From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: David Hildenbrand To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, devel@linuxdriverproject.org, linux-fsdevel@vger.kernel.org, linux-pm@vger.kernel.org, xen-devel@lists.xenproject.org, kexec-ml , pv-drivers@vmware.com, David Hildenbrand , Xavier Deguillard , Nadav Amit , Arnd Bergmann , Greg Kroah-Hartman , Julien Freche , Andrew Morton , Matthew Wilcox , Michal Hocko , "Michael S. Tsirkin" Subject: [PATCH v2 6/8] vmw_balloon: mark inflated pages PG_offline Date: Thu, 22 Nov 2018 11:06:25 +0100 Message-Id: <20181122100627.5189-7-david@redhat.com> In-Reply-To: <20181122100627.5189-1-david@redhat.com> References: <20181122100627.5189-1-david@redhat.com> Sender: owner-linux-mm@kvack.org List-ID: Mark inflated and never onlined pages PG_offline, to tell the world that the content is stale and should not be dumped. Cc: Xavier Deguillard Cc: Nadav Amit Cc: Arnd Bergmann Cc: Greg Kroah-Hartman Cc: Julien Freche Cc: Andrew Morton Cc: Matthew Wilcox Cc: Michal Hocko Cc: "Michael S. Tsirkin" Acked-by: Nadav Amit Signed-off-by: David Hildenbrand --- drivers/misc/vmw_balloon.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c index e6126a4b95d3..877611b5659b 100644 --- a/drivers/misc/vmw_balloon.c +++ b/drivers/misc/vmw_balloon.c @@ -556,6 +556,36 @@ vmballoon_page_in_frames(enum vmballoon_page_size_type page_size) return 1 << vmballoon_page_order(page_size); } +/** + * vmballoon_mark_page_offline() - mark a page as offline + * @page: pointer for the page. + * @page_size: the size of the page. + */ +static void +vmballoon_mark_page_offline(struct page *page, + enum vmballoon_page_size_type page_size) +{ + int i; + + for (i = 0; i < vmballoon_page_in_frames(page_size); i++) + __SetPageOffline(page + i); +} + +/** + * vmballoon_mark_page_online() - mark a page as online + * @page: pointer for the page. + * @page_size: the size of the page. + */ +static void +vmballoon_mark_page_online(struct page *page, + enum vmballoon_page_size_type page_size) +{ + int i; + + for (i = 0; i < vmballoon_page_in_frames(page_size); i++) + __ClearPageOffline(page + i); +} + /** * vmballoon_send_get_target() - Retrieve desired balloon size from the host. * @@ -612,6 +642,7 @@ static int vmballoon_alloc_page_list(struct vmballoon *b, ctl->page_size); if (page) { + vmballoon_mark_page_offline(page, ctl->page_size); /* Success. Add the page to the list and continue. */ list_add(&page->lru, &ctl->pages); continue; @@ -850,6 +881,7 @@ static void vmballoon_release_page_list(struct list_head *page_list, list_for_each_entry_safe(page, tmp, page_list, lru) { list_del(&page->lru); + vmballoon_mark_page_online(page, page_size); __free_pages(page, vmballoon_page_order(page_size)); } -- 2.17.2