[PATCH 2/4] block: pass in queue to inflight accounting

Jens Axboe
2017-08-03T20:01:54Z

No functional change in this patch, just in preparation for
basing the inflight mechanism on the queue in question.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
block/bio.c | 16 ++++++++--------
block/blk-core.c | 22 ++++++++++++----------
block/blk-merge.c | 4 ++--
block/genhd.c | 4 ++--
block/partition-generic.c | 5 +++--
drivers/block/drbd/drbd_req.c | 10 +++++++---
drivers/block/rsxx/dev.c | 6 +++---
drivers/block/zram/zram_drv.c | 5 +++--
drivers/md/bcache/request.c | 7 ++++---
drivers/md/dm.c | 6 +++---
drivers/nvdimm/nd.h | 5 +++--
include/linux/bio.h | 9 +++++----
include/linux/genhd.h | 14 +++++++++-----
13 files changed, 64 insertions(+), 49 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 9cf98b29588a..4d751a5b56f0 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1729,29 +1729,29 @@ void bio_check_pages_dirty(struct bio *bio)
}
}

-void generic_start_io_acct(int rw, unsigned long sectors,
- struct hd_struct *part)
+void generic_start_io_acct(struct request_queue *q, int rw,
+ unsigned long sectors, struct hd_struct *part)
{
int cpu = part_stat_lock();

- part_round_stats(cpu, part);
+ part_round_stats(q, cpu, part);
part_stat_inc(cpu, part, ios[rw]);
part_stat_add(cpu, part, sectors[rw], sectors);
- part_inc_in_flight(part, rw);
+ part_inc_in_flight(q, part, rw);

part_stat_unlock();
}
EXPORT_SYMBOL(generic_start_io_acct);

-void generic_end_io_acct(int rw, struct hd_struct *part,
- unsigned long start_time)
+void generic_end_io_acct(struct request_queue *q, int rw,
+ struct hd_struct *part, unsigned long start_time)
{
unsigned long duration = jiffies - start_time;
int cpu = part_stat_lock();

part_stat_add(cpu, part, ticks[rw], duration);
- part_round_stats(cpu, part);
- part_dec_in_flight(part, rw);
+ part_round_stats(q, cpu, part);
+ part_dec_in_flight(q, part, rw);

part_stat_unlock();
}
diff --git a/block/blk-core.c b/block/blk-core.c
index af393d5a9680..ba88d71b442f 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1469,15 +1469,15 @@ static void add_acct_request(struct request_queue *q, struct request *rq,
__elv_add_request(q, rq, where);
}

-static void part_round_stats_single(int cpu, struct hd_struct *part,
- unsigned long now)
+static void part_round_stats_single(struct request_queue *q, int cpu,
+ struct hd_struct *part, unsigned long now)
{
int inflight;

if (now == part->stamp)
return;

- inflight = part_in_flight(part);
+ inflight = part_in_flight(q, part);
if (inflight) {
__part_stat_add(cpu, part, time_in_queue,
inflight * (now - part->stamp));
@@ -1488,6 +1488,7 @@ static void part_round_stats_single(int cpu, struct hd_struct *part,

/**
* part_round_stats() - Round off the performance stats on a struct disk_stats.
+ * @q: target block queue
* @cpu: cpu number for stats access
* @part: target partition
*
@@ -1502,13 +1503,14 @@ static void part_round_stats_single(int cpu, struct hd_struct *part,
* /proc/diskstats. This accounts immediately for all queue usage up to
* the current jiffies and restarts the counters again.
*/
-void part_round_stats(int cpu, struct hd_struct *part)
+void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part)
{
unsigned long now = jiffies;

if (part->partno)
- part_round_stats_single(cpu, &part_to_disk(part)->part0, now);
- part_round_stats_single(cpu, part, now);
+ part_round_stats_single(q, cpu, &part_to_disk(part)->part0,
+ now);
+ part_round_stats_single(q, cpu, part, now);
}
EXPORT_SYMBOL_GPL(part_round_stats);

@@ -2434,8 +2436,8 @@ void blk_account_io_done(struct request *req)

part_stat_inc(cpu, part, ios[rw]);
part_stat_add(cpu, part, ticks[rw], duration);
- part_round_stats(cpu, part);
- part_dec_in_flight(part, rw);
+ part_round_stats(req->q, cpu, part);
+ part_dec_in_flight(req->q, part, rw);

hd_struct_put(part);
part_stat_unlock();
@@ -2492,8 +2494,8 @@ void blk_account_io_start(struct request *rq, bool new_io)
part = &rq->rq_disk->part0;
hd_struct_get(part);
}
- part_round_stats(cpu, part);
- part_inc_in_flight(part, rw);
+ part_round_stats(rq->q, cpu, part);
+ part_inc_in_flight(rq->q, part, rw);
rq->part = part;
}

diff --git a/block/blk-merge.c b/block/blk-merge.c
index 99038830fb42..05f116bfb99d 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -633,8 +633,8 @@ static void blk_account_io_merge(struct request *req)
cpu = part_stat_lock();
part = req->part;

- part_round_stats(cpu, part);
- part_dec_in_flight(part, rq_data_dir(req));
+ part_round_stats(req->q, cpu, part);
+ part_dec_in_flight(req->q, part, rq_data_dir(req));

hd_struct_put(part);
part_stat_unlock();
diff --git a/block/genhd.c b/block/genhd.c
index 7f520fa25d16..f735af67a0c9 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1217,7 +1217,7 @@ static int diskstats_show(struct seq_file *seqf, void *v)
disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0);
while ((hd = disk_part_iter_next(&piter))) {
cpu = part_stat_lock();
- part_round_stats(cpu, hd);
+ part_round_stats(gp->queue, cpu, hd);
part_stat_unlock();
seq_printf(seqf, "%4d %7d %s %lu %lu %lu "
"%u %lu %lu %lu %u %u %u %u\n",
@@ -1231,7 +1231,7 @@ static int diskstats_show(struct seq_file *seqf, void *v)
part_stat_read(hd, merges[WRITE]),
part_stat_read(hd, sectors[WRITE]),
jiffies_to_msecs(part_stat_read(hd, ticks[WRITE])),
- part_in_flight(hd),
+ part_in_flight(gp->queue, hd),
jiffies_to_msecs(part_stat_read(hd, io_ticks)),
jiffies_to_msecs(part_stat_read(hd, time_in_queue))
);
diff --git a/block/partition-generic.c b/block/partition-generic.c
index c5ec8246e25e..d1bdd61e1d71 100644
--- a/block/partition-generic.c
+++ b/block/partition-generic.c
@@ -112,10 +112,11 @@ ssize_t part_stat_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
+ struct request_queue *q = dev_to_disk(dev)->queue;
int cpu;

cpu = part_stat_lock();
- part_round_stats(cpu, p);
+ part_round_stats(q, cpu, p);
part_stat_unlock();
return sprintf(buf,
"%8lu %8lu %8llu %8u "
@@ -130,7 +131,7 @@ ssize_t part_stat_show(struct device *dev,
part_stat_read(p, merges[WRITE]),
(unsigned long long)part_stat_read(p, sectors[WRITE]),
jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
- part_in_flight(p),
+ part_in_flight(q, p),
jiffies_to_msecs(part_stat_read(p, io_ticks)),
jiffies_to_msecs(part_stat_read(p, time_in_queue)));
}
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index f6e865b2d543..8d6b5d137b5e 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -36,14 +36,18 @@ static bool drbd_may_do_local_read(struct drbd_device *device, sector_t sector,
/* Update disk stats at start of I/O request */
static void _drbd_start_io_acct(struct drbd_device *device, struct drbd_request *req)
{
- generic_start_io_acct(bio_data_dir(req->master_bio), req->i.size >> 9,
- &device->vdisk->part0);
+ struct request_queue *q = device->rq_queue;
+
+ generic_start_io_acct(q, bio_data_dir(req->master_bio),
+ req->i.size >> 9, &device->vdisk->part0);
}

/* Update disk stats when completing request upwards */
static void _drbd_end_io_acct(struct drbd_device *device, struct drbd_request *req)
{
- generic_end_io_acct(bio_data_dir(req->master_bio),
+ struct request_queue *q = device->rq_queue;
+
+ generic_end_io_acct(q, bio_data_dir(req->master_bio),
&device->vdisk->part0, req->start_jif);
}

diff --git a/drivers/block/rsxx/dev.c b/drivers/block/rsxx/dev.c
index 7f4acebf4657..e397d3ee7308 100644
--- a/drivers/block/rsxx/dev.c
+++ b/drivers/block/rsxx/dev.c
@@ -112,7 +112,7 @@ static const struct block_device_operations rsxx_fops = {

static void disk_stats_start(struct rsxx_cardinfo *card, struct bio *bio)
{
- generic_start_io_acct(bio_data_dir(bio), bio_sectors(bio),
+ generic_start_io_acct(card->queue, bio_data_dir(bio), bio_sectors(bio),
&card->gendisk->part0);
}

@@ -120,8 +120,8 @@ static void disk_stats_complete(struct rsxx_cardinfo *card,
struct bio *bio,
unsigned long start_time)
{
- generic_end_io_acct(bio_data_dir(bio), &card->gendisk->part0,
- start_time);
+ generic_end_io_acct(card->queue, bio_data_dir(bio),
+ &card->gendisk->part0, start_time);
}

static void bio_dma_done_cb(struct rsxx_cardinfo *card,
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index debee952dcc1..56746f420faa 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -811,9 +811,10 @@ static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index,
{
unsigned long start_time = jiffies;
int rw_acct = is_write ? REQ_OP_WRITE : REQ_OP_READ;
+ struct request_queue *q = zram->disk->queue;
int ret;

- generic_start_io_acct(rw_acct, bvec->bv_len >> SECTOR_SHIFT,
+ generic_start_io_acct(q, rw_acct, bvec->bv_len >> SECTOR_SHIFT,
&zram->disk->part0);

if (!is_write) {
@@ -825,7 +826,7 @@ static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index,
ret = zram_bvec_write(zram, bvec, index, offset);
}

- generic_end_io_acct(rw_acct, &zram->disk->part0, start_time);
+ generic_end_io_acct(q, rw_acct, &zram->disk->part0, start_time);

if (unlikely(ret)) {
if (!is_write)
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 019b3df9f1c6..72eb97176403 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -607,7 +607,8 @@ static void request_endio(struct bio *bio)
static void bio_complete(struct search *s)
{
if (s->orig_bio) {
- generic_end_io_acct(bio_data_dir(s->orig_bio),
+ struct request_queue *q = bdev_get_queue(s->orig_bio->bi_bdev);
+ generic_end_io_acct(q, bio_data_dir(s->orig_bio),
&s->d->disk->part0, s->start_time);

trace_bcache_request_end(s->d, s->orig_bio);
@@ -959,7 +960,7 @@ static blk_qc_t cached_dev_make_request(struct request_queue *q,
struct cached_dev *dc = container_of(d, struct cached_dev, disk);
int rw = bio_data_dir(bio);

- generic_start_io_acct(rw, bio_sectors(bio), &d->disk->part0);
+ generic_start_io_acct(q, rw, bio_sectors(bio), &d->disk->part0);

bio->bi_bdev = dc->bdev;
bio->bi_iter.bi_sector += dc->sb.data_offset;
@@ -1074,7 +1075,7 @@ static blk_qc_t flash_dev_make_request(struct request_queue *q,
struct bcache_device *d = bio->bi_bdev->bd_disk->private_data;
int rw = bio_data_dir(bio);

- generic_start_io_acct(rw, bio_sectors(bio), &d->disk->part0);
+ generic_start_io_acct(q, rw, bio_sectors(bio), &d->disk->part0);

s = search_alloc(bio, d);
cl = &s->cl;
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 402946035308..856c4d69e743 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -516,7 +516,7 @@ static void start_io_acct(struct dm_io *io)
io->start_time = jiffies;

cpu = part_stat_lock();
- part_round_stats(cpu, &dm_disk(md)->part0);
+ part_round_stats(md->queue, cpu, &dm_disk(md)->part0);
part_stat_unlock();
atomic_set(&dm_disk(md)->part0.in_flight[rw],
atomic_inc_return(&md->pending[rw]));
@@ -535,7 +535,7 @@ static void end_io_acct(struct dm_io *io)
int pending;
int rw = bio_data_dir(bio);

- generic_end_io_acct(rw, &dm_disk(md)->part0, io->start_time);
+ generic_end_io_acct(md->queue, rw, &dm_disk(md)->part0, io->start_time);

if (unlikely(dm_stats_used(&md->stats)))
dm_stats_account_io(&md->stats, bio_data_dir(bio),
@@ -1408,7 +1408,7 @@ static blk_qc_t dm_make_request(struct request_queue *q, struct bio *bio)

map = dm_get_live_table(md, &srcu_idx);

- generic_start_io_acct(rw, bio_sectors(bio), &dm_disk(md)->part0);
+ generic_start_io_acct(q, rw, bio_sectors(bio), &dm_disk(md)->part0);

/* if we're suspended, we have to queue this io for later */
if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) {
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 03852d738eec..7063cad88bd9 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -383,7 +383,7 @@ static inline bool nd_iostat_start(struct bio *bio, unsigned long *start)
return false;

*start = jiffies;
- generic_start_io_acct(bio_data_dir(bio),
+ generic_start_io_acct(disk->queue, bio_data_dir(bio),
bio_sectors(bio), &disk->part0);
return true;
}
@@ -391,7 +391,8 @@ static inline void nd_iostat_end(struct bio *bio, unsigned long start)
{
struct gendisk *disk = bio->bi_bdev->bd_disk;

- generic_end_io_acct(bio_data_dir(bio), &disk->part0, start);
+ generic_end_io_acct(disk->queue, bio_data_dir(bio), &disk->part0,
+ start);
}
static inline bool is_bad_pmem(struct badblocks *bb, sector_t sector,
unsigned int len)
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 4907bea03908..c447959968c1 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -447,10 +447,11 @@ extern struct bio *bio_copy_kern(struct request_queue *, void *, unsigned int,
extern void bio_set_pages_dirty(struct bio *bio);
extern void bio_check_pages_dirty(struct bio *bio);

-void generic_start_io_acct(int rw, unsigned long sectors,
- struct hd_struct *part);
-void generic_end_io_acct(int rw, struct hd_struct *part,
- unsigned long start_time);
+void generic_start_io_acct(struct request_queue *q, int rw,
+ unsigned long sectors, struct hd_struct *part);
+void generic_end_io_acct(struct request_queue *q, int rw,
+ struct hd_struct *part,
+ unsigned long start_time);

#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index e619fae2f037..7f7427e00f9c 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -362,23 +362,27 @@ static inline void free_part_stats(struct hd_struct *part)
#define part_stat_sub(cpu, gendiskp, field, subnd) \
part_stat_add(cpu, gendiskp, field, -subnd)

-static inline void part_inc_in_flight(struct hd_struct *part, int rw)
+static inline void part_inc_in_flight(struct request_queue *q,
+ struct hd_struct *part, int rw)
{
atomic_inc(&part->in_flight[rw]);
if (part->partno)
atomic_inc(&part_to_disk(part)->part0.in_flight[rw]);
}

-static inline void part_dec_in_flight(struct hd_struct *part, int rw)
+static inline void part_dec_in_flight(struct request_queue *q,
+ struct hd_struct *part, int rw)
{
atomic_dec(&part->in_flight[rw]);
if (part->partno)
atomic_dec(&part_to_disk(part)->part0.in_flight[rw]);
}

-static inline int part_in_flight(struct hd_struct *part)
+static inline int part_in_flight(struct request_queue *q,
+ struct hd_struct *part)
{
- return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]);
+ return atomic_read(&part->in_flight[0]) +
+ atomic_read(&part->in_flight[1]);
}

static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
@@ -395,7 +399,7 @@ static inline void free_part_info(struct hd_struct *part)
}

/* block/blk-core.c */
-extern void part_round_stats(int cpu, struct hd_struct *part);
+extern void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part);

/* block/genhd.c */
extern void device_add_disk(struct device *parent, struct gendisk *disk);
--
2.7.4