search for: ioprio

Hi, The following patch adds ioprio to blktrace. Explanation: As you know, I/O schedulers such as cfq use io_contexts of current tasks to schedule block I/O. But recently, some are suggesting to use more appropriate io_contexts obtained by, for example, doing io-tracking, making struct bio have io_context member, etc. I thought addi...

...roup.c index bb8cb6f..993a3b6 100644 --- a/block/cfq-cgroup.c +++ b/block/cfq-cgroup.c @@ -20,11 +20,24 @@ static const int cfq_cgroup_slice = HZ / 10; +/* + * offset from end of service tree + */ +#define CFQ_CGROUP_IDLE_DELAY (HZ / 5) + +#define cfq_data_class_idle(cfqd) \ + ((cfqd)->ioprio_class == IOPRIO_CLASS_IDLE) +#define cfq_data_class_rt(cfqd) \ + ((cfqd)->ioprio_class == IOPRIO_CLASS_RT) + + + static struct cfq_ops cfq_cgroup_op; struct cfq_cgroup { struct cgroup_subsys_state css; unsigned int ioprio; + unsigned short ioprio_class; struct rb_root sibling_tr...

...roup.c index bb8cb6f..993a3b6 100644 --- a/block/cfq-cgroup.c +++ b/block/cfq-cgroup.c @@ -20,11 +20,24 @@ static const int cfq_cgroup_slice = HZ / 10; +/* + * offset from end of service tree + */ +#define CFQ_CGROUP_IDLE_DELAY (HZ / 5) + +#define cfq_data_class_idle(cfqd) \ + ((cfqd)->ioprio_class == IOPRIO_CLASS_IDLE) +#define cfq_data_class_rt(cfqd) \ + ((cfqd)->ioprio_class == IOPRIO_CLASS_RT) + + + static struct cfq_ops cfq_cgroup_op; struct cfq_cgroup { struct cgroup_subsys_state css; unsigned int ioprio; + unsigned short ioprio_class; struct rb_root sibling_tr...

This patch introcude cfq_cgroup structure which is type for group control within expanded CFQ scheduler. In addition, the cfq_cgroup structure has "ioprio" entry which is preference of group for I/O. Signed-off-by: Satoshi UCHIDA <s-uchida at ap.jp.nec.com> --- block/cfq-cgroup.c | 148 +++++++++++++++++++++++++++++++++++++++++ include/linux/cgroup_subsys.h | 6 ++ 2 files changed, 154 insertions(+), 0 deletions(-...

...its */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ @@ -114,18 +115,18 @@ struct virtio_blk_config { /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ - __u32 type; + __virtio32 type; /* io priority. */ - __u32 ioprio; + __virtio32 ioprio; /* Sector (ie. 512 byte offset) */ - __u64 sector; + __virtio64 sector; }; struct virtio_scsi_inhdr { - __u32 errors; - __u32 data_len; - __u32 sense_len; - __u32 residual; + __virtio32 errors; + __virtio32 data_len; + __virtio32 sense_len; + __virtio32 residual; };...

...its */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ @@ -114,18 +115,18 @@ struct virtio_blk_config { /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ - __u32 type; + __virtio32 type; /* io priority. */ - __u32 ioprio; + __virtio32 ioprio; /* Sector (ie. 512 byte offset) */ - __u64 sector; + __virtio64 sector; }; struct virtio_scsi_inhdr { - __u32 errors; - __u32 data_len; - __u32 sense_len; - __u32 residual; + __virtio32 errors; + __virtio32 data_len; + __virtio32 sense_len; + __virtio32 residual; };...

...its */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ @@ -114,18 +115,18 @@ struct virtio_blk_config { /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ - __u32 type; + __virtio32 type; /* io priority. */ - __u32 ioprio; + __virtio32 ioprio; /* Sector (ie. 512 byte offset) */ - __u64 sector; + __virtio64 sector; }; struct virtio_scsi_inhdr { - __u32 errors; - __u32 data_len; - __u32 sense_len; - __u32 residual; + __virtio32 errors; + __virtio32 data_len; + __virtio32 sense_len; + __virtio32 residual; };...

...its */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ @@ -114,18 +115,18 @@ struct virtio_blk_config { /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ - __u32 type; + __virtio32 type; /* io priority. */ - __u32 ioprio; + __virtio32 ioprio; /* Sector (ie. 512 byte offset) */ - __u64 sector; + __virtio64 sector; }; struct virtio_scsi_inhdr { - __u32 errors; - __u32 data_len; - __u32 sense_len; - __u32 residual; + __virtio32 errors; + __virtio32 data_len; + __virtio32 sense_len; + __virtio32 residual; };...

...its */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ @@ -114,18 +115,18 @@ struct virtio_blk_config { /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ - __u32 type; + __virtio32 type; /* io priority. */ - __u32 ioprio; + __virtio32 ioprio; /* Sector (ie. 512 byte offset) */ - __u64 sector; + __virtio64 sector; }; struct virtio_scsi_inhdr { - __u32 errors; - __u32 data_len; - __u32 sense_len; - __u32 residual; + __virtio32 errors; + __virtio32 data_len; + __virtio32 sense_len; + __virtio32 residual; };...

...its */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ @@ -114,18 +115,18 @@ struct virtio_blk_config { /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ - __u32 type; + __virtio32 type; /* io priority. */ - __u32 ioprio; + __virtio32 ioprio; /* Sector (ie. 512 byte offset) */ - __u64 sector; + __virtio64 sector; }; struct virtio_scsi_inhdr { - __u32 errors; - __u32 data_len; - __u32 sense_len; - __u32 residual; + __virtio32 errors; + __virtio32 data_len; + __virtio32 sense_len; + __virtio32 residual; };...

...its */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ @@ -114,18 +115,18 @@ struct virtio_blk_config { /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ - __u32 type; + __virtio32 type; /* io priority. */ - __u32 ioprio; + __virtio32 ioprio; /* Sector (ie. 512 byte offset) */ - __u64 sector; + __virtio64 sector; }; struct virtio_scsi_inhdr { - __u32 errors; - __u32 data_len; - __u32 sense_len; - __u32 residual; + __virtio32 errors; + __virtio32 data_len; + __virtio32 sense_len; + __virtio32 residual; };...

...its */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ @@ -114,18 +115,18 @@ struct virtio_blk_config { /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ - __u32 type; + __virtio32 type; /* io priority. */ - __u32 ioprio; + __virtio32 ioprio; /* Sector (ie. 512 byte offset) */ - __u64 sector; + __virtio64 sector; }; struct virtio_scsi_inhdr { - __u32 errors; - __u32 data_len; - __u32 sense_len; - __u32 residual; + __virtio32 errors; + __virtio32 data_len; + __virtio32 sense_len; + __virtio32 residual; };...

...its */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ @@ -114,18 +115,18 @@ struct virtio_blk_config { /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ - __u32 type; + __virtio32 type; /* io priority. */ - __u32 ioprio; + __virtio32 ioprio; /* Sector (ie. 512 byte offset) */ - __u64 sector; + __virtio64 sector; }; struct virtio_scsi_inhdr { - __u32 errors; - __u32 data_len; - __u32 sense_len; - __u32 residual; + __virtio32 errors; + __virtio32 data_len; + __virtio32 sense_len; + __virtio32 residual; };...

...its */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ @@ -114,18 +115,18 @@ struct virtio_blk_config { /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ - __u32 type; + __virtio32 type; /* io priority. */ - __u32 ioprio; + __virtio32 ioprio; /* Sector (ie. 512 byte offset) */ - __u64 sector; + __virtio64 sector; }; struct virtio_scsi_inhdr { - __u32 errors; - __u32 data_len; - __u32 sense_len; - __u32 residual; + __virtio32 errors; + __virtio32 data_len; + __virtio32 sense_len; + __virtio32 residual; };...

Reduce ioprio class of scrub readahead threads to idle priority. This setting is fixed. This priority has shown the best performance during all measurements. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> --- fs/btrfs/ctree.h | 3 +++ fs/btrfs/reada.c | 5 +++++ 2 files changed, 8 insert...

...its */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ @@ -114,18 +115,18 @@ struct virtio_blk_config { /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ - __u32 type; + __virtio32 type; /* io priority. */ - __u32 ioprio; + __virtio32 ioprio; /* Sector (ie. 512 byte offset) */ - __u64 sector; + __virtio64 sector; }; struct virtio_scsi_inhdr { - __u32 errors; - __u32 data_len; - __u32 sense_len; - __u32 residual; + __virtio32 errors; + __virtio32 data_len; + __virtio32 sense_len; + __virtio32 residual; };...

...its */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ @@ -114,18 +115,18 @@ struct virtio_blk_config { /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ - __u32 type; + __virtio32 type; /* io priority. */ - __u32 ioprio; + __virtio32 ioprio; /* Sector (ie. 512 byte offset) */ - __u64 sector; + __virtio64 sector; }; struct virtio_scsi_inhdr { - __u32 errors; - __u32 data_len; - __u32 sense_len; - __u32 residual; + __virtio32 errors; + __virtio32 data_len; + __virtio32 sense_len; + __virtio32 residual; };...

...its */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ @@ -114,18 +115,18 @@ struct virtio_blk_config { /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ - __u32 type; + __virtio32 type; /* io priority. */ - __u32 ioprio; + __virtio32 ioprio; /* Sector (ie. 512 byte offset) */ - __u64 sector; + __virtio64 sector; }; struct virtio_scsi_inhdr { - __u32 errors; - __u32 data_len; - __u32 sense_len; - __u32 residual; + __virtio32 errors; + __virtio32 data_len; + __virtio32 sense_len; + __virtio32 residual; };...

...its */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ @@ -114,18 +115,18 @@ struct virtio_blk_config { /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ - __u32 type; + __virtio32 type; /* io priority. */ - __u32 ioprio; + __virtio32 ioprio; /* Sector (ie. 512 byte offset) */ - __u64 sector; + __virtio64 sector; }; struct virtio_scsi_inhdr { - __u32 errors; - __u32 data_len; - __u32 sense_len; - __u32 residual; + __virtio32 errors; + __virtio32 data_len; + __virtio32 sense_len; + __virtio32 residual; };...

...; > > @@ -256,16 +259,24 @@ static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx, > > vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, type); > > vbr->out_hdr.sector = type ? > > 0 : cpu_to_virtio64(vblk->vdev, blk_rq_pos(req)); > > - vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(req)); > > + vbr->out_hdr.u.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(req)); > > > > blk_mq_start_request(req); > > > > - num = blk_rq_map_sg(hctx->queue, req, vbr->sg); > > - if (num) { >...