linux-kernel - Re: ipi_redirect vs rq

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Message-ID: <20140127075158.GB18590@infradead.org>
Date:	Sun, 26 Jan 2014 23:51:58 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: ipi_redirect vs rq_affinity

On Fri, Jan 24, 2014 at 11:11:29AM -0800, Jens Axboe wrote:
> It is pretty much the same. I don't like the semantics of the old one,
> where it's 0/1/2 for off/on/different-on, though. Seems like now would
> be a good time to clean it up.

I don't think arbitrarily breaking this fairly widely used interface
when a driver is moving to blk-mq sounds like a good idea.  Maybe we
should allow for setting descriptive strings as well?

Also the different on semantics do matter for some use cases, and we
should support both for blk-mq.

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