00mm2 pte clear not present.patch
Subsystems (4)
PATCH 2/9 00mm2 pte clear not present.patch
Change pte_clear_full to a more appropriately named pte_clear_not_present, allowing optimizations when not-present mapping changes need not be reflected in the hardware TLB for protected page table modes. There is also another case that can use it in the fremap code.
Signed-off-by Zachary Amsden <[email protected]>
Signed-off-by Jeremy Fitzhardinge <[email protected]>
--- include/asm-generic/pgtable.h | 4 ++-- mm/fremap.c | 2 +- mm/memory.c | 2 +- 3 files changed, 4 insertions(+), 4 deletions(-)
===================================================================
include/asm-generic/pgtable.h +7 -2
@@ -110,8 +110,13 @@ do { \ })#endif -#ifndef __HAVE_ARCH_PTE_CLEAR_FULL -#define pte_clear_full (__mm, __address, __ptep, __full) \ +/* +* Some architectures may be able to avoid expensive synchronization +* primitives when modifications are made to PTE's which are already +* not present, or in the process of an address space destruction. +*/ +#ifndef __HAVE_ARCH_PTE_CLEAR_NOT_PRESENT_FULL +#define pte_clear_not_present_full (__mm, __address, __ptep, __full) \ do { \ pte_clear((__mm), (__address), (__ptep)); \ } while (0)
===================================================================
mm/fremap.c +1 -1
@@ -39,7 +39,7 @@ static int zap_pte(struct mm_struct *mm, }else {if (!pte_file (pte))free_swap_and_cache (pte_to_swp_entry (pte)); -pte_clear (mm, addr, ptep); +pte_clear_not_present_full (mm, addr, ptep,0 ); }return !!page; }
===================================================================
mm/memory.c +1 -1
@@ -689,7 +689,7 @@ static unsigned long zap_pte_range(struccontinue ;if (!pte_file (ptent))free_swap_and_cache (pte_to_swp_entry (ptent)); -pte_clear_full (mm, addr, pte, tlb->fullmm); +pte_clear_not_present_full (mm, addr, pte, tlb->fullmm); }while (pte++, addr +=PAGE_SIZE , (addr != end && *zap_work >0 ));add_mm_rss (mm, file_rss, anon_rss);
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