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David Hildenbrand
ca215086b1
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. [[email protected]: fix comment text, per David] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: David Hildenbrand <[email protected]> Acked-by: Konstantin Khlebnikov <[email protected]> Acked-by: Michael S. Tsirkin <[email protected]> Acked-by: Pankaj gupta <[email protected]> Cc: Jonathan Corbet <[email protected]> Cc: Alexey Dobriyan <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: Christian Hansen <[email protected]> Cc: Vlastimil Babka <[email protected]> Cc: "Kirill A. Shutemov" <[email protected]> Cc: Stephen Rothwell <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Pavel Tatashin <[email protected]> Cc: Alexander Duyck <[email protected]> Cc: Naoya Horiguchi <[email protected]> Cc: Miles Chen <[email protected]> Cc: David Rientjes <[email protected]> Cc: Kazuhito Hagio <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Baoquan He <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Boris Ostrovsky <[email protected]> Cc: Dave Young <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Haiyang Zhang <[email protected]> Cc: Juergen Gross <[email protected]> Cc: Julien Freche <[email protected]> Cc: Kairui Song <[email protected]> Cc: "K. Y. Srinivasan" <[email protected]> Cc: Len Brown <[email protected]> Cc: Lianbo Jiang <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Nadav Amit <[email protected]> Cc: Omar Sandoval <[email protected]> Cc: Pavel Machek <[email protected]> Cc: Rafael J. Wysocki <[email protected]> Cc: "Rafael J. Wysocki" <[email protected]> Cc: Stefano Stabellini <[email protected]> Cc: Stephen Hemminger <[email protected]> Cc: Vitaly Kuznetsov <[email protected]> Cc: Xavier Deguillard <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
41 lines
915 B
C
41 lines
915 B
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPILINUX_KERNEL_PAGE_FLAGS_H
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#define _UAPILINUX_KERNEL_PAGE_FLAGS_H
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/*
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* Stable page flag bits exported to user space
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*/
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#define KPF_LOCKED 0
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#define KPF_ERROR 1
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#define KPF_REFERENCED 2
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#define KPF_UPTODATE 3
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#define KPF_DIRTY 4
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#define KPF_LRU 5
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#define KPF_ACTIVE 6
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#define KPF_SLAB 7
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#define KPF_WRITEBACK 8
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#define KPF_RECLAIM 9
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#define KPF_BUDDY 10
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/* 11-20: new additions in 2.6.31 */
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#define KPF_MMAP 11
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#define KPF_ANON 12
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#define KPF_SWAPCACHE 13
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#define KPF_SWAPBACKED 14
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#define KPF_COMPOUND_HEAD 15
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#define KPF_COMPOUND_TAIL 16
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#define KPF_HUGE 17
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#define KPF_UNEVICTABLE 18
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#define KPF_HWPOISON 19
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#define KPF_NOPAGE 20
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#define KPF_KSM 21
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#define KPF_THP 22
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#define KPF_OFFLINE 23
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#define KPF_ZERO_PAGE 24
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#define KPF_IDLE 25
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#define KPF_PGTABLE 26
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#endif /* _UAPILINUX_KERNEL_PAGE_FLAGS_H */
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