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| author | Keir Fraser <keir.fraser@citrix.com> | 2009-12-17 06:27:56 +0000 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2009-12-17 06:27:56 +0000 |
| commit | 38edca187daf8961d574f0e9cec8d775f6271e35 (patch) | |
| tree | b68271b7a481e18989fd3c769a91cd48139309ee /xen/common/page_alloc.c | |
| parent | 287d07f6a7b84d9caf6e734f987a02ef5de7561c (diff) | |
| download | xen-38edca187daf8961d574f0e9cec8d775f6271e35.tar.gz xen-38edca187daf8961d574f0e9cec8d775f6271e35.tar.bz2 xen-38edca187daf8961d574f0e9cec8d775f6271e35.zip | |
This patch defines a new PGT type called PGT_shared_page and a new synthetic
domain called 'dom_cow'. In order to share a page, the type needs to be changed
to PGT_shared_page and the owner to dom_dow. Only pages with PGT_none, and no
type count are allowed to become sharable. Conversly, sharable pages can only be
made 'private' if type count equals one. page_make_sharable() and
page_make_private() handle these transitions.
Signed-off-by: Grzegorz Milos <Grzegorz.Milos@citrix.com>
Diffstat (limited to 'xen/common/page_alloc.c')
| -rw-r--r-- | xen/common/page_alloc.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c index cb2d99cae5..19a7bd24d1 100644 --- a/xen/common/page_alloc.c +++ b/xen/common/page_alloc.c @@ -1145,7 +1145,7 @@ void free_domheap_pages(struct page_info *pg, unsigned int order) spin_unlock_recursive(&d->page_alloc_lock); } - else if ( likely(d != NULL) ) + else if ( likely(d != NULL) && likely(d != dom_cow) ) { /* NB. May recursively lock from relinquish_memory(). */ spin_lock_recursive(&d->page_alloc_lock); @@ -1172,6 +1172,13 @@ void free_domheap_pages(struct page_info *pg, unsigned int order) free_heap_pages(pg, order); } + else if ( unlikely(d == dom_cow) ) + { + ASSERT(order == 0); + scrub_one_page(pg); + free_heap_pages(pg, 0); + drop_dom_ref = 0; + } else { /* Freeing anonymous domain-heap pages. */ |