linux-kernel - Re: [PATCH] iov_iter: optimise bvec iov_iter

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Date:   Wed, 9 Dec 2020 08:33:41 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Pavel Begunkov <asml.silence@...il.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iov_iter: optimise bvec iov_iter_advance()

On Thu, Dec 03, 2020 at 11:48:56AM +0000, Pavel Begunkov wrote:
> It's inlined and the on-stack iter is completely optimised out. Frankly,
> I'd rather not open-code bvec_iter_advance(), at least for this chunk to
> be findable from bvec.h, e.g. grep bvec_iter and bvec_for_each. Though,
> I don't like myself that preamble/postamble.

Ok.  I still think we at least want a separate helper instead of
bloating the main iov_iter_advance.