On 2021-06-04 13:03, Changheun Lee wrote:
bio size can grow up to 4GB after muli-page bvec has been enabled.
But sometimes large size of bio would lead to inefficient behaviors.
Control of bio max size will be helpful to improve inefficiency.
blk_queue_max_bio_bytes() is added to enable be set the max_bio_bytes
in
each driver layer. And max_bio_bytes sysfs is added to show current
max_bio_bytes for each request queue.
bio size can be controlled via max_bio_bytes.
This is interesting, and we also noticed it right after multi-page bvec
is enabled since last year. Internally, we had a hack to disable it.
But it is good to have a tunable to control it. Thanks for the change.
Reviewed-by: Can Guo <cang@xxxxxxxxxxxxxx>
Changheun Lee (3):
bio: control bio max size
blk-sysfs: add max_bio_bytes
ufs: set max_bio_bytes with queue max sectors
Documentation/ABI/testing/sysfs-block | 10 ++++++++++
Documentation/block/queue-sysfs.rst | 7 +++++++
block/bio.c | 17 ++++++++++++++---
block/blk-settings.c | 19 +++++++++++++++++++
block/blk-sysfs.c | 7 +++++++
drivers/scsi/ufs/ufshcd.c | 5 +++++
include/linux/bio.h | 4 +++-
include/linux/blkdev.h | 3 +++
8 files changed, 68 insertions(+), 4 deletions(-)
