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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
@ -91,6 +91,15 @@ struct partition {
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__le32 nr_sects; /* nr of sectors in partition */
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} __attribute__((packed));
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struct disk_stats {
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unsigned long sectors[2]; /* READs and WRITEs */
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unsigned long ios[2];
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unsigned long merges[2];
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unsigned long ticks[2];
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unsigned long io_ticks;
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unsigned long time_in_queue;
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};
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struct hd_struct {
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sector_t start_sect;
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sector_t nr_sects;
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@ -100,6 +109,13 @@ struct hd_struct {
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int policy, partno;
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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int make_it_fail;
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#endif
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unsigned long stamp;
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int in_flight;
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#ifdef CONFIG_SMP
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struct disk_stats *dkstats;
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#else
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struct disk_stats dkstats;
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#endif
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};
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@ -111,14 +127,6 @@ struct hd_struct {
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#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
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#define GENHD_FL_FAIL 64
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struct disk_stats {
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unsigned long sectors[2]; /* READs and WRITEs */
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unsigned long ios[2];
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unsigned long merges[2];
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unsigned long ticks[2];
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unsigned long io_ticks;
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unsigned long time_in_queue;
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};
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struct gendisk {
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int major; /* major number of driver */
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@ -158,6 +166,20 @@ struct gendisk {
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* The __ variants should only be called in critical sections. The full
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* variants disable/enable preemption.
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*/
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static inline struct hd_struct *get_part(struct gendisk *gendiskp,
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sector_t sector)
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{
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struct hd_struct *part;
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int i;
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for (i = 0; i < gendiskp->minors - 1; i++) {
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part = gendiskp->part[i];
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if (part && part->start_sect <= sector
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&& sector < part->start_sect + part->nr_sects)
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return part;
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}
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return NULL;
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}
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#ifdef CONFIG_SMP
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#define __disk_stat_add(gendiskp, field, addnd) \
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(per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->field += addnd)
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@ -178,14 +200,61 @@ static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
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sizeof (struct disk_stats));
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}
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#define __part_stat_add(part, field, addnd) \
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(per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
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#define __all_stat_add(gendiskp, field, addnd, sector) \
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({ \
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struct hd_struct *part = get_part(gendiskp, sector); \
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if (part) \
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__part_stat_add(part, field, addnd); \
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__disk_stat_add(gendiskp, field, addnd); \
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})
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#define part_stat_read(part, field) \
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({ \
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typeof(part->dkstats->field) res = 0; \
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int i; \
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for_each_possible_cpu(i) \
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res += per_cpu_ptr(part->dkstats, i)->field; \
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res; \
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})
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static inline void part_stat_set_all(struct hd_struct *part, int value) {
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int i;
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for_each_possible_cpu(i)
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memset(per_cpu_ptr(part->dkstats, i), value,
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sizeof(struct disk_stats));
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}
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#else
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#define __disk_stat_add(gendiskp, field, addnd) \
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(gendiskp->dkstats.field += addnd)
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#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
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static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
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static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
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{
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memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
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}
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#define __part_stat_add(part, field, addnd) \
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(part->dkstats.field += addnd)
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#define __all_stat_add(gendiskp, field, addnd, sector) \
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({ \
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struct hd_struct *part = get_part(gendiskp, sector); \
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if (part) \
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part->dkstats.field += addnd; \
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__disk_stat_add(gendiskp, field, addnd); \
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})
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#define part_stat_read(part, field) (part->dkstats.field)
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static inline void part_stat_set_all(struct hd_struct *part, int value)
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{
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memset(&part->dkstats, value, sizeof(struct disk_stats));
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}
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#endif
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#define disk_stat_add(gendiskp, field, addnd) \
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@ -206,6 +275,45 @@ static inline void disk_stat_set_all(struct gendisk *gendiskp, int value) {
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#define disk_stat_sub(gendiskp, field, subnd) \
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disk_stat_add(gendiskp, field, -subnd)
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#define part_stat_add(gendiskp, field, addnd) \
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do { \
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preempt_disable(); \
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__part_stat_add(gendiskp, field, addnd);\
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preempt_enable(); \
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} while (0)
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#define __part_stat_dec(gendiskp, field) __part_stat_add(gendiskp, field, -1)
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#define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
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#define __part_stat_inc(gendiskp, field) __part_stat_add(gendiskp, field, 1)
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#define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
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#define __part_stat_sub(gendiskp, field, subnd) \
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__part_stat_add(gendiskp, field, -subnd)
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#define part_stat_sub(gendiskp, field, subnd) \
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part_stat_add(gendiskp, field, -subnd)
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#define all_stat_add(gendiskp, field, addnd, sector) \
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do { \
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preempt_disable(); \
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__all_stat_add(gendiskp, field, addnd, sector); \
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preempt_enable(); \
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} while (0)
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#define __all_stat_dec(gendiskp, field, sector) \
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__all_stat_add(gendiskp, field, -1, sector)
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#define all_stat_dec(gendiskp, field, sector) \
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all_stat_add(gendiskp, field, -1, sector)
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#define __all_stat_inc(gendiskp, field, sector) \
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__all_stat_add(gendiskp, field, 1, sector)
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#define all_stat_inc(gendiskp, field, sector) \
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all_stat_add(gendiskp, field, 1, sector)
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#define __all_stat_sub(gendiskp, field, subnd, sector) \
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__all_stat_add(gendiskp, field, -subnd, sector)
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#define all_stat_sub(gendiskp, field, subnd, sector) \
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all_stat_add(gendiskp, field, -subnd, sector)
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/* Inlines to alloc and free disk stats in struct gendisk */
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#ifdef CONFIG_SMP
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@ -221,6 +329,20 @@ static inline void free_disk_stats(struct gendisk *disk)
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{
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free_percpu(disk->dkstats);
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}
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static inline int init_part_stats(struct hd_struct *part)
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{
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part->dkstats = alloc_percpu(struct disk_stats);
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if (!part->dkstats)
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return 0;
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return 1;
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}
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static inline void free_part_stats(struct hd_struct *part)
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{
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free_percpu(part->dkstats);
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}
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#else /* CONFIG_SMP */
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static inline int init_disk_stats(struct gendisk *disk)
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{
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@ -230,6 +352,15 @@ static inline int init_disk_stats(struct gendisk *disk)
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static inline void free_disk_stats(struct gendisk *disk)
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{
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}
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static inline int init_part_stats(struct hd_struct *part)
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{
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return 1;
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}
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static inline void free_part_stats(struct hd_struct *part)
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{
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}
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#endif /* CONFIG_SMP */
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/* drivers/block/ll_rw_blk.c */
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