Warning: [PATCH] embryotic page ageing with lists

[Roger Larsson <roger.larsson@norran.net>]

Hi,

More testing has revieled that something strange happens...
(as always) as patched on test3-pre6 will try to patch on
a newer (or older more stable) kernel tonight.

X craches when I fire up Netscape and hovers the mouse over
the "shortcut" area... (Bus error)

I have got segmentation faults with
 time stress_diskread
And it is time that cores...!!!

It is like the page is indicated as read - but then it is
gone...

/RogerL

Roger Larsson wrote:
> 
> Hi,
> 
> (Sent this to linux-mm only and waited... I have not got it back yet
>  more than 2 h later - resending it to linux-kernel too)
> 
> This is a embryotic, but with heart beats, patch of page ageing
> for test3-pre6.
> 
> Features:
> * does NOT add any field in page structure.
> * round robin lists is used to simulate ageing.
> * referenced pages are moved 5 steps forward.
> * non freeable, tryagain, are moved 3 steps forward.
> * new pages are inserted 2 steps forward.
> * no pages are moved backward or to currently scanned.
> 
> Future work:
> * trim offsets / size / priority
> * remove code that unnecessary sets page as referenced (riel?)
> * add more offsets depending on why the page could not
>   be freed.
> * split pagemap_lru_lock (if wanted on SMP)
> * move pages of zones with pressure less forward...
> * ...
> 
> /RogerL
> 
> --
> Home page:
>   http://www.norran.net/nra02596/
> 
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>                                    Encoding: 7bit

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