Re: [PATCH] mm: limit lowmem_reserve

[Con Kolivas]

On Saturday 08 April 2006 10:55, Nick Piggin wrote:
> Con Kolivas wrote:
> > On Friday 07 April 2006 22:40, Nick Piggin wrote:
> >>How would zone_watermark_ok always fail though?
> >
> > Withdrew this patch a while back; ignore
>
> Well, whether or not that particular patch isa good idea, it
> is definitely a bug if zone_watermark_ok could ever always
> fail due to lowmem reserve and we should fix it.

Ok. I think I presented enough information for why I thought zone_watermark_ok 
would fail (for ZONE_DMA). With 16MB ZONE_DMA and a vmsplit of 3GB we have a 
lowmem_reserve of 12MB. It's pretty hard to keep that much ZONE_DMA free, I 
don't think I've ever seen that much free on my ZONE_DMA on an ordinary 
desktop without any particular ZONE_DMA users. Changing the tunable can make 
the lowmem_reserve larger than ZONE_DMA is on any vmsplit too as far as I 
understand the ratio.

-- 
-ck
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