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block: add bio_start_io_acct_time() to control start_time 

bio_start_io_acct_time() interface is like bio_start_io_acct() that
allows start_time to be passed in. This gives drivers the ability to
defer starting accounting until after IO is issued (but possibily not
entirely due to bio splitting).

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Link: https://lore.kernel.org/r/20220128155841.39644-2-snitzer@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Mike Snitzer 2022-01-28 10:58:39 -05:00 committed by Jens Axboe
parent 10825410b9
commit e45c47d1f9
2 changed files with 20 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
block/blk-core.c
View File

@ -1061,21 +1061,33 @@ again:
}
static unsigned long __part_start_io_acct(struct block_device *part,
unsigned int sectors, unsigned int op)
unsigned int sectors, unsigned int op,
unsigned long start_time)
{
const int sgrp = op_stat_group(op);
unsigned long now = READ_ONCE(jiffies);
part_stat_lock();
update_io_ticks(part, now, false);
update_io_ticks(part, start_time, false);
part_stat_inc(part, ios[sgrp]);
part_stat_add(part, sectors[sgrp], sectors);
part_stat_local_inc(part, in_flight[op_is_write(op)]);
part_stat_unlock();
return now;
return start_time;
}
/**
* bio_start_io_acct_time - start I/O accounting for bio based drivers
* @bio: bio to start account for
* @start_time: start time that should be passed back to bio_end_io_acct().
*/
void bio_start_io_acct_time(struct bio *bio, unsigned long start_time)
{
__part_start_io_acct(bio->bi_bdev, bio_sectors(bio),
bio_op(bio), start_time);
}
EXPORT_SYMBOL_GPL(bio_start_io_acct_time);
/**
* bio_start_io_acct - start I/O accounting for bio based drivers
* @bio: bio to start account for
@ -1084,14 +1096,15 @@ static unsigned long __part_start_io_acct(struct block_device *part,
*/
unsigned long bio_start_io_acct(struct bio *bio)
{
return __part_start_io_acct(bio->bi_bdev, bio_sectors(bio), bio_op(bio));
return __part_start_io_acct(bio->bi_bdev, bio_sectors(bio),
bio_op(bio), jiffies);
}
EXPORT_SYMBOL_GPL(bio_start_io_acct);
unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
unsigned int op)
{
return __part_start_io_acct(disk->part0, sectors, op);
return __part_start_io_acct(disk->part0, sectors, op, jiffies);
}
EXPORT_SYMBOL(disk_start_io_acct);

1
include/linux/blkdev.h
View File

@ -1258,6 +1258,7 @@ unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
void disk_end_io_acct(struct gendisk *disk, unsigned int op,
unsigned long start_time);
void bio_start_io_acct_time(struct bio *bio, unsigned long start_time);
unsigned long bio_start_io_acct(struct bio *bio);
void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
struct block_device *orig_bdev);