block: disable multi-page bvec



The multi-page bvec is resulting in the performance regression on
UFS devices in sequential read test for upto ~9%. Hence, disable
it as a workaround.

Change-Id: I1dc3f5e710fd1c9a76f32e3144a0081df755ea26
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>

parent e8b3c550

block/bio.c

+1 −3

Original line number	Diff line number	Diff line
		@@ -806,9 +806,7 @@ bool __bio_try_merge_page(struct bio bio, struct page page,
		if (bio->bi_vcnt > 0) {
		struct bio_vec *bv = &bio->bi_io_vec[bio->bi_vcnt - 1];

		if (page_is_mergeable(bv, page, len, off, same_page)) {
		if (bio->bi_iter.bi_size > UINT_MAX - len)
		return false;
		if (page == bv->bv_page && off == bv->bv_offset + bv->bv_len) {
		bv->bv_len += len;
		bio->bi_iter.bi_size += len;
		return true;