lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

uml: customize tlb.h

Browse Source 
Customize the hooks in tlb.h to optimize TLB flushing some more.

Add start and end fields to tlb_gather_mmu, which are used to limit
the address space range scanned when a region is unmapped.

The interfaces which just free page tables, without actually changing
mappings, don't need to cause a TLB flush.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike
2008-02-04 22:31:07 -08:00
committed by Linus Torvalds
parent 909e90d3c4
commit 0b4e273fb8
2 changed files with 139 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
arch/um/kernel/tlb.c
View File

@@ -193,18 +193,18 @@ static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
if (!pte_young(*pte)) {
r = 0;
w = 0;
} else if (!pte_dirty(*pte)) {
} else if (!pte_dirty(*pte))
w = 0;
}
prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
(x ? UM_PROT_EXEC : 0));
if (hvc->force || pte_newpage(*pte)) {
if (pte_present(*pte))
ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
PAGE_SIZE, prot, hvc);
else ret = add_munmap(addr, PAGE_SIZE, hvc);
}
else if (pte_newprot(*pte))
else
ret = add_munmap(addr, PAGE_SIZE, hvc);
} else if (pte_newprot(*pte))
ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
*pte = pte_mkuptodate(*pte);
} while (pte++, addr += PAGE_SIZE, ((addr < end) && !ret));
@@ -500,7 +500,8 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
else fix_range(vma->vm_mm, start, end, 0);
}
void flush_tlb_mm(struct mm_struct *mm)
void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
unsigned long end)
{
/*
* Don't bother flushing if this address space is about to be
@@ -509,7 +510,17 @@ void flush_tlb_mm(struct mm_struct *mm)
if (atomic_read(&mm->mm_users) == 0)
return;
fix_range(mm, 0, TASK_SIZE, 0);
fix_range(mm, start, end, 0);
}
void flush_tlb_mm(struct mm_struct *mm)
{
struct vm_area_struct *vma = mm->mmap;
while (vma != NULL) {
fix_range(mm, vma->vm_start, vma->vm_end, 0);
vma = vma->vm_next;
}
}
void force_flush_all(void)