From ca215086b14b89a0e70fc211314944aa6ce50020 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Tue, 5 Mar 2019 15:42:23 -0800 Subject: mm: convert PG_balloon to PG_offline PG_balloon was introduced to implement page migration/compaction for pages inflated in virtio-balloon. Nowadays, it is only a marker that a page is part of virtio-balloon and therefore logically offline. We also want to make use of this flag in other balloon drivers - for inflated pages or when onlining a section but keeping some pages offline (e.g. used right now by XEN and Hyper-V via set_online_page_callback()). We are going to expose this flag to dump tools like makedumpfile. But instead of exposing PG_balloon, let's generalize the concept of marking pages as logically offline, so it can be reused for other purposes later on. Rename PG_balloon to PG_offline. This is an indicator that the page is logically offline, the content stale and that it should not be touched (e.g. a hypervisor would have to allocate backing storage in order for the guest to dump an unused page). We can then e.g. exclude such pages from dumps. We replace and reuse KPF_BALLOON (23), as this shouldn't really harm (and for now the semantics stay the same). In following patches, we will make use of this bit also in other balloon drivers. While at it, document PGTABLE. [akpm@linux-foundation.org: fix comment text, per David] Link: http://lkml.kernel.org/r/20181119101616.8901-3-david@redhat.com Signed-off-by: David Hildenbrand Acked-by: Konstantin Khlebnikov Acked-by: Michael S. Tsirkin Acked-by: Pankaj gupta Cc: Jonathan Corbet Cc: Alexey Dobriyan Cc: Mike Rapoport Cc: Christian Hansen Cc: Vlastimil Babka Cc: "Kirill A. Shutemov" Cc: Stephen Rothwell Cc: Matthew Wilcox Cc: Michal Hocko Cc: Pavel Tatashin Cc: Alexander Duyck Cc: Naoya Horiguchi Cc: Miles Chen Cc: David Rientjes Cc: Kazuhito Hagio Cc: Arnd Bergmann Cc: Baoquan He Cc: Borislav Petkov Cc: Boris Ostrovsky Cc: Dave Young Cc: Greg Kroah-Hartman Cc: Haiyang Zhang Cc: Juergen Gross Cc: Julien Freche Cc: Kairui Song Cc: "K. Y. Srinivasan" Cc: Len Brown Cc: Lianbo Jiang Cc: Michal Hocko Cc: Nadav Amit Cc: Omar Sandoval Cc: Pavel Machek Cc: Rafael J. Wysocki Cc: "Rafael J. Wysocki" Cc: Stefano Stabellini Cc: Stephen Hemminger Cc: Vitaly Kuznetsov Cc: Xavier Deguillard Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/uapi/linux/kernel-page-flags.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/uapi') diff --git a/include/uapi/linux/kernel-page-flags.h b/include/uapi/linux/kernel-page-flags.h index 21b9113c69da..6f2f2720f3ac 100644 --- a/include/uapi/linux/kernel-page-flags.h +++ b/include/uapi/linux/kernel-page-flags.h @@ -32,7 +32,7 @@ #define KPF_KSM 21 #define KPF_THP 22 -#define KPF_BALLOON 23 +#define KPF_OFFLINE 23 #define KPF_ZERO_PAGE 24 #define KPF_IDLE 25 #define KPF_PGTABLE 26 -- cgit v1.2.3