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Seperate read and write statistics of in_flight requests

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Currently, there is a single in_flight counter measuring the number of
requests in the request_queue. But some monitoring tools would like to
know how many read requests and write requests are in progress. Split the
current in_flight counter into two seperate counters for read and write.

This information is exported as a sysfs attribute, as changing the
currently available stat files would break the existing tools.

Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Nikanth Karthikesan
2009-09-11 09:18:54 +02:00
committed by Jens Axboe
parent 18d8217bc4
commit a9327cac44
6 changed files with 42 additions and 19 deletions
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21
include/linux/genhd.h
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@@ -98,7 +98,7 @@ struct hd_struct {
int make_it_fail;
#endif
unsigned long stamp;
int in_flight;
int in_flight[2];
#ifdef CONFIG_SMP
struct disk_stats *dkstats;
#else
@@ -322,18 +322,23 @@ static inline void free_part_stats(struct hd_struct *part)
#define part_stat_sub(cpu, gendiskp, field, subnd) \
part_stat_add(cpu, gendiskp, field, -subnd)
static inline void part_inc_in_flight(struct hd_struct *part)
static inline void part_inc_in_flight(struct hd_struct *part, int rw)
{
part->in_flight++;
part->in_flight[rw]++;
if (part->partno)
part_to_disk(part)->part0.in_flight++;
part_to_disk(part)->part0.in_flight[rw]++;
}
static inline void part_dec_in_flight(struct hd_struct *part)
static inline void part_dec_in_flight(struct hd_struct *part, int rw)
{
part->in_flight--;
part->in_flight[rw]--;
if (part->partno)
part_to_disk(part)->part0.in_flight--;
part_to_disk(part)->part0.in_flight[rw]--;
}
static inline int part_in_flight(struct hd_struct *part)
{
return part->in_flight[0] + part->in_flight[1];
}
/* block/blk-core.c */
@@ -546,6 +551,8 @@ extern ssize_t part_size_show(struct device *dev,
struct device_attribute *attr, char *buf);
extern ssize_t part_stat_show(struct device *dev,
struct device_attribute *attr, char *buf);
extern ssize_t part_inflight_show(struct device *dev,
struct device_attribute *attr, char *buf);
#ifdef CONFIG_FAIL_MAKE_REQUEST
extern ssize_t part_fail_show(struct device *dev,
struct device_attribute *attr, char *buf);