Commit 47a00410 authored by Jens Axboe's avatar Jens Axboe Committed by Jens Axboe
Browse files

[BLOCK] Document the READ/WRITE splitup of the disk stats 



Use the symbolic name where appropriate and add a comment to the
disk_stats structure.

Signed-off-by: default avatarJens Axboe <axboe@suse.de>
parent cff3ba22

block/genhd.c

+8 −6
Original line number Diff line number Diff line
@@ -391,12 +391,14 @@ static ssize_t disk_stats_read(struct gendisk * disk, char *page) 
		"%8u %8u %8llu %8u "

		"%8u %8u %8u"

		"\n",

		disk_stat_read(disk, ios[0]), disk_stat_read(disk, merges[0]),

		(unsigned long long)disk_stat_read(disk, sectors[0]),

		jiffies_to_msecs(disk_stat_read(disk, ticks[0])),

		disk_stat_read(disk, ios[1]), disk_stat_read(disk, merges[1]),

		(unsigned long long)disk_stat_read(disk, sectors[1]),

		jiffies_to_msecs(disk_stat_read(disk, ticks[1])),

		disk_stat_read(disk, ios[READ]),

		disk_stat_read(disk, merges[READ]),

		(unsigned long long)disk_stat_read(disk, sectors[READ]),

		jiffies_to_msecs(disk_stat_read(disk, ticks[READ])),

		disk_stat_read(disk, ios[WRITE]),

		disk_stat_read(disk, merges[WRITE]),

		(unsigned long long)disk_stat_read(disk, sectors[WRITE]),

		jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])),

		disk->in_flight,

		jiffies_to_msecs(disk_stat_read(disk, io_ticks)),

		jiffies_to_msecs(disk_stat_read(disk, time_in_queue)));

include/linux/genhd.h

+2 −2
Original line number Diff line number Diff line
@@ -78,7 +78,7 @@ struct hd_struct { 
	sector_t start_sect;

	sector_t nr_sects;

	struct kobject kobj;

	unsigned ios[2], sectors[2];

	unsigned ios[2], sectors[2];	/* READs and WRITEs */

	int policy, partno;

};
@@ -89,7 +89,7 @@ struct hd_struct { 
#define GENHD_FL_SUPPRESS_PARTITION_INFO	32



struct disk_stats {

	unsigned sectors[2];

	unsigned sectors[2];		/* READs and WRITEs */

	unsigned ios[2];

	unsigned merges[2];

	unsigned ticks[2];