search for: max_pfn

...machine */ +static unsigned long max_mfn; + +/* virtual starting address of the hypervisor */ +static unsigned long hvirt_start; + +/* #levels of page tables used by the currrent guest */ +static unsigned int pt_levels; + +/* total number of pages used by the current guest */ +static unsigned long max_pfn; + +/* A table mapping each PFN to its new MFN. */ +static xen_pfn_t *p2m = NULL; + +static ssize_t +read_exact(int fd, void *buf, size_t count) +{ + int r = 0, s; + unsigned char *b = buf; + + while (r < count) { + s = read(fd, &b[r], count - r); + if ((s == -1) &...

...t; index 2d18ff6..5ca4ad3 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -62,10 +62,13 @@ module_param(oom_pages, int, S_IRUSR | S_IWUSR); > MODULE_PARM_DESC(oom_pages, "pages to free on OOM"); > > extern unsigned long get_max_pfn(void); > +extern int get_free_pages(unsigned long start_pfn, unsigned long end_pfn, > + unsigned long *bitmap, unsigned long len); > + > > struct virtio_balloon { > struct virtio_device *vdev; > - struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; > + struct virtque...

...t; index 2d18ff6..5ca4ad3 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -62,10 +62,13 @@ module_param(oom_pages, int, S_IRUSR | S_IWUSR); > MODULE_PARM_DESC(oom_pages, "pages to free on OOM"); > > extern unsigned long get_max_pfn(void); > +extern int get_free_pages(unsigned long start_pfn, unsigned long end_pfn, > + unsigned long *bitmap, unsigned long len); > + > > struct virtio_balloon { > struct virtio_device *vdev; > - struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; > + struct virtque...

...<= 0) + if (credits_left <= 0) break; if (entry->type != E820_RAM) continue; - e_pfn = PFN_UP(entry->addr + entry->size); + e_pfn = PFN_DOWN(entry->addr + entry->size); /* We only care about E820 after the xen_start_info->nr_pages */ if (e_pfn <= max_pfn) continue; - s_pfn = PFN_DOWN(entry->addr); + s_pfn = PFN_UP(entry->addr); /* If the E820 falls within the nr_pages, we want to start * at the nr_pages PFN. * If that would mean going past the E820 entry, skip it */ +again: if (s_pfn <= max_pfn) { capacity = e...

...<= 0) + if (credits_left <= 0) break; if (entry->type != E820_RAM) continue; - e_pfn = PFN_UP(entry->addr + entry->size); + e_pfn = PFN_DOWN(entry->addr + entry->size); /* We only care about E820 after the xen_start_info->nr_pages */ if (e_pfn <= max_pfn) continue; - s_pfn = PFN_DOWN(entry->addr); + s_pfn = PFN_UP(entry->addr); /* If the E820 falls within the nr_pages, we want to start * at the nr_pages PFN. * If that would mean going past the E820 entry, skip it */ +again: if (s_pfn <= max_pfn) { capacity = e...

The following dump-core patches changes its format into ELF, adds PFN-GMFN table, HVM support, and adds experimental IA64 support. - ELF format Program header and note section are adopted. - HVM domain support To know the memory area to dump, XENMEM_set_memory_map is added. XENMEM_memory_map hypercall is for current domain, so new one is created. and hvm domain builder tell xen its

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

make balloon driver not return pages which are in [xen_start_info->nr_pages, max_pfn] on ia64. On ia64 memory might be assigned sparsely. In that case xen_start_info->nr_pages and max_pfn doesn''t match while pages which are in [xen_start_info->nr_pages, max_pfn] are used. -- yamahata _______________________________________________ Xen-devel mailing list Xen-devel...

.../drivers/virtio/virtio_balloon.c index 2d18ff6..5ca4ad3 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -62,10 +62,13 @@ module_param(oom_pages, int, S_IRUSR | S_IWUSR); MODULE_PARM_DESC(oom_pages, "pages to free on OOM"); extern unsigned long get_max_pfn(void); +extern int get_free_pages(unsigned long start_pfn, unsigned long end_pfn, + unsigned long *bitmap, unsigned long len); + struct virtio_balloon { struct virtio_device *vdev; - struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq,...

...f (user_pgd != NULL) { user_pgd[pgd_index(VSYSCALL_START)] = - __pgd(__pa(level3_user_vsyscall) | _PAGE_TABLE); + __pgd(__pa_symbol(level3_user_vsyscall) | + _PAGE_TABLE); ret = 0; } @@ -1958,10 +1959,10 @@ void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn) * pgd. */ if (xen_feature(XENFEAT_writable_page_tables)) { - native_write_cr3(__pa(init_level4_pgt)); + native_write_cr3(__pa_symbol(init_level4_pgt)); } else { xen_mc_batch(); - __xen_write_cr3(true, __pa(init_level4_pgt)); + __xen_write_cr3(true, __pa_symbol(init_level4_pgt));...

...f (user_pgd != NULL) { user_pgd[pgd_index(VSYSCALL_START)] = - __pgd(__pa(level3_user_vsyscall) | _PAGE_TABLE); + __pgd(__pa_symbol(level3_user_vsyscall) | + _PAGE_TABLE); ret = 0; } @@ -1958,10 +1959,10 @@ void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn) * pgd. */ if (xen_feature(XENFEAT_writable_page_tables)) { - native_write_cr3(__pa(init_level4_pgt)); + native_write_cr3(__pa_symbol(init_level4_pgt)); } else { xen_mc_batch(); - __xen_write_cr3(true, __pa(init_level4_pgt)); + __xen_write_cr3(true, __pa_symbol(init_level4_pgt));...

...IO_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...

...IO_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...

...IFY_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 cover most case...

> > } > > > > +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->pfn_limit, > > + vb->page_bitmap, vb->bmap_len * BITS_PER_BYTE); &...

...c/xc_linux_restore.c Sun Apr 16 15:41:31 2006 +0100 +++ b/tools/libxc/xc_linux_restore.c Mon Apr 17 15:47:29 2006 -0500 @@ -183,9 +183,9 @@ int xc_linux_restore(int xc_handle, int /* We want zeroed memory so use calloc rather than malloc. */ - p2m = calloc(sizeof(unsigned long), max_pfn); - pfn_type = calloc(sizeof(unsigned long), max_pfn); - region_mfn = calloc(sizeof(unsigned long), MAX_BATCH_SIZE); + p2m = calloc(max_pfn, sizeof(unsigned long)); + pfn_type = calloc(max_pfn, sizeof(unsigned long)); + region_mfn = calloc(MAX_BATCH_SIZE, sizeof(unsigned l...

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%.

.../* Pointer of the bitmap header. */ > + void *bmap_hdr; > + /* Bitmap and bitmap count used to tell the host the pages */ > + unsigned long *page_bitmap[BALLOON_BMAP_COUNT]; > + unsigned int nr_page_bmap; > + /* Used to record the processed pfn range */ > + unsigned long min_pfn, max_pfn, start_pfn, end_pfn; > /* > * The pages we've told the Host we're not using are enqueued > * at vb_dev_info->pages list. > @@ -110,16 +121,66 @@ static void balloon_ack(struct virtqueue *vq) > wake_up(&vb->acked); > } > > +static inline void in...