[PATCH] vmscan.c improvements - slightly less swap, latency, readability

Hi,

Another patch that tries to clean up some stuff.
* readability improvements in kswapd.
* do_try_to_free_pages:
  * loop fewer times
  * quit attempt to free pages if there is no memory pressure.
 => Corrected behaviour, avoiding costly runs of shrink_mmap

Note:
 shrink_mmap is not corrected,
 it can still end up in an almost infinite loop.  

- Not finding any page in requested zones.
- No zones with pressure at call. 

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Home page:
  http://www.norran.net/nra02596/