search for: part_fil

...(pos > 0 || done) + send_resp_data(vb, vq, true); + +} + +static void send_unused_pages(struct virtio_balloon *vb, + unsigned long req_id) +{ + struct scatterlist sg_in; + unsigned int pos = 0; + struct virtqueue *vq = vb->host_req_vq; + int ret, order; + struct zone *zone = NULL; + bool part_fill = false; + + mutex_lock(&vb->balloon_lock); + + for (order = MAX_ORDER - 1; order >= 0; order--) { + ret = mark_unused_pages(&zone, order, vb->resp_data, + vb->resp_buf_size / sizeof(__le64), + &pos, VIRTIO_BALLOON_CHUNK_SIZE_SHIFT, part_fill); + if (ret == -ENOSPC)...

...ree_area_init_node(int nid, unsigned long * zones_size, unsigned long zone_start_pfn, unsigned long *zholes_size); extern void free_initmem(void); +extern int record_unused_pages(struct zone **start_zone, int order, + __le64 *pages, unsigned int size, + unsigned int *pos, bool part_fill); /* * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index f3e0c69..b72a7ac 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4498,6 +4498,120 @@ void show_free_areas(unsigned int filter) show_swap_cache_info();...

...loc.c > +++ b/mm/page_alloc.c > @@ -4498,6 +4498,120 @@ void show_free_areas(unsigned int filter) > show_swap_cache_info(); > } > > +static int __record_unused_pages(struct zone *zone, int order, > + __le64 *buf, unsigned int size, > + unsigned int *offset, bool part_fill) > +{ > + unsigned long pfn, flags; > + int t, ret = 0; > + struct list_head *curr; > + __le64 *chunk; > + > + if (zone_is_empty(zone)) > + return 0; > + > + spin_lock_irqsave(&zone->lock, flags); > + > + if (*offset + zone->free_area[order].nr_free &...

...loc.c > +++ b/mm/page_alloc.c > @@ -4498,6 +4498,120 @@ void show_free_areas(unsigned int filter) > show_swap_cache_info(); > } > > +static int __record_unused_pages(struct zone *zone, int order, > + __le64 *buf, unsigned int size, > + unsigned int *offset, bool part_fill) > +{ > + unsigned long pfn, flags; > + int t, ret = 0; > + struct list_head *curr; > + __le64 *chunk; > + > + if (zone_is_empty(zone)) > + return 0; > + > + spin_lock_irqsave(&zone->lock, flags); > + > + if (*offset + zone->free_area[order].nr_free &...

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)

...8,6 +4498,120 @@ void show_free_areas(unsigned int filter) > > > show_swap_cache_info(); > > > } > > > +static int __record_unused_pages(struct zone *zone, int order, > > > + __le64 *buf, unsigned int size, > > > + unsigned int *offset, bool part_fill) > > > +{ > > > + unsigned long pfn, flags; > > > + int t, ret = 0; > > > + struct list_head *curr; > > > + __le64 *chunk; > > > + > > > + if (zone_is_empty(zone)) > > > + return 0; > > > + > > > + spin_lock...

...8,6 +4498,120 @@ void show_free_areas(unsigned int filter) > > > show_swap_cache_info(); > > > } > > > +static int __record_unused_pages(struct zone *zone, int order, > > > + __le64 *buf, unsigned int size, > > > + unsigned int *offset, bool part_fill) > > > +{ > > > + unsigned long pfn, flags; > > > + int t, ret = 0; > > > + struct list_head *curr; > > > + __le64 *chunk; > > > + > > > + if (zone_is_empty(zone)) > > > + return 0; > > > + > > > + spin_lock...

...> 0 || done) + send_resp_data(vb, vq, true); + +} + +static void send_unused_pages(struct virtio_balloon *vb, + unsigned long req_id) +{ + struct scatterlist sg_in; + unsigned int pos = 0; + struct virtqueue *vq = vb->host_req_vq; + int ret, order; + struct zone *zone = NULL; + bool part_fill = false; + + mutex_lock(&vb->balloon_lock); + + for (order = MAX_ORDER - 1; order >= 0; order--) { + ret = record_unused_pages(&zone, order, vb->resp_data, + vb->resp_buf_size / sizeof(__le64), + &pos, part_fill); + if (ret == -ENOSPC) { + if (pos == 0) { +...

...c >> @@ -4498,6 +4498,120 @@ void show_free_areas(unsigned int filter) >> show_swap_cache_info(); >> } >> >> +static int __record_unused_pages(struct zone *zone, int order, >> + __le64 *buf, unsigned int size, >> + unsigned int *offset, bool part_fill) >> +{ >> + unsigned long pfn, flags; >> + int t, ret = 0; >> + struct list_head *curr; >> + __le64 *chunk; >> + >> + if (zone_is_empty(zone)) >> + return 0; >> + >> + spin_lock_irqsave(&zone->lock, flags); >> + >> + i...

...0 @@ void show_free_areas(unsigned int filter) >>>> show_swap_cache_info(); >>>> } >>>> +static int __record_unused_pages(struct zone *zone, int order, >>>> + __le64 *buf, unsigned int size, >>>> + unsigned int *offset, bool part_fill) >>>> +{ >>>> + unsigned long pfn, flags; >>>> + int t, ret = 0; >>>> + struct list_head *curr; >>>> + __le64 *chunk; >>>> + >>>> + if (zone_is_empty(zone)) >>>> + return 0; >>>> + >>...

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 {pfn|length} to present the page information 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 {pfn|length} to present the page information 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%.

Take over this work from Liang. This patch series implements two optimizations: 1) transfer pages in chuncks between the guest and host; 1) transfer the guest unused pages to the host so that they can be skipped to migrate in live migration. Please check patch 0003 for more details about optimization 1). For an idle guest with 8GB RAM, optimization 2) can help shorten the total live migration

Take over this work from Liang. This patch series implements two optimizations: 1) transfer pages in chuncks between the guest and host; 1) transfer the guest unused pages to the host so that they can be skipped to migrate in live migration. Please check patch 0003 for more details about optimization 1). For an idle guest with 8GB RAM, optimization 2) can help shorten the total live migration