Re: [DATAPOINT] pre7-6 will not swap

[Benjamin Redelings I <bredelin@ucla.edu>]

> --------------- mm/vmscan.c around line 113 --------------
>         /*
>          * Don't do any of the expensive stuff if
>          * we're not really interested in this zone.
>          */
>         if (!page->zone->zone_wake_kswapd)
>                 goto out_unlock;
> ----------------------------------------------------------
> 
> Benjamin, can you comment this line out and see if it improves things?

	OK, reverted this.  I also reverted to "count = nr_threads / (priority
+ 1)", I hope that doesn't cause a problem.
	With the above patch reverted, the system swaps amazingly well, as
opposed to almost never.  It swaps out tasks in the correct order.  It
is also a bit more aggressive than pre7-4, swapping out unused daemons
even when there is lots of cache that presumably could be freed (e.g.
BEFORE I run netscape).  But this seems to be the right decision, given
that that stuff isn't swapped back in later.
	After running lots of processes, I can also say that this kernel does
not have a permanent cache size of 30Mb/64Mb.  It actually decreases
eventually instead of swapping out foreground programs like before.


	Does this mean that the zone_wake_kswapd essentially has the wrong
value, so that we don't even balance the zone for which we were called?

-benRI
UP PPro, 64MB RAM, IDE
-- 
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Benjamin Redelings I      <><     http://www.bol.ucla.edu/~bredelin/
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