Re: [rtf] [patch] 2.3.99-pre6-3 overly swappy

[Rik van Riel <riel@conectiva.com.br>]

On Thu, 20 Apr 2000, Ben LaHaise wrote:

> The balance between swap and shrink_mmap was upset by the recent per-zone
> changes: kswapd wakeups now call swap_out 3 times as much as before,
> resulting in increased page faults and swap out activity, especially
> under heavy io.  This patch seems to help quite a bit -- can other people
> give this a try?

[snip]

> @@ -507,7 +509,7 @@
>  					schedule();
>  				if ((!zone->size) || (!zone->zone_wake_kswapd))
>  					continue;
> -				do_try_to_free_pages(GFP_KSWAPD, zone);
> +				do_try_to_free_pages(GFP_KSWAPD, zone, i == (MAX_NR_ZONES - 1));
>  			}
>  			pgdat = pgdat->node_next;
>  		}

This seems to mostly work for machines where each bigger zone
is a subset of the smaller zones. I don't think this scheme
would be suitable for eg. ccNUMA machines, but it may be a nice
bandaid for x86...

(I'll get to work on a more generic strategy ASAP, it'll be
very much like what I talked about on irc with Stephen and you)

regards,

Rik
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