module_param(oom_pages, int, S_IRUSR | S_IWUSR);...

...oon.c b/drivers/virtio/virtio_balloon.c > index f59cb4f..5e2e7cc 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -42,6 +42,10 @@ > #define OOM_VBALLOON_DEFAULT_PAGES 256 > #define VIRTBALLOON_OOM_NOTIFY_PRIORITY 80 > > +#define PAGE_BMAP_SIZE (8 * PAGE_SIZE) > +#define PFNS_PER_PAGE_BMAP (PAGE_BMAP_SIZE * BITS_PER_BYTE) > +#define PAGE_BMAP_COUNT_MAX 32 > + Please prefix with VIRTIO_BALLOON_ and add comments. > static int oom_pages = OOM_VBALLOON_DEFAULT_PAGES; > module_param(oom_pages, int, S_IRUSR | S_IWUSR);...

...diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index f59cb4f..5e2e7cc 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -42,6 +42,10 @@ #define OOM_VBALLOON_DEFAULT_PAGES 256 #define VIRTBALLOON_OOM_NOTIFY_PRIORITY 80 +#define PAGE_BMAP_SIZE (8 * PAGE_SIZE) +#define PFNS_PER_PAGE_BMAP (PAGE_BMAP_SIZE * BITS_PER_BYTE) +#define PAGE_BMAP_COUNT_MAX 32 + static int oom_pages = OOM_VBALLOON_DEFAULT_PAGES; module_param(oom_pages, int, S_IRUSR | S_IWUSR); MODULE_PARM_DESC(oom_pages, "pages to free on OOM"); @@ -50,6 +54,10...

...diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index f59cb4f..3f4a161 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -42,6 +42,10 @@ #define OOM_VBALLOON_DEFAULT_PAGES 256 #define VIRTBALLOON_OOM_NOTIFY_PRIORITY 80 +#define PAGE_BMAP_SIZE (8 * PAGE_SIZE) +#define PFNS_PER_PAGE_BMAP (PAGE_BMAP_SIZE * BITS_PER_BYTE) +#define PAGE_BMAP_COUNT_MAX 32 + static int oom_pages = OOM_VBALLOON_DEFAULT_PAGES; module_param(oom_pages, int, S_IRUSR | S_IWUSR); MODULE_PARM_DESC(oom_pages, "pages to free on OOM"); @@ -50,6 +54,14 @...

...a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index ecb64e9..df16912 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -43,6 +43,20 @@ #define OOM_VBALLOON_DEFAULT_PAGES 256 #define VIRTBALLOON_OOM_NOTIFY_PRIORITY 80 +/* The size of one page_bmap used to record inflated/deflated pages. */ +#define VIRTIO_BALLOON_PAGE_BMAP_SIZE (8 * PAGE_SIZE) +/* + * Callulates how many pfns can a page_bmap record. A bit corresponds to a + * page of PAGE_SIZE. + */ +#define VIRTIO_BALLOON_PFNS_PER_PAGE_BMAP \ + (VIRTIO_BALLOON_PAGE_BMAP_SIZE * BITS_PER_BYTE...

...vers/virtio/virtio_balloon.c > index ecb64e9..df16912 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -43,6 +43,20 @@ > #define OOM_VBALLOON_DEFAULT_PAGES 256 > #define VIRTBALLOON_OOM_NOTIFY_PRIORITY 80 > > +/* The size of one page_bmap used to record inflated/deflated pages. */ > +#define VIRTIO_BALLOON_PAGE_BMAP_SIZE (8 * PAGE_SIZE) > +/* > + * Callulates how many pfns can a page_bmap record. A bit corresponds to a > + * page of PAGE_SIZE. > + */ > +#define VIRTIO_BALLOON_PFNS_PER_PAGE_BMAP \ > + (VIRTIO_BAL...

...vers/virtio/virtio_balloon.c > index ecb64e9..df16912 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -43,6 +43,20 @@ > #define OOM_VBALLOON_DEFAULT_PAGES 256 > #define VIRTBALLOON_OOM_NOTIFY_PRIORITY 80 > > +/* The size of one page_bmap used to record inflated/deflated pages. */ > +#define VIRTIO_BALLOON_PAGE_BMAP_SIZE (8 * PAGE_SIZE) > +/* > + * Callulates how many pfns can a page_bmap record. A bit corresponds to a > + * page of PAGE_SIZE. > + */ > +#define VIRTIO_BALLOON_PFNS_PER_PAGE_BMAP \ > + (VIRTIO_BAL...

...balloon.c b/drivers/virtio/virtio_balloon.c index ecb64e9..0cf945c 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -51,6 +51,36 @@ MODULE_PARM_DESC(oom_pages, "pages to free on OOM"); static struct vfsmount *balloon_mnt; #endif +/* The size of one page_bmap used to record inflated/deflated pages. */ +#define VIRTIO_BALLOON_PAGE_BMAP_SIZE (8 * PAGE_SIZE) +/* + * Callulates how many pfns can a page_bmap record. A bit corresponds to a + * page of PAGE_SIZE. + */ +#define VIRTIO_BALLOON_PFNS_PER_PAGE_BMAP \ + (VIRTIO_BALLOON_PAGE_BMAP_SIZE * BITS_PER_BYTE...

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

...n.c > index ecb64e9..0cf945c 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -51,6 +51,36 @@ MODULE_PARM_DESC(oom_pages, "pages to free on OOM"); > static struct vfsmount *balloon_mnt; > #endif > > +/* The size of one page_bmap used to record inflated/deflated pages. */ > +#define VIRTIO_BALLOON_PAGE_BMAP_SIZE (8 * PAGE_SIZE) At this size, you probably want alloc_pages to avoid kmalloc overhead. > +/* > + * Callulates how many pfns can a page_bmap record. A bit corresponds to a > + * page of PAGE_SIZE. >...

...n.c > index ecb64e9..0cf945c 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -51,6 +51,36 @@ MODULE_PARM_DESC(oom_pages, "pages to free on OOM"); > static struct vfsmount *balloon_mnt; > #endif > > +/* The size of one page_bmap used to record inflated/deflated pages. */ > +#define VIRTIO_BALLOON_PAGE_BMAP_SIZE (8 * PAGE_SIZE) At this size, you probably want alloc_pages to avoid kmalloc overhead. > +/* > + * Callulates how many pfns can a page_bmap record. A bit corresponds to a > + * page of PAGE_SIZE. >...

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

This patch series enhances the existing virtio-balloon with the following new features: 1) fast ballooning: transfer ballooned pages between the guest and host in chunks, instead of one by one; and 2) cmdq: a new virtqueue to send commands between the device and driver. Currently, it supports commands to report memory stats (replace the old statq mechanism) and report guest unused pages. Liang Li

This patch series enhances the existing virtio-balloon with the following new features: 1) fast ballooning: transfer ballooned pages between the guest and host in chunks, instead of one by one; and 2) cmdq: a new virtqueue to send commands between the device and driver. Currently, it supports commands to report memory stats (replace the old statq mechanism) and report guest unused pages. Liang Li

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. Please read each patch commit log for details. Changes: v7->v8: 1) Use only one chunk format, instead of two. 2) re-write the virtio-balloon implementation patch. 3) commit changes 4)

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. Please read each patch commit log for details. Changes: v7->v8: 1) Use only one chunk format, instead of two. 2) re-write the virtio-balloon implementation patch. 3) commit changes 4)

...on.c >> index f59cb4f..4416370 100644 >> --- a/drivers/virtio/virtio_balloon.c >> +++ b/drivers/virtio/virtio_balloon.c >> @@ -42,6 +42,10 @@ >> #define OOM_VBALLOON_DEFAULT_PAGES 256 >> #define VIRTBALLOON_OOM_NOTIFY_PRIORITY 80 >> >> +#define PAGE_BMAP_SIZE (8 * PAGE_SIZE) >> +#define PFNS_PER_PAGE_BMAP (PAGE_BMAP_SIZE * BITS_PER_BYTE) >> +#define PAGE_BMAP_COUNT_MAX 32 >> + >> static int oom_pages = OOM_VBALLOON_DEFAULT_PAGES; >> module_param(oom_pages, int, S_IRUSR | S_IWUSR); >> MODULE_PARM_DESC(oom_pa...