Commit 4c16a439 authored by Li Ruilin's avatar Li Ruilin Committed by Zheng Zengkai
Browse files

bcache: always record start time of a sample 

euleros/rtos inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4LOJ6


CVE: NA

--------------------------------

Before this patch bypassed I/O request will not record start time,
therefore when calculating latency data, start time will be calculated
wrongly. This patch makes start time always be recorded to fix this.

Signed-off-by: default avatarLi Ruilin <liruilin4@huawei.com>
Reviewed-by: default avatarSong Chao <chao.song@huawei.com>
Acked-by: default avatarXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: default avatarCheng Jian <cj.chengjian@huawei.com>
Reviewed-by: default avatarGuangxing Deng <dengguangxing@huawei.com>
Reviewed-by: default avatarchao song <chao.song@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent 6214e257

drivers/md/bcache/request.c

+6 −7
Original line number Diff line number Diff line
@@ -1252,14 +1252,13 @@ blk_qc_t cached_dev_submit_bio(struct bio *bio) 
		} else {

			s->iop.bypass = check_should_bypass(dc, bio);



			if (!s->iop.bypass && bio->bi_iter.bi_size && !rw) {

			s->smp.offset = bio->bi_iter.bi_sector - dc->sb.data_offset;

			s->smp.length = bio->bi_iter.bi_size;

			s->smp.type = rw;

			s->smp.dev = dc->bdev->bd_dev;

			s->smp.start_time = ktime_get_ns();

			if (!s->iop.bypass && bio->bi_iter.bi_size && !rw)

				save_circ_item(&s->smp);

			}



			if (rw)

				cached_dev_write(dc, s);