Re: [00/17] Large Blocksize Support V3

[Nick Piggin]

Christoph Lameter wrote:
> On Thu, 26 Apr 2007, Nick Piggin wrote:
>
>
> > > Nick, what's the buffer layer? Are you talking about operations
> > > based on bufferheads?
> >
> > Yeah. Our pgoff_t->sector_t translation.
>
>
> Sadly the buffers in the buffer layer still assume contiguous memory. You 
> would have to add a series of pointers there and then add a layer to 
> handle this.

That's the least of the problems with rewriting the buffer layer.

But I maintain that the end result is better than the fragmentation
based approach. A lot of people don't actually want a bigger page
cache size, because they want efficient internal fragmentation as
well, so your radix-tree based approach isn't really comparable.

--
SUSE Labs, Novell Inc.
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