mirror of
https://github.com/torvalds/linux.git
synced 2024-11-30 16:11:38 +00:00
08a9ad8bf6
Maintain statistics per cgroup and export these to user space. These statistics are essential for verifying whether the proper I/O priorities have been assigned to requests. An example of the statistics data with this patch applied: $ cat /sys/fs/cgroup/io.stat 11:2 rbytes=0 wbytes=0 rios=3 wios=0 dbytes=0 dios=0 [NONE] dispatched=0 inserted=0 merged=171 [RT] dispatched=0 inserted=0 merged=0 [BE] dispatched=0 inserted=0 merged=0 [IDLE] dispatched=0 inserted=0 merged=0 8:32 rbytes=2142720 wbytes=0 rios=105 wios=0 dbytes=0 dios=0 [NONE] dispatched=0 inserted=0 merged=171 [RT] dispatched=0 inserted=0 merged=0 [BE] dispatched=0 inserted=0 merged=0 [IDLE] dispatched=0 inserted=0 merged=0 Cc: Damien Le Moal <damien.lemoal@wdc.com> Cc: Hannes Reinecke <hare@suse.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Ming Lei <ming.lei@redhat.com> Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com> Cc: Himanshu Madhani <himanshu.madhani@oracle.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20210618004456.7280-16-bvanassche@acm.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
115 lines
2.7 KiB
C
115 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
|
|
#if !defined(_MQ_DEADLINE_CGROUP_H_)
|
|
#define _MQ_DEADLINE_CGROUP_H_
|
|
|
|
#include <linux/blk-cgroup.h>
|
|
|
|
struct request_queue;
|
|
|
|
/**
|
|
* struct io_stats_per_prio - I/O statistics per I/O priority class.
|
|
* @inserted: Number of inserted requests.
|
|
* @merged: Number of merged requests.
|
|
* @dispatched: Number of dispatched requests.
|
|
* @completed: Number of I/O completions.
|
|
*/
|
|
struct io_stats_per_prio {
|
|
local_t inserted;
|
|
local_t merged;
|
|
local_t dispatched;
|
|
local_t completed;
|
|
};
|
|
|
|
/* I/O statistics per I/O cgroup per I/O priority class (IOPRIO_CLASS_*). */
|
|
struct blkcg_io_stats {
|
|
struct io_stats_per_prio stats[4];
|
|
};
|
|
|
|
/**
|
|
* struct dd_blkcg - Per cgroup data.
|
|
* @cpd: blkcg_policy_data structure.
|
|
* @stats: I/O statistics.
|
|
*/
|
|
struct dd_blkcg {
|
|
struct blkcg_policy_data cpd; /* must be the first member */
|
|
struct blkcg_io_stats __percpu *stats;
|
|
};
|
|
|
|
/*
|
|
* Count one event of type 'event_type' and with I/O priority class
|
|
* 'prio_class'.
|
|
*/
|
|
#define ddcg_count(ddcg, event_type, prio_class) do { \
|
|
if (ddcg) { \
|
|
struct blkcg_io_stats *io_stats = get_cpu_ptr((ddcg)->stats); \
|
|
\
|
|
BUILD_BUG_ON(!__same_type((ddcg), struct dd_blkcg *)); \
|
|
BUILD_BUG_ON(!__same_type((prio_class), u8)); \
|
|
local_inc(&io_stats->stats[(prio_class)].event_type); \
|
|
put_cpu_ptr(io_stats); \
|
|
} \
|
|
} while (0)
|
|
|
|
/*
|
|
* Returns the total number of ddcg_count(ddcg, event_type, prio_class) calls
|
|
* across all CPUs. No locking or barriers since it is fine if the returned
|
|
* sum is slightly outdated.
|
|
*/
|
|
#define ddcg_sum(ddcg, event_type, prio) ({ \
|
|
unsigned int cpu; \
|
|
u32 sum = 0; \
|
|
\
|
|
BUILD_BUG_ON(!__same_type((ddcg), struct dd_blkcg *)); \
|
|
BUILD_BUG_ON(!__same_type((prio), u8)); \
|
|
for_each_present_cpu(cpu) \
|
|
sum += local_read(&per_cpu_ptr((ddcg)->stats, cpu)-> \
|
|
stats[(prio)].event_type); \
|
|
sum; \
|
|
})
|
|
|
|
#ifdef CONFIG_BLK_CGROUP
|
|
|
|
/**
|
|
* struct dd_blkg - Per (cgroup, request queue) data.
|
|
* @pd: blkg_policy_data structure.
|
|
*/
|
|
struct dd_blkg {
|
|
struct blkg_policy_data pd; /* must be the first member */
|
|
};
|
|
|
|
struct dd_blkcg *dd_blkcg_from_bio(struct bio *bio);
|
|
int dd_activate_policy(struct request_queue *q);
|
|
void dd_deactivate_policy(struct request_queue *q);
|
|
int __init dd_blkcg_init(void);
|
|
void __exit dd_blkcg_exit(void);
|
|
|
|
#else /* CONFIG_BLK_CGROUP */
|
|
|
|
static inline struct dd_blkcg *dd_blkcg_from_bio(struct bio *bio)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline int dd_activate_policy(struct request_queue *q)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void dd_deactivate_policy(struct request_queue *q)
|
|
{
|
|
}
|
|
|
|
static inline int dd_blkcg_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void dd_blkcg_exit(void)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_BLK_CGROUP */
|
|
|
|
#endif /* _MQ_DEADLINE_CGROUP_H_ */
|