diff options
| author |   Laurent Dufour <ldufour@linux.vnet.ibm.com> | 2015-12-03 11:29:19 +0100 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2015-12-17 22:40:58 +1100 |
| commit | 7207f43665b83ed7881c5111bc45475ccf5ce48b (patch) | |
| tree | 5107de607cd7b08392c7d0ab1a28741464fe7a5d /arch/powerpc/include/asm/book3s/64/hash-64k.h | |
| parent | powerpc/kernel: Combine vec/loc for STD_EXCEPTION_PSERIES (diff) | |
| download | linux-dev-7207f43665b83ed7881c5111bc45475ccf5ce48b.tar.xz linux-dev-7207f43665b83ed7881c5111bc45475ccf5ce48b.zip | |
powerpc/mm: Add page soft dirty tracking
User space checkpoint and restart tool (CRIU) needs the page's change
to be soft tracked. This allows to do a pre checkpoint and then dump
only touched pages.
This is done by using a newly assigned PTE bit (_PAGE_SOFT_DIRTY) when
the page is backed in memory, and a new _PAGE_SWP_SOFT_DIRTY bit when
the page is swapped out.
To introduce a new PTE _PAGE_SOFT_DIRTY bit value common to hash 4k
and hash 64k pte, the bits already defined in hash-*4k.h should be
shifted left by one.
The _PAGE_SWP_SOFT_DIRTY bit is dynamically put after the swap type in
the swap pte. A check is added to ensure that the bit is not
overwritten by _PAGE_HPTEFLAGS.
Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/book3s/64/hash-64k.h')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/hash-64k.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/hash-64k.h b/arch/powerpc/include/asm/book3s/64/hash-64k.h index 9f9942998587..9e55e3b1fef0 100644 --- a/arch/powerpc/include/asm/book3s/64/hash-64k.h +++ b/arch/powerpc/include/asm/book3s/64/hash-64k.h @@ -25,8 +25,8 @@ #define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) -#define _PAGE_COMBO 0x00020000 /* this is a combo 4k page */ -#define _PAGE_4K_PFN 0x00040000 /* PFN is for a single 4k page */ +#define _PAGE_COMBO 0x00040000 /* this is a combo 4k page */ +#define _PAGE_4K_PFN 0x00080000 /* PFN is for a single 4k page */ /* * Used to track subpage group valid if _PAGE_COMBO is set * This overloads _PAGE_F_GIX and _PAGE_F_SECOND |