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-4k.h | |
| parent | 2613265cb5b07a46bc01eb67202874136efd7049 (diff) | |
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-4k.h')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/hash-4k.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/hash-4k.h b/arch/powerpc/include/asm/book3s/64/hash-4k.h index e59832c94609..ea0414d6659e 100644 --- a/arch/powerpc/include/asm/book3s/64/hash-4k.h +++ b/arch/powerpc/include/asm/book3s/64/hash-4k.h @@ -52,7 +52,7 @@ _PAGE_F_SECOND | _PAGE_F_GIX) /* shift to put page number into pte */ -#define PTE_RPN_SHIFT (17) +#define PTE_RPN_SHIFT (18) #define _PAGE_4K_PFN 0 #ifndef __ASSEMBLY__ |