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| author | H. Peter Anvin <hpa@linux.intel.com> | 2013-01-29 14:59:09 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2013-01-29 15:10:15 -0800 |
| commit | de65d816aa44f9ddd79861ae21d75010cc1fd003 (patch) | |
| tree | 04a637a43b2e52a733d0dcb7595a47057571e7da /arch/x86/include/asm/pgtable_types.h | |
| parent | 9710f581bb4c35589ac046b0cfc0deb7f369fc85 (diff) | |
| parent | 5dcd14ecd41ea2b3ae3295a9b30d98769d52165f (diff) | |
| download | linux-de65d816aa44f9ddd79861ae21d75010cc1fd003.tar.bz2 | |
Merge remote-tracking branch 'origin/x86/boot' into x86/mm2
Coming patches to x86/mm2 require the changes and advanced baseline in
x86/boot.
Resolved Conflicts:
arch/x86/kernel/setup.c
mm/nobootmem.c
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/include/asm/pgtable_types.h')
| -rw-r--r-- | arch/x86/include/asm/pgtable_types.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index 79738f20aaf5..696fa7eafb1d 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -64,6 +64,26 @@ #define _PAGE_FILE (_AT(pteval_t, 1) << _PAGE_BIT_FILE) #define _PAGE_PROTNONE (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE) +/* + * _PAGE_NUMA indicates that this page will trigger a numa hinting + * minor page fault to gather numa placement statistics (see + * pte_numa()). The bit picked (8) is within the range between + * _PAGE_FILE (6) and _PAGE_PROTNONE (8) bits. Therefore, it doesn't + * require changes to the swp entry format because that bit is always + * zero when the pte is not present. + * + * The bit picked must be always zero when the pmd is present and not + * present, so that we don't lose information when we set it while + * atomically clearing the present bit. + * + * Because we shared the same bit (8) with _PAGE_PROTNONE this can be + * interpreted as _PAGE_NUMA only in places that _PAGE_PROTNONE + * couldn't reach, like handle_mm_fault() (see access_error in + * arch/x86/mm/fault.c, the vma protection must not be PROT_NONE for + * handle_mm_fault() to be invoked). + */ +#define _PAGE_NUMA _PAGE_PROTNONE + #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \ _PAGE_ACCESSED | _PAGE_DIRTY) #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \ |