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From: Stephan von Krawczynski <skraw@ithnet.com>
Cc: Andreas Steinmetz <ast@domdv.de>, <linux-kernel@vger.kernel.org>
Date: Sun, 16 Sep 2001 23:59:33 +0100
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Subject: Re: broken VM in 2.4.10-pre9
To: Linus Torvalds <torvalds@transmeta.com>
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> [...]                                                               
> Anybody willing to test the simple used-once cleanups? No           
guarantees, but                                                       
> at least they make sense (some of the old interactions certainly do 
not).                                                                 
                                                                      
Very willing. Just send it to me, please.                             
                                                                      
> (The new code is a simple state machine:                            
>                                                                     
>  - touch non-referenced page: set the reference bit                 
>                                                                     
>  - touch already referenced page: move it to next list "upwards" (ie
the                                                                   
>    active list)                                                     
>                                                                     
>  - age a non-referenced page on a list: move to "next" list         
downwards (ie                                                         
>    free if already inactive, move to inactive if currently active)  
>                                                                     
>  - age a referenced page on a list: clear ref bit and move to       
beginning of                                                          
>    same list.                                                       
                                                                      
Are you sure about the _beginning_? You are aging out _all_ non-ref   
pages in the next step?                                               
                                                                      
Regards,                                                              
Stephan