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

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

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe 2005-11-09 13:38:47 +01:00 committed by Jens Axboe
parent cff3ba2204
commit 47a004103d
2 changed files with 10 additions and 8 deletions
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14
block/genhd.c
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@ -391,12 +391,14 @@ static ssize_t disk_stats_read(struct gendisk * disk, char *page)
"%8u %8u %8llu %8u " "%8u %8u %8llu %8u "
"%8u %8u %8u" "%8u %8u %8u"
"\n", "\n",
disk_stat_read(disk, ios[0]), disk_stat_read(disk, merges[0]), disk_stat_read(disk, ios[READ]),
(unsigned long long)disk_stat_read(disk, sectors[0]), disk_stat_read(disk, merges[READ]),
jiffies_to_msecs(disk_stat_read(disk, ticks[0])), (unsigned long long)disk_stat_read(disk, sectors[READ]),
disk_stat_read(disk, ios[1]), disk_stat_read(disk, merges[1]), jiffies_to_msecs(disk_stat_read(disk, ticks[READ])),
(unsigned long long)disk_stat_read(disk, sectors[1]), disk_stat_read(disk, ios[WRITE]),
jiffies_to_msecs(disk_stat_read(disk, ticks[1])), 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, disk->in_flight,
jiffies_to_msecs(disk_stat_read(disk, io_ticks)), jiffies_to_msecs(disk_stat_read(disk, io_ticks)),
jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); jiffies_to_msecs(disk_stat_read(disk, time_in_queue)));

4
include/linux/genhd.h
View file

@ -78,7 +78,7 @@ struct hd_struct {
sector_t start_sect; sector_t start_sect;
sector_t nr_sects; sector_t nr_sects;
struct kobject kobj; struct kobject kobj;
unsigned ios[2], sectors[2]; unsigned ios[2], sectors[2]; /* READs and WRITEs */
int policy, partno; int policy, partno;
}; };
@ -89,7 +89,7 @@ struct hd_struct {
#define GENHD_FL_SUPPRESS_PARTITION_INFO 32 #define GENHD_FL_SUPPRESS_PARTITION_INFO 32
struct disk_stats { struct disk_stats {
unsigned sectors[2]; unsigned sectors[2]; /* READs and WRITEs */
unsigned ios[2]; unsigned ios[2];
unsigned merges[2]; unsigned merges[2];
unsigned ticks[2]; unsigned ticks[2];