search for: page_order

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This patch series restores the use of superpages when restoring or migrating a VM, while retaining efficient batching of 4k pages when superpages are not appropriate or available. Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel

...index 7bfe365..1e1dc76 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -175,18 +175,31 @@ static unsigned fill_balloon(struct virtio_balloon *vb, size_t num) > unsigned num_pfns; > struct page *page; > LIST_HEAD(pages); > + int page_order = 0; > > /* We can only do one array worth at a time. */ > num = min(num, ARRAY_SIZE(vb->pfns)); > > + if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_THP_ORDER)) > + page_order = VIRTIO_BALLOON_THP_ORDER; > + > for (num_pfns = 0; num_pfns < num; >...

...index 7bfe365..1e1dc76 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -175,18 +175,31 @@ static unsigned fill_balloon(struct virtio_balloon *vb, size_t num) > unsigned num_pfns; > struct page *page; > LIST_HEAD(pages); > + int page_order = 0; > > /* We can only do one array worth at a time. */ > num = min(num, ARRAY_SIZE(vb->pfns)); > > + if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_THP_ORDER)) > + page_order = VIRTIO_BALLOON_THP_ORDER; > + > for (num_pfns = 0; num_pfns < num; >...

...index 7bfe365..1e1dc76 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -175,18 +175,31 @@ static unsigned fill_balloon(struct virtio_balloon *vb, size_t num) > unsigned num_pfns; > struct page *page; > LIST_HEAD(pages); > + int page_order = 0; > > /* We can only do one array worth at a time. */ > num = min(num, ARRAY_SIZE(vb->pfns)); > > + if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_THP_ORDER)) > + page_order = VIRTIO_BALLOON_THP_ORDER; > + > for (num_pfns = 0; num_pfns < num; >...

From: Zhang Xiantao <xiantao.zhang@intel.com> With virtual EPT support, L1 hyerpvisor can use EPT hardware for L2 guest''s memory virtualization. In this way, L2 guest''s performance can be improved sharply. According to our testing, some benchmarks can show > 5x performance gain. Signed-off-by: Zhang Xiantao <xiantao.zhang@intel.com> Zhang Xiantao (11):

...a/mm/page_alloc.c b/mm/page_alloc.c index d5d7944954b3..fef74720d8b4 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -8221,6 +8221,15 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count, if (!page_ref_count(page)) { if (PageBuddy(page)) iter += (1 << page_order(page)) - 1; + /* + * Memory devices allow to offline a page if it is + * marked PG_offline and has a reference count of 0. + * However, the pages are not movable as it would be + * required e.g., for alloc_contig_range(). + */ + if (PageOffline(page) && !(flags & SKIP_OFFL...

...+ * The page block passed from the caller is not on this free list > + * anymore (e.g. a 1MB free page block has been split). In this case, > + * offer the first page block on the free list that the caller is > + * asking for. > + */ > + if (PageBuddy(*page) && order != page_order(*page)) { > + *page = list_first_entry(this_list, struct page, lru); > + ret = 0; > + goto out; > + } > + > + /* > + * The page block passed from the caller has been the last page block > + * on the list. > + */ > + if ((*page)->lru.next == this_list) { > +...

...+ * The page block passed from the caller is not on this free list > + * anymore (e.g. a 1MB free page block has been split). In this case, > + * offer the first page block on the free list that the caller is > + * asking for. > + */ > + if (PageBuddy(*page) && order != page_order(*page)) { > + *page = list_first_entry(this_list, struct page, lru); > + ret = 0; > + goto out; > + } > + > + /* > + * The page block passed from the caller has been the last page block > + * on the list. > + */ > + if ((*page)->lru.next == this_list) { > +...

...c > index d5d7944954b3..fef74720d8b4 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -8221,6 +8221,15 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count, > if (!page_ref_count(page)) { > if (PageBuddy(page)) > iter += (1 << page_order(page)) - 1; > + /* > + * Memory devices allow to offline a page if it is > + * marked PG_offline and has a reference count of 0. > + * However, the pages are not movable as it would be > + * required e.g., for alloc_contig_range(). > + */ > + if (PageOffline(page)...

...c > index d5d7944954b3..fef74720d8b4 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -8221,6 +8221,15 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count, > if (!page_ref_count(page)) { > if (PageBuddy(page)) > iter += (1 << page_order(page)) - 1; > + /* > + * Memory devices allow to offline a page if it is > + * marked PG_offline and has a reference count of 0. > + * However, the pages are not movable as it would be > + * required e.g., for alloc_contig_range(). > + */ > + if (PageOffline(page)...

...+ goto out; + } + + /** + * The page block passed from the caller is not on this free list + * anymore (e.g. a 1MB free page block has been split). In this case, + * offer the first page block on the free list that the caller is + * asking for. + */ + if (PageBuddy(*page) && order != page_order(*page)) { + *page = list_first_entry(this_list, struct page, lru); + ret = 0; + goto out; + } + + /** + * The page block passed from the caller has been the last page block + * on the list. + */ + if ((*page)->lru.next == this_list) { + *page = NULL; + ret = 1; + goto out; + } + + /** +...

...; + goto out; + } + + /* + * The page block passed from the caller is not on this free list + * anymore (e.g. a 1MB free page block has been split). In this case, + * offer the first page block on the free list that the caller is + * asking for. + */ + if (PageBuddy(*page) && order != page_order(*page)) { + *page = list_first_entry(this_list, struct page, lru); + ret = 0; + goto out; + } + + /* + * The page block passed from the caller has been the last page block + * on the list. + */ + if ((*page)->lru.next == this_list) { + *page = NULL; + ret = 1; + goto out; + } + + /* +...

...+ goto out; + } + + /** + * The page block passed from the caller is not on this free list + * anymore (e.g. a 1MB free page block has been split). In this case, + * offer the first page block on the free list that the caller is + * asking for. + */ + if (PageBuddy(*page) && order != page_order(*page)) { + *page = list_first_entry(this_list, struct page, lru); + ret = 0; + goto out; + } + + /** + * The page block passed from the caller has been the last page block + * on the list. + */ + if ((*page)->lru.next == this_list) { + *page = NULL; + ret = 1; + goto out; + } + + /** +...

...; + goto out; + } + + /* + * The page block passed from the caller is not on this free list + * anymore (e.g. a 1MB free page block has been split). In this case, + * offer the first page block on the free list that the caller is + * asking for. + */ + if (PageBuddy(*page) && order != page_order(*page)) { + *page = list_first_entry(this_list, struct page, lru); + ret = 0; + goto out; + } + + /* + * The page block passed from the caller has been the last page block + * on the list. + */ + if ((*page)->lru.next == this_list) { + *page = NULL; + ret = 1; + goto out; + } + + /* +...

...; + goto out; + } + + /* + * The page block passed from the caller is not on this free list + * anymore (e.g. a 1MB free page block has been split). In this case, + * offer the first page block on the free list that the caller is + * asking for. + */ + if (PageBuddy(*page) && order != page_order(*page)) { + *page = list_first_entry(free_list, struct page, lru); + ret = 0; + goto out; + } + + /* + * The page block passed from the caller has been the last page block + * on the list. + */ + if ((*page)->lru.next == free_list) { + *page = NULL; + ret = -EAGAIN; + goto out; + } + +...

...fef74720d8b4 100644 >> --- a/mm/page_alloc.c >> +++ b/mm/page_alloc.c >> @@ -8221,6 +8221,15 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count, >> if (!page_ref_count(page)) { >> if (PageBuddy(page)) >> iter += (1 << page_order(page)) - 1; >> + /* >> + * Memory devices allow to offline a page if it is >> + * marked PG_offline and has a reference count of 0. >> + * However, the pages are not movable as it would be >> + * required e.g., for alloc_contig_range(). >> + */ >&g...

...ed from the caller is not on this free list > > + * anymore (e.g. a 1MB free page block has been split). In this case, > > + * offer the first page block on the free list that the caller is > > + * asking for. > > + */ > > + if (PageBuddy(*page) && order != page_order(*page)) { > > + *page = list_first_entry(this_list, struct page, lru); > > + ret = 0; > > + goto out; > > + } > > + > > + /* > > + * The page block passed from the caller has been the last page block > > + * on the list. > > + */ > >...

Xen: 3.1.2 (or thereabouts), 64bit dom0: 2.6.18.8, pae pv-ops, 2.6.26 BUG: unable to handle kernel paging request at 69746174 IP: [<c015e221>] move_freepages+0x61/0xc0 *pdpt = 0000000204ed6007 Oops: 0002 [#1] SMP Modules linked in: Pid: 6859, comm: sh Not tainted (2.6.26-linode13 #1) EIP: 0061:[<c015e221>] EFLAGS: 00010002 CPU: 2 EIP is at move_freepages+0x61/0xc0 EAX: 69746174 EBX:

Xen: 3.1.2 (or thereabouts), 64bit dom0: 2.6.18.8, pae pv-ops, 2.6.26 BUG: unable to handle kernel paging request at 69746174 IP: [<c015e221>] move_freepages+0x61/0xc0 *pdpt = 0000000204ed6007 Oops: 0002 [#1] SMP Modules linked in: Pid: 6859, comm: sh Not tainted (2.6.26-linode13 #1) EIP: 0061:[<c015e221>] EFLAGS: 00010002 CPU: 2 EIP is at move_freepages+0x61/0xc0 EAX: 69746174 EBX: