Re: news about IDE PIO HIGHMEM bug (was: Re: 2.6.9-mm1)

[Martin J. Bligh]

> Unfortunately, it's not.
> 
> The block layer just tells us "it's a contiguous run of memory", which implies nothing really about the allocation size.
> 
> Bart and I (and others?) essentially need a "page+1" thing (for 2.4.x too!), that won't break in the face of NUMA/etc.
> 
> Alternatively (or additionally), we may need to make sure the block layer doesn't merge across zones or NUMA boundaries or whatnot.


The latter would be rather more efficient. I don't know how often you 
end up doing each operation though ... the page+1 vs the attemtped merge.
Depends on the ratio,  I guess.

M.
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