On 05/03/2013 03:36 PM, Xiao Guangrong wrote:
> On 05/01/2013 12:12 AM, Pavel Emelyanov wrote:
>
>> +static inline void clear_soft_dirty(struct vm_area_struct *vma,
>> + unsigned long addr, pte_t *pte)
>> +{
>> +#ifdef CONFIG_MEM_SOFT_DIRTY
>> + /*
>> + * The soft-dirty tracker uses #PF-s to catch writes
>> + * to pages, so write-protect the pte as well. See the
>> + * Documentation/vm/soft-dirty.txt for full description
>> + * of how soft-dirty works.
>> + */
>> + pte_t ptent = *pte;
>> + ptent = pte_wrprotect(ptent);
>> + ptent = pte_clear_flags(ptent, _PAGE_SOFT_DIRTY);
>> + set_pte_at(vma->vm_mm, addr, pte, ptent);
>> +#endif
>
> It seems that TLBs are not flushed and mmu-notification is not called?
TLBs are flushed by clear_refs_write()->flush_tlb_mm().
As far as MMU notification is concerned -- yes, you're right! I will
prepare the patch for this soon.
> .
>
Thanks,
Pavel
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