Re: io_request_lock patch?

[Jonathan Lahr <lahr@us.ibm.com>]

Jens Axboe [axboe@suse.de] wrote:
> On Mon, Jul 09 2001, Jonathan Lahr wrote:
> > 
> > I have heard that a patch to reduce io_request_lock contention by
> > breaking it into per queue locks was released in the past.  Does 
> > anyone know where I could find this patch if it exists?
> 
> I had a patch about a year ago that did it safely for the block layer
> and IDE at least, and also for selected SCSI hba's. Some of the latter
> variety are pretty hard and/or tedious to fixup, Eric Y has done some
> work automating this process almost completely. Until that is done, the
> general patch has no chance of being integrated.

I am investigating reducing io_request_lock contention in the shorter term
if possible with smaller incremental modifications.  So I'm first trying to 
discover any previous work that might have been done toward this purpose.

-- 
Jonathan Lahr
IBM Linux Technology Center
Beaverton, Oregon
lahr@us.ibm.com
503-578-3385