Change the data type of start and end time IO accounting variables in,
block layer, from "unsigned long" to "u64". This is to enable nano-seconds
granularity, in next commit, for the devices whose latency is less than
milliseconds.
Changes from V2 to V3
=====================
1. Changed all the required variables data-type to u64 as part of this
first patch
2. Create a new setting '2' for iostats in sysfs in next patch
3. Change the code to get the ktime values when iostat=2 in next patch
Signed-off-by: Gulam Mohamed <gulam.moha...@oracle.com>
---
block/blk-core.c | 24 ++++++++++++------------
block/blk.h | 2 +-
drivers/block/drbd/drbd_int.h | 2 +-
drivers/block/zram/zram_drv.c | 4 ++--
drivers/md/bcache/request.c | 10 +++++-----
drivers/md/dm-core.h | 2 +-
drivers/md/dm.c | 2 +-
drivers/md/md.h | 2 +-
drivers/md/raid1.h | 2 +-
drivers/md/raid10.h | 2 +-
drivers/md/raid5.c | 2 +-
drivers/nvdimm/btt.c | 2 +-
drivers/nvdimm/pmem.c | 2 +-
include/linux/blk_types.h | 2 +-
include/linux/blkdev.h | 12 ++++++------
include/linux/part_stat.h | 2 +-
16 files changed, 37 insertions(+), 37 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 8ab21dd01cd1..5670032fe932 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -927,13 +927,13 @@ int iocb_bio_iopoll(struct kiocb *kiocb, struct
io_comp_batch *iob,
}
EXPORT_SYMBOL_GPL(iocb_bio_iopoll);
-void update_io_ticks(struct block_device *part, unsigned long now, bool end)
+void update_io_ticks(struct block_device *part, u64 now, bool end)
{
- unsigned long stamp;
+ u64 stamp;
again:
stamp = READ_ONCE(part->bd_stamp);
- if (unlikely(time_after(now, stamp))) {
- if (likely(try_cmpxchg(&part->bd_stamp, &stamp, now)))
+ if (unlikely(time_after64(now, stamp))) {
+ if (likely(try_cmpxchg64(&part->bd_stamp, &stamp, now)))
__part_stat_add(part, io_ticks, end ? now - stamp : 1);
}
if (part->bd_partno) {
@@ -942,9 +942,9 @@ void update_io_ticks(struct block_device *part, unsigned
long now, bool end)
}
}
-unsigned long bdev_start_io_acct(struct block_device *bdev,
- unsigned int sectors, enum req_op op,
- unsigned long start_time)
+u64 bdev_start_io_acct(struct block_device *bdev,
+ unsigned int sectors, enum req_op op,
+ u64 start_time)
{
const int sgrp = op_stat_group(op);
@@ -965,7 +965,7 @@ EXPORT_SYMBOL(bdev_start_io_acct);
*
* Returns the start time that should be passed back to bio_end_io_acct().
*/
-unsigned long bio_start_io_acct(struct bio *bio)
+u64 bio_start_io_acct(struct bio *bio)
{
return bdev_start_io_acct(bio->bi_bdev, bio_sectors(bio),
bio_op(bio), jiffies);
@@ -973,11 +973,11 @@ unsigned long bio_start_io_acct(struct bio *bio)
EXPORT_SYMBOL_GPL(bio_start_io_acct);
void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
- unsigned long start_time)
+ u64 start_time)
{
const int sgrp = op_stat_group(op);
- unsigned long now = READ_ONCE(jiffies);
- unsigned long duration = now - start_time;
+ u64 now = READ_ONCE(jiffies);
+ u64 duration = (unsigned long)now -(unsigned long) start_time;
part_stat_lock();
update_io_ticks(bdev, now, true);
@@ -987,7 +987,7 @@ void bdev_end_io_acct(struct block_device *bdev, enum
req_op op,
}
EXPORT_SYMBOL(bdev_end_io_acct);
-void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
+void bio_end_io_acct_remapped(struct bio *bio, u64 start_time,
struct block_device *orig_bdev)
{
bdev_end_io_acct(orig_bdev, bio_op(bio), start_time);
diff --git a/block/blk.h b/block/blk.h
index 8900001946c7..8997435ad4a0 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -341,7 +341,7 @@ static inline bool blk_do_io_stat(struct request *rq)
return (rq->rq_flags & RQF_IO_STAT) && !blk_rq_is_passthrough(rq);
}
-void update_io_ticks(struct block_device *part, unsigned long now, bool end);
+void update_io_ticks(struct block_device *part, u64 now, bool end);
static inline void req_set_nomerge(struct request_queue *q, struct request
*req)
{
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index ae713338aa46..8e4d3b2eb99d 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -236,7 +236,7 @@ struct drbd_request {
struct list_head req_pending_local;
/* for generic IO accounting */
- unsigned long start_jif;
+ u64 start_jif;
/* for DRBD internal statistics */
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 966aab902d19..da28eb83e6ed 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1581,7 +1581,7 @@ static void __zram_make_request(struct zram *zram, struct
bio *bio)
u32 index;
struct bio_vec bvec;
struct bvec_iter iter;
- unsigned long start_time;
+ u64 start_time;
index = bio->bi_iter.bi_sector >> SECTORS_PER_PAGE_SHIFT;
offset = (bio->bi_iter.bi_sector &
@@ -1662,7 +1662,7 @@ static int zram_rw_page(struct block_device *bdev,
sector_t sector,
u32 index;
struct zram *zram;
struct bio_vec bv;
- unsigned long start_time;
+ u64 start_time;
if (PageTransHuge(page))
return -ENOTSUPP;
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 39c7b607f8aa..1f9bd20dcdcf 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -476,7 +476,7 @@ struct search {
unsigned int cache_missed:1;
struct block_device *orig_bdev;
- unsigned long start_time;
+ u64 start_time;
struct btree_op op;
struct data_insert_op iop;
@@ -714,7 +714,7 @@ static void search_free(struct closure *cl)
static inline struct search *search_alloc(struct bio *bio,
struct bcache_device *d, struct block_device *orig_bdev,
- unsigned long start_time)
+ u64 start_time)
{
struct search *s;
@@ -1065,7 +1065,7 @@ static void cached_dev_nodata(struct closure *cl)
struct detached_dev_io_private {
struct bcache_device *d;
- unsigned long start_time;
+ u64 start_time;
bio_end_io_t *bi_end_io;
void *bi_private;
struct block_device *orig_bdev;
@@ -1094,7 +1094,7 @@ static void detached_dev_end_io(struct bio *bio)
}
static void detached_dev_do_request(struct bcache_device *d, struct bio *bio,
- struct block_device *orig_bdev, unsigned long start_time)
+ struct block_device *orig_bdev, u64 start_time)
{
struct detached_dev_io_private *ddip;
struct cached_dev *dc = container_of(d, struct cached_dev, disk);
@@ -1173,7 +1173,7 @@ void cached_dev_submit_bio(struct bio *bio)
struct block_device *orig_bdev = bio->bi_bdev;
struct bcache_device *d = orig_bdev->bd_disk->private_data;
struct cached_dev *dc = container_of(d, struct cached_dev, disk);
- unsigned long start_time;
+ u64 start_time;
int rw = bio_data_dir(bio);
if (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE, &d->c->flags)) ||
diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h
index 6c6bd24774f2..e620fd878b08 100644
--- a/drivers/md/dm-core.h
+++ b/drivers/md/dm-core.h
@@ -284,7 +284,7 @@ struct dm_io {
unsigned short magic;
blk_short_t flags;
spinlock_t lock;
- unsigned long start_time;
+ u64 start_time;
void *data;
struct dm_io *next;
struct dm_stats_aux stats_aux;
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index e1ea3a7bd9d9..011a85ea40da 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -494,7 +494,7 @@ static bool bio_is_flush_with_data(struct bio *bio)
static void dm_io_acct(struct dm_io *io, bool end)
{
struct dm_stats_aux *stats_aux = &io->stats_aux;
- unsigned long start_time = io->start_time;
+ u64 start_time = io->start_time;
struct mapped_device *md = io->md;
struct bio *bio = io->orig_bio;
unsigned int sectors;
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 554a9026669a..df73c1d1d960 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -711,7 +711,7 @@ struct md_thread {
struct md_io_acct {
struct bio *orig_bio;
- unsigned long start_time;
+ u64 start_time;
struct bio bio_clone;
};
diff --git a/drivers/md/raid1.h b/drivers/md/raid1.h
index ebb6788820e7..0fb5a1148745 100644
--- a/drivers/md/raid1.h
+++ b/drivers/md/raid1.h
@@ -157,7 +157,7 @@ struct r1bio {
sector_t sector;
int sectors;
unsigned long state;
- unsigned long start_time;
+ u64 start_time;
struct mddev *mddev;
/*
* original bio going to /dev/mdx
diff --git a/drivers/md/raid10.h b/drivers/md/raid10.h
index 8c072ce0bc54..4cf3eec89bf3 100644
--- a/drivers/md/raid10.h
+++ b/drivers/md/raid10.h
@@ -123,7 +123,7 @@ struct r10bio {
sector_t sector; /* virtual sector number */
int sectors;
unsigned long state;
- unsigned long start_time;
+ u64 start_time;
struct mddev *mddev;
/*
* original bio going to /dev/mdx
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 7b820b81d8c2..8f4364f4bda0 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5474,7 +5474,7 @@ static void raid5_align_endio(struct bio *bi)
struct r5conf *conf;
struct md_rdev *rdev;
blk_status_t error = bi->bi_status;
- unsigned long start_time = md_io_acct->start_time;
+ u64 start_time = md_io_acct->start_time;
bio_put(bi);
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 0297b7882e33..8fc1d5da747c 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1442,7 +1442,7 @@ static void btt_submit_bio(struct bio *bio)
struct bio_integrity_payload *bip = bio_integrity(bio);
struct btt *btt = bio->bi_bdev->bd_disk->private_data;
struct bvec_iter iter;
- unsigned long start;
+ u64 start;
struct bio_vec bvec;
int err = 0;
bool do_acct;
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 96e6e9a5f235..b5b7a709e1ab 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -202,7 +202,7 @@ static void pmem_submit_bio(struct bio *bio)
int ret = 0;
blk_status_t rc = 0;
bool do_acct;
- unsigned long start;
+ u64 start;
struct bio_vec bvec;
struct bvec_iter iter;
struct pmem_device *pmem = bio->bi_bdev->bd_disk->private_data;
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 99be590f952f..d3386ac3b470 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -41,7 +41,7 @@ struct block_device {
sector_t bd_start_sect;
sector_t bd_nr_sectors;
struct disk_stats __percpu *bd_stats;
- unsigned long bd_stamp;
+ u64 bd_stamp;
bool bd_read_only; /* read-only policy */
dev_t bd_dev;
atomic_t bd_openers;
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 2db2ad72af0f..ca94d690d292 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1433,14 +1433,14 @@ static inline void blk_wake_io_task(struct task_struct
*waiter)
wake_up_process(waiter);
}
-unsigned long bdev_start_io_acct(struct block_device *bdev,
+u64 bdev_start_io_acct(struct block_device *bdev,
unsigned int sectors, enum req_op op,
- unsigned long start_time);
+ u64 start_time);
void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
- unsigned long start_time);
+ u64 start_time);
-unsigned long bio_start_io_acct(struct bio *bio);
-void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
+u64 bio_start_io_acct(struct bio *bio);
+void bio_end_io_acct_remapped(struct bio *bio, u64 start_time,
struct block_device *orig_bdev);
/**
@@ -1448,7 +1448,7 @@ void bio_end_io_acct_remapped(struct bio *bio, unsigned
long start_time,
* @bio: bio to end account for
* @start_time: start time returned by bio_start_io_acct()
*/
-static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
+static inline void bio_end_io_acct(struct bio *bio, u64 start_time)
{
return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
}
diff --git a/include/linux/part_stat.h b/include/linux/part_stat.h
index abeba356bc3f..85c50235693c 100644
--- a/include/linux/part_stat.h
+++ b/include/linux/part_stat.h
@@ -10,7 +10,7 @@ struct disk_stats {
unsigned long sectors[NR_STAT_GROUPS];
unsigned long ios[NR_STAT_GROUPS];
unsigned long merges[NR_STAT_GROUPS];
- unsigned long io_ticks;
+ u64 io_ticks;
local_t in_flight[2];
};
--
2.31.1
