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authorJeff Dike <jdike@addtoit.com>2008-02-05 09:31:07 +0300
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 20:44:29 +0300
commit0b4e273fb83bce5dd8e166a4defb16ebdd215abf (patch)
tree18f30fe9092dacf9a7e3474a9b0d692d91962242 /arch/um/kernel/tlb.c
parent909e90d3c410b684e564729145f7c20dad887757 (diff)
downloadlinux-0b4e273fb83bce5dd8e166a4defb16ebdd215abf.tar.xz
uml: customize tlb.h
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>
Diffstat (limited to 'arch/um/kernel/tlb.c')
-rw-r--r--arch/um/kernel/tlb.c25
1 files changed, 18 insertions, 7 deletions
diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c
index 8127ca8d5957..0b6a77def311 100644
--- a/arch/um/kernel/tlb.c
+++ b/arch/um/kernel/tlb.c
@@ -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)