linux-kernel - Re: [PATCH 5.11] block: optimise for_each

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Message-ID: <20201124112249.GB25573@infradead.org>
Date:   Tue, 24 Nov 2020 11:22:49 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Pavel Begunkov <asml.silence@...il.com>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        ming.lei@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5.11] block: optimise for_each_bvec() advance

On Tue, Nov 24, 2020 at 10:21:23AM +0000, Pavel Begunkov wrote:
> Because of how for_each_bvec() works it never advances across multiple
> entries at a time, so bvec_iter_advance() is an overkill. Add
> specialised bvec_iter_advance_single() that is faster. It also handles
> zero-len bvecs, so can kill bvec_iter_skip_zero_bvec().

bvec_iter_advance_single needs a comment describing how it can be
used.  Also can you take a look at the other callers and see who
can be switched over?  If you are not sure ask the relevant maintainers.