Re: [RFC] Moving dirty bitmaps to userspace - Double buffering approach

[Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>]

Avi Kivity wrote:
> On 03/15/2010 10:33 AM, Marcelo Tosatti wrote:
>>
>>> Are there any good ways to solve this kind of problems?
>>>      
>> You can introduce a new get_dirty_log ioctl that passes the address
>> of the next bitmap in userspace, and use it (after pinning with
>> get_user_pages), instead of vmalloc'ing.
>>

Thank you for your advice!

>>    
> 
> No pinning please, put_user_bit() or set_bit_user().
> 
> (can be implemented generically using get_user_pages() and 
> kmap_atomic(), but x86 should get an optimized implementation)
> 

Given your advice last time, I started this with my colleague.
  -- We were just talking about how to strugle with every architectures.

As your comment, we'll make the generic implementation with optimized one
for x86 first.

Thanks
   Takuya