Enhanced partition statistics: core statistics
This patch contain the core infrastructure of enhanced partition statistics. It adds to struct hd_struct the same stats data as struct gendisk and define basics function to manipulate them. Signed-off-by: Jerome Marchand <jmarchan@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jerome Marchand
Jens Axboe
parent
63a7138671
commit
ea5c48ab2a
1 changed files with 141 additions and 10 deletions
|
|
@ -91,6 +91,15 @@ struct partition {
|
|||
__le32 nr_sects; /* nr of sectors in partition */
|
||||
} __attribute__((packed));
|
||||
|
||||
struct disk_stats {
|
||||
unsigned long sectors[2]; /* READs and WRITEs */
|
||||
unsigned long ios[2];
|
||||
unsigned long merges[2];
|
||||
unsigned long ticks[2];
|
||||
unsigned long io_ticks;
|
||||
unsigned long time_in_queue;
|
||||
};
|
||||
|
||||
struct hd_struct {
|
||||
sector_t start_sect;
|
||||
sector_t nr_sects;
|
||||
|
|
@ -100,6 +109,13 @@ struct hd_struct {
|
|||
int policy, partno;
|
||||
#ifdef CONFIG_FAIL_MAKE_REQUEST
|
||||
int make_it_fail;
|
||||
#endif
|
||||
unsigned long stamp;
|
||||
int in_flight;
|
||||
#ifdef CONFIG_SMP
|
||||
struct disk_stats *dkstats;
|
||||
#else
|
||||
struct disk_stats dkstats;
|
||||
#endif
|
||||
};
|
||||
|
||||
|
|
@ -111,15 +127,7 @@ struct hd_struct {
|
|||
#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
|
||||
#define GENHD_FL_FAIL 64
|
||||
|
||||
struct disk_stats {
|
||||
unsigned long sectors[2]; /* READs and WRITEs */
|
||||
unsigned long ios[2];
|
||||
unsigned long merges[2];
|
||||
unsigned long ticks[2];
|
||||
unsigned long io_ticks;
|
||||
unsigned long time_in_queue;
|
||||
};
|
||||
|
||||
|
||||
struct gendisk {
|
||||
int major; /* major number of driver */
|
||||
int first_minor;
|
||||
|
|
@ -158,6 +166,20 @@ struct gendisk {
|
|||
* The __ variants should only be called in critical sections. The full
|
||||
* variants disable/enable preemption.
|
||||
*/
|
||||
static inline struct hd_struct *get_part(struct gendisk *gendiskp,
|
||||
sector_t sector)
|
||||
{
|
||||
struct hd_struct *part;
|
||||
int i;
|
||||
for (i = 0; i < gendiskp->minors - 1; i++) {
|
||||
part = gendiskp->part[i];
|
||||
if (part && part->start_sect <= sector
|
||||
&& sector < part->start_sect + part->nr_sects)
|
||||
return part;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
#define __disk_stat_add(gendiskp, field, addnd) \
|
||||
(per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
|
||||
|
|
@ -177,15 +199,62 @@ static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
|
|||
memset(per_cpu_ptr(gendiskp->dkstats, i), value,
|
||||
sizeof (struct disk_stats));
|
||||
}
|
||||
|
||||
#define __part_stat_add(part, field, addnd) \
|
||||
(per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
|
||||
|
||||
#define __all_stat_add(gendiskp, field, addnd, sector) \
|
||||
({ \
|
||||
struct hd_struct *part = get_part(gendiskp, sector); \
|
||||
if (part) \
|
||||
__part_stat_add(part, field, addnd); \
|
||||
__disk_stat_add(gendiskp, field, addnd); \
|
||||
})
|
||||
|
||||
#define part_stat_read(part, field) \
|
||||
({ \
|
||||
typeof(part->dkstats->field) res = 0; \
|
||||
int i; \
|
||||
for_each_possible_cpu(i) \
|
||||
res += per_cpu_ptr(part->dkstats, i)->field; \
|
||||
res; \
|
||||
})
|
||||
|
||||
static inline void part_stat_set_all(struct hd_struct *part, int value) {
|
||||
int i;
|
||||
for_each_possible_cpu(i)
|
||||
memset(per_cpu_ptr(part->dkstats, i), value,
|
||||
sizeof(struct disk_stats));
|
||||
}
|
||||
|
||||
#else
|
||||
#define __disk_stat_add(gendiskp, field, addnd) \
|
||||
(gendiskp->dkstats.field += addnd)
|
||||
#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
|
||||
|
||||
static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
|
||||
static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
|
||||
{
|
||||
memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
|
||||
}
|
||||
|
||||
#define __part_stat_add(part, field, addnd) \
|
||||
(part->dkstats.field += addnd)
|
||||
|
||||
#define __all_stat_add(gendiskp, field, addnd, sector) \
|
||||
({ \
|
||||
struct hd_struct *part = get_part(gendiskp, sector); \
|
||||
if (part) \
|
||||
part->dkstats.field += addnd; \
|
||||
__disk_stat_add(gendiskp, field, addnd); \
|
||||
})
|
||||
|
||||
#define part_stat_read(part, field) (part->dkstats.field)
|
||||
|
||||
static inline void part_stat_set_all(struct hd_struct *part, int value)
|
||||
{
|
||||
memset(&part->dkstats, value, sizeof(struct disk_stats));
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
#define disk_stat_add(gendiskp, field, addnd) \
|
||||
|
|
@ -206,6 +275,45 @@ static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
|
|||
#define disk_stat_sub(gendiskp, field, subnd) \
|
||||
disk_stat_add(gendiskp, field, -subnd)
|
||||
|
||||
#define part_stat_add(gendiskp, field, addnd) \
|
||||
do { \
|
||||
preempt_disable(); \
|
||||
__part_stat_add(gendiskp, field, addnd);\
|
||||
preempt_enable(); \
|
||||
} while (0)
|
||||
|
||||
#define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
|
||||
#define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
|
||||
|
||||
#define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
|
||||
#define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
|
||||
|
||||
#define __part_stat_sub(gendiskp, field, subnd) \
|
||||
__part_stat_add(gendiskp, field, -subnd)
|
||||
#define part_stat_sub(gendiskp, field, subnd) \
|
||||
part_stat_add(gendiskp, field, -subnd)
|
||||
|
||||
#define all_stat_add(gendiskp, field, addnd, sector) \
|
||||
do { \
|
||||
preempt_disable(); \
|
||||
__all_stat_add(gendiskp, field, addnd, sector); \
|
||||
preempt_enable(); \
|
||||
} while (0)
|
||||
|
||||
#define __all_stat_dec(gendiskp, field, sector) \
|
||||
__all_stat_add(gendiskp, field, -1, sector)
|
||||
#define all_stat_dec(gendiskp, field, sector) \
|
||||
all_stat_add(gendiskp, field, -1, sector)
|
||||
|
||||
#define __all_stat_inc(gendiskp, field, sector) \
|
||||
__all_stat_add(gendiskp, field, 1, sector)
|
||||
#define all_stat_inc(gendiskp, field, sector) \
|
||||
all_stat_add(gendiskp, field, 1, sector)
|
||||
|
||||
#define __all_stat_sub(gendiskp, field, subnd, sector) \
|
||||
__all_stat_add(gendiskp, field, -subnd, sector)
|
||||
#define all_stat_sub(gendiskp, field, subnd, sector) \
|
||||
all_stat_add(gendiskp, field, -subnd, sector)
|
||||
|
||||
/* Inlines to alloc and free disk stats in struct gendisk */
|
||||
#ifdef CONFIG_SMP
|
||||
|
|
@ -221,6 +329,20 @@ static inline void free_disk_stats(struct gendisk *disk)
|
|||
{
|
||||
free_percpu(disk->dkstats);
|
||||
}
|
||||
|
||||
static inline int init_part_stats(struct hd_struct *part)
|
||||
{
|
||||
part->dkstats = alloc_percpu(struct disk_stats);
|
||||
if (!part->dkstats)
|
||||
return 0;
|
||||
return 1;
|
||||
}
|
||||
|
||||
static inline void free_part_stats(struct hd_struct *part)
|
||||
{
|
||||
free_percpu(part->dkstats);
|
||||
}
|
||||
|
||||
#else /* CONFIG_SMP */
|
||||
static inline int init_disk_stats(struct gendisk *disk)
|
||||
{
|
||||
|
|
@ -230,6 +352,15 @@ static inline int init_disk_stats(struct gendisk *disk)
|
|||
static inline void free_disk_stats(struct gendisk *disk)
|
||||
{
|
||||
}
|
||||
|
||||
static inline int init_part_stats(struct hd_struct *part)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
static inline void free_part_stats(struct hd_struct *part)
|
||||
{
|
||||
}
|
||||
#endif /* CONFIG_SMP */
|
||||
|
||||
/* drivers/block/ll_rw_blk.c */
|
||||
|
|
|
|||
Loading…
Reference in a new issue