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x86/mm/tlb: Add freed_tables argument to flush_tlb_mm_range 

Add an argument to flush_tlb_mm_range to indicate whether page tables
are about to be freed after this TLB flush. This allows for an
optimization of flush_tlb_mm_range to skip CPUs in lazy TLB mode.

No functional changes.

Cc: npiggin@gmail.com
Cc: mingo@kernel.org
Cc: will.deacon@arm.com
Cc: songliubraving@fb.com
Cc: kernel-team@fb.com
Cc: luto@kernel.org
Cc: hpa@zytor.com
Signed-off-by: Rik van Riel <riel@surriel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180926035844.1420-6-riel@surriel.com
This commit is contained in:
Rik van Riel 2018-09-25 23:58:42 -04:00 committed by Peter Zijlstra
parent 7d49b28a80
commit 016c4d92cd
5 changed files with 11 additions and 8 deletions
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2
arch/x86/include/asm/tlb.h
View File

@ -20,7 +20,7 @@ static inline void tlb_flush(struct mmu_gather *tlb)
end = tlb->end;
}
flush_tlb_mm_range(tlb->mm, start, end, stride_shift);
flush_tlb_mm_range(tlb->mm, start, end, stride_shift, tlb->freed_tables);
}
/*

10
arch/x86/include/asm/tlbflush.h
View File

@ -536,22 +536,24 @@ struct flush_tlb_info {
#define local_flush_tlb() __flush_tlb()
#define flush_tlb_mm(mm) flush_tlb_mm_range(mm, 0UL, TLB_FLUSH_ALL, 0UL)
#define flush_tlb_mm(mm) \
flush_tlb_mm_range(mm, 0UL, TLB_FLUSH_ALL, 0UL, true)
#define flush_tlb_range(vma, start, end) \
flush_tlb_mm_range((vma)->vm_mm, start, end, \
((vma)->vm_flags & VM_HUGETLB) \
? huge_page_shift(hstate_vma(vma)) \
: PAGE_SHIFT)
: PAGE_SHIFT, false)
extern void flush_tlb_all(void);
extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
unsigned long end, unsigned int stride_shift);
unsigned long end, unsigned int stride_shift,
bool freed_tables);
extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long a)
{
flush_tlb_mm_range(vma->vm_mm, a, a + PAGE_SIZE, PAGE_SHIFT);
flush_tlb_mm_range(vma->vm_mm, a, a + PAGE_SIZE, PAGE_SHIFT, false);
}
void native_flush_tlb_others(const struct cpumask *cpumask,

2
arch/x86/kernel/ldt.c
View File

@ -273,7 +273,7 @@ map_ldt_struct(struct mm_struct *mm, struct ldt_struct *ldt, int slot)
map_ldt_struct_to_user(mm);
va = (unsigned long)ldt_slot_va(slot);
flush_tlb_mm_range(mm, va, va + LDT_SLOT_STRIDE, PAGE_SHIFT);
flush_tlb_mm_range(mm, va, va + LDT_SLOT_STRIDE, PAGE_SHIFT, false);
ldt->slot = slot;
return 0;

2
arch/x86/kernel/vm86_32.c
View File

@ -199,7 +199,7 @@ static void mark_screen_rdonly(struct mm_struct *mm)
pte_unmap_unlock(pte, ptl);
out:
up_write(&mm->mmap_sem);
flush_tlb_mm_range(mm, 0xA0000, 0xA0000 + 32*PAGE_SIZE, PAGE_SHIFT);
flush_tlb_mm_range(mm, 0xA0000, 0xA0000 + 32*PAGE_SIZE, PAGE_SHIFT, false);
}

3
arch/x86/mm/tlb.c
View File

@ -609,7 +609,8 @@ void native_flush_tlb_others(const struct cpumask *cpumask,
static unsigned long tlb_single_page_flush_ceiling __read_mostly = 33;
void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
unsigned long end, unsigned int stride_shift)
unsigned long end, unsigned int stride_shift,
bool freed_tables)
{
int cpu;