Re: Lockless pagecache perhaps for 2.6.18?

[Nigel Cunningham <ncunningham@cyclades.com>]

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Hi Nick.

On Monday 27 March 2006 10:43, Nick Piggin wrote:
> Nigel Cunningham wrote:
> > Can I get a pointer to the patches and any docs please? Since I save the
> > page cache separately, I'd need a good understanding of the implications
> > of the changes.
>
> Hi Nigel,
>
> http://www.kernel.org/pub/linux/kernel/people/npiggin/patches/lockless/2.6.
>16-rc5/
>
> There are some patches... a lot of them, but only the last 5 in the series
> matter (the rest are pretty much in 2.6.16-head).
>
> There is also a small doc on the lockless radix-tree in that directory. I'm
> in the process of writing some documentation on the lockless pagecache
> itself...
>
> You probably don't need to worry too much unless you are testing
> page_count() under the tree_lock, held for writing, expecting that to
> stabilise page_count. In which case I could have a look at your code and
> see if it would be a problem.

Thanks.

I'm not far from head now, so guess I have no problems with the rest.

From what you say about the other patches, I think I'm fine as far as the rest 
go too. I was mostly concerned that the modifications might make it possible 
for the lru to start changing while the image is being written. It looks to 
me now like I was being too paranoid (which isn't necessarily a bad thing, is 
it?).

Regards,

Nigel

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