Re: [RFC] 2.3.39 zone balancing

[Rik van Riel <riel@nl.linux.org>]

On Thu, 13 Jan 2000, Kanoj Sarcar wrote:

	[snip Linus' winning idea]

> Yes, that's what everyone seems to be pointing at. As I mentioned, I am
> looking into this as I type. The only thing is, as Andrea points out, 
> 2.3 bh/irq handlers do not request HIGHMEM pages, so shouldn't the
> 2.3 kswapd do something more like: 
> 
>        more_work = 0;
>        for (i = 0; i < MAX_NR_ZONES; i++) {
> 		if (i != ZONE_HIGHMEM)
>                		more_work |= balance_zone(zone+i)
>        }
>        if (!more_work)
>                sleep()

Nope. We want to do page aging and reclamation in ZONE_HIGHMEM
too, otherwise all memory `rotation' is going to happen in the
other zones and the system can thrash in the remaining 1G of
memory while there's 3G of unused data in ZONE_HIGHMEM...

But I agree, we probably don't have to reclaim that many pages
in ZONE_HIGHMEM, something like freepages.min should be enough.

regards,

Rik
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