Messages in this thread | | | Date | Sat, 08 Apr 2006 11:25:11 +1000 | From | Nick Piggin <> | Subject | Re: [PATCH] mm: limit lowmem_reserve |
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Con Kolivas wrote: > 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. >
Umm, for ZONE_DMA allocations, ZONE_DMA isn't a lower zone. So that 12MB protection should never come into it (unless it is buggy?).
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