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SubjectRe: Lockmeter Analysis of 2 DDs

> 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


Jonathan Lahr
IBM Linux Technology Center
Beaverton, Oregon

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