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Date: Sat, 2 Jan 2021 15:17:37 +0000 From: Pavel Begunkov <asml.silence@...il.com> To: linux-block@...r.kernel.org Cc: Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@...radead.org>, Matthew Wilcox <willy@...radead.org>, Ming Lei <ming.lei@...hat.com>, Johannes Weiner <hannes@...xchg.org>, Alexander Viro <viro@...iv.linux.org.uk>, "Darrick J . Wong" <darrick.wong@...cle.com>, "Martin K . Petersen" <martin.petersen@...cle.com>, Jonathan Corbet <corbet@....net>, linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org, io-uring@...r.kernel.org, linux-kernel@...r.kernel.org, target-devel@...r.kernel.org, linux-scsi@...r.kernel.org, linux-doc@...r.kernel.org, Christoph Hellwig <hch@....de> Subject: [PATCH v2 5/7] iov_iter: optimise bvec iov_iter_advance() iov_iter_advance() is heavily used, but implemented through generic means. For bvecs there is a specifically crafted function for that, so use bvec_iter_advance() instead, it's faster and slimmer. Reviewed-by: Christoph Hellwig <hch@....de> Signed-off-by: Pavel Begunkov <asml.silence@...il.com> --- lib/iov_iter.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 7de304269641..9b1c109dc8a9 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -1065,6 +1065,21 @@ static void pipe_advance(struct iov_iter *i, size_t size) pipe_truncate(i); } +static void iov_iter_bvec_advance(struct iov_iter *i, size_t size) +{ + struct bvec_iter bi; + + bi.bi_size = i->count; + bi.bi_bvec_done = i->iov_offset; + bi.bi_idx = 0; + bvec_iter_advance(i->bvec, &bi, size); + + i->bvec += bi.bi_idx; + i->nr_segs -= bi.bi_idx; + i->count = bi.bi_size; + i->iov_offset = bi.bi_bvec_done; +} + void iov_iter_advance(struct iov_iter *i, size_t size) { if (unlikely(iov_iter_is_pipe(i))) { @@ -1075,6 +1090,10 @@ void iov_iter_advance(struct iov_iter *i, size_t size) i->count -= size; return; } + if (iov_iter_is_bvec(i)) { + iov_iter_bvec_advance(i, size); + return; + } iterate_and_advance(i, size, v, 0, 0, 0) } EXPORT_SYMBOL(iov_iter_advance); -- 2.24.0
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