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Commit 394ffa50 authored by Gu Zheng's avatar Gu Zheng Committed by Jens Axboe
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blk: introduce generic io stat accounting help function 



Many block drivers accounting io stat based on bio (e.g. NVMe...),
the blk_account_io_start/end() which is based on request
does not make sense to them, so here we introduce the similar help
function named generic_start/end_io_acct base on raw sectors, and it can
simplify some driver's open io accounting code.

Signed-off-by: default avatarGu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent b657d7e6

block/bio.c

+28 −0
Original line number Diff line number Diff line
@@ -1739,6 +1739,34 @@ void bio_check_pages_dirty(struct bio *bio) 
	}

}



void generic_start_io_acct(int rw, unsigned long sectors,

			   struct hd_struct *part)

{

	int cpu = part_stat_lock();



	part_round_stats(cpu, part);

	part_stat_inc(cpu, part, ios[rw]);

	part_stat_add(cpu, part, sectors[rw], sectors);

	part_inc_in_flight(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)

{

	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_stat_unlock();

}

EXPORT_SYMBOL(generic_end_io_acct);



#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE

void bio_flush_dcache_pages(struct bio *bi)

{

include/linux/bio.h

+5 −0
Original line number Diff line number Diff line
@@ -443,6 +443,11 @@ 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);



#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE

# error	"You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"

#endif