Hi Nick.

On Monday 27 March 2006 10:43, Nick Piggin wrote:

Nigel Cunningham wrote:

quoted

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