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SubjectRe: io_request_lock patch?

The bit that I had automated was to essentially fix each and every
low-level SCSI driver such that each low-level driver would be responsible
for it's own locking. At this point the patches and the tool are on hold -
once the 2.5 kernel series gets underway, I can generate some fairly massive


----- Original Message -----
From: "Jonathan Lahr" <>
To: "Jens Axboe" <>
Cc: <>; <>
Sent: Tuesday, July 10, 2001 3:49 PM
Subject: Re: io_request_lock patch?

> Jens Axboe [] 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
> discover any previous work that might have been done toward this purpose.
> --
> Jonathan Lahr
> IBM Linux Technology Center
> Beaverton, Oregon
> 503-578-3385
> -
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