| Message ID | 20230816195447.3703954-9-bvanassche@acm.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Improve performance for zoned UFS devices | expand |
On 8/17/23 04:53, Bart Van Assche wrote: > An I/O scheduler that serializes zoned writes is only needed if the SCSI > LLD does not preserve the write order. Hence only set > ELEVATOR_F_ZBD_SEQ_WRITE if the LLD does not preserve the write order. > > Cc: Martin K. Petersen <martin.petersen@oracle.com> > Cc: Damien Le Moal <dlemoal@kernel.org> > Cc: Christoph Hellwig <hch@lst.de> > Cc: Ming Lei <ming.lei@redhat.com> > Signed-off-by: Bart Van Assche <bvanassche@acm.org> Looks OK to me. Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c index a25215507668..718b31bed878 100644 --- a/drivers/scsi/sd_zbc.c +++ b/drivers/scsi/sd_zbc.c @@ -955,7 +955,9 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE]) /* The drive satisfies the kernel restrictions: set it up */ blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q); - blk_queue_required_elevator_features(q, ELEVATOR_F_ZBD_SEQ_WRITE); + if (!q->limits.driver_preserves_write_order) + blk_queue_required_elevator_features(q, + ELEVATOR_F_ZBD_SEQ_WRITE); if (sdkp->zones_max_open == U32_MAX) disk_set_max_open_zones(disk, 0); else
An I/O scheduler that serializes zoned writes is only needed if the SCSI LLD does not preserve the write order. Hence only set ELEVATOR_F_ZBD_SEQ_WRITE if the LLD does not preserve the write order. Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: Damien Le Moal <dlemoal@kernel.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Ming Lei <ming.lei@redhat.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> --- drivers/scsi/sd_zbc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)