Re: Lockmeter Analysis of 2 DDs

[lahr]

>      Indeed, io_request_lock is very hot once the bounce buffers were
> eliminated. Is anyone working on a patch for the io_request_lock that
> possibly take the global lock and splits it into a per device queue lock?
> We understand that getting this patch into 2.4 is unlikely, but it would
> be nice to have this patch available on 2.4 for experimental purposes.

I recently published a patch for 2.4 that addresses this exact issue at
http://lse.sourceforge.net/io/

Jonathan

-- 
Jonathan Lahr
IBM Linux Technology Center
Beaverton, Oregon
[e-mail]
503-578-3385