Matt Mackall wrote:
quoted text
> On Tue, Mar 13, 2007 at 10:30:10AM -0700, Jeremy Fitzhardinge wrote:
>   
>> Nick Piggin wrote:
>>     
>>> However we still have to visit those to-be-unmapped parts of the page
>>> table,
>>> to find the pages and free them. So we still at least need to bring it
>>> into
>>> cache for the read... at which point, the store probably isn't a big
>>> burden.
>>>       
>> Why not try to find a place to stash a linklist pointer and link them
>> all together?  Saves the pulldown pagetable walk altogether.
>>     
>
> Because we'd need one link per mm that a page is mapped in?
>   

Can pagetable pages be shared between mms?  (Kernel pmds in PAE excepted.)

    J
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