lisa/android_kernel_xiaomi_sm8350
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block: disable multi-page bvec

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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>
This commit is contained in:
Sahitya Tummala 2020-11-25 16:40:26 +05:30
parent e8b3c55035
commit 1bbb4bd9c3
1 changed files with 1 additions and 3 deletions
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block/bio.c
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@ -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;