mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
1d156646e0
blkg_rwstat is now only used by bfq-iosched and blk-throtl when on cgroup1. Let's move it into its own files and gate it behind a config option. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
150 lines
3.9 KiB
C
150 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0
|
|
*
|
|
* Legacy blkg rwstat helpers enabled by CONFIG_BLK_CGROUP_RWSTAT.
|
|
* Do not use in new code.
|
|
*/
|
|
#ifndef _BLK_CGROUP_RWSTAT_H
|
|
#define _BLK_CGROUP_RWSTAT_H
|
|
|
|
#include <linux/blk-cgroup.h>
|
|
|
|
enum blkg_rwstat_type {
|
|
BLKG_RWSTAT_READ,
|
|
BLKG_RWSTAT_WRITE,
|
|
BLKG_RWSTAT_SYNC,
|
|
BLKG_RWSTAT_ASYNC,
|
|
BLKG_RWSTAT_DISCARD,
|
|
|
|
BLKG_RWSTAT_NR,
|
|
BLKG_RWSTAT_TOTAL = BLKG_RWSTAT_NR,
|
|
};
|
|
|
|
/*
|
|
* blkg_[rw]stat->aux_cnt is excluded for local stats but included for
|
|
* recursive. Used to carry stats of dead children.
|
|
*/
|
|
struct blkg_rwstat {
|
|
struct percpu_counter cpu_cnt[BLKG_RWSTAT_NR];
|
|
atomic64_t aux_cnt[BLKG_RWSTAT_NR];
|
|
};
|
|
|
|
struct blkg_rwstat_sample {
|
|
u64 cnt[BLKG_RWSTAT_NR];
|
|
};
|
|
|
|
static inline u64 blkg_rwstat_read_counter(struct blkg_rwstat *rwstat,
|
|
unsigned int idx)
|
|
{
|
|
return atomic64_read(&rwstat->aux_cnt[idx]) +
|
|
percpu_counter_sum_positive(&rwstat->cpu_cnt[idx]);
|
|
}
|
|
|
|
int blkg_rwstat_init(struct blkg_rwstat *rwstat, gfp_t gfp);
|
|
void blkg_rwstat_exit(struct blkg_rwstat *rwstat);
|
|
u64 __blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
|
|
const struct blkg_rwstat_sample *rwstat);
|
|
u64 blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
|
|
int off);
|
|
void blkg_rwstat_recursive_sum(struct blkcg_gq *blkg, struct blkcg_policy *pol,
|
|
int off, struct blkg_rwstat_sample *sum);
|
|
|
|
|
|
/**
|
|
* blkg_rwstat_add - add a value to a blkg_rwstat
|
|
* @rwstat: target blkg_rwstat
|
|
* @op: REQ_OP and flags
|
|
* @val: value to add
|
|
*
|
|
* Add @val to @rwstat. The counters are chosen according to @rw. The
|
|
* caller is responsible for synchronizing calls to this function.
|
|
*/
|
|
static inline void blkg_rwstat_add(struct blkg_rwstat *rwstat,
|
|
unsigned int op, uint64_t val)
|
|
{
|
|
struct percpu_counter *cnt;
|
|
|
|
if (op_is_discard(op))
|
|
cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_DISCARD];
|
|
else if (op_is_write(op))
|
|
cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_WRITE];
|
|
else
|
|
cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_READ];
|
|
|
|
percpu_counter_add_batch(cnt, val, BLKG_STAT_CPU_BATCH);
|
|
|
|
if (op_is_sync(op))
|
|
cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_SYNC];
|
|
else
|
|
cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_ASYNC];
|
|
|
|
percpu_counter_add_batch(cnt, val, BLKG_STAT_CPU_BATCH);
|
|
}
|
|
|
|
/**
|
|
* blkg_rwstat_read - read the current values of a blkg_rwstat
|
|
* @rwstat: blkg_rwstat to read
|
|
*
|
|
* Read the current snapshot of @rwstat and return it in the aux counts.
|
|
*/
|
|
static inline void blkg_rwstat_read(struct blkg_rwstat *rwstat,
|
|
struct blkg_rwstat_sample *result)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < BLKG_RWSTAT_NR; i++)
|
|
result->cnt[i] =
|
|
percpu_counter_sum_positive(&rwstat->cpu_cnt[i]);
|
|
}
|
|
|
|
/**
|
|
* blkg_rwstat_total - read the total count of a blkg_rwstat
|
|
* @rwstat: blkg_rwstat to read
|
|
*
|
|
* Return the total count of @rwstat regardless of the IO direction. This
|
|
* function can be called without synchronization and takes care of u64
|
|
* atomicity.
|
|
*/
|
|
static inline uint64_t blkg_rwstat_total(struct blkg_rwstat *rwstat)
|
|
{
|
|
struct blkg_rwstat_sample tmp = { };
|
|
|
|
blkg_rwstat_read(rwstat, &tmp);
|
|
return tmp.cnt[BLKG_RWSTAT_READ] + tmp.cnt[BLKG_RWSTAT_WRITE];
|
|
}
|
|
|
|
/**
|
|
* blkg_rwstat_reset - reset a blkg_rwstat
|
|
* @rwstat: blkg_rwstat to reset
|
|
*/
|
|
static inline void blkg_rwstat_reset(struct blkg_rwstat *rwstat)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < BLKG_RWSTAT_NR; i++) {
|
|
percpu_counter_set(&rwstat->cpu_cnt[i], 0);
|
|
atomic64_set(&rwstat->aux_cnt[i], 0);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* blkg_rwstat_add_aux - add a blkg_rwstat into another's aux count
|
|
* @to: the destination blkg_rwstat
|
|
* @from: the source
|
|
*
|
|
* Add @from's count including the aux one to @to's aux count.
|
|
*/
|
|
static inline void blkg_rwstat_add_aux(struct blkg_rwstat *to,
|
|
struct blkg_rwstat *from)
|
|
{
|
|
u64 sum[BLKG_RWSTAT_NR];
|
|
int i;
|
|
|
|
for (i = 0; i < BLKG_RWSTAT_NR; i++)
|
|
sum[i] = percpu_counter_sum_positive(&from->cpu_cnt[i]);
|
|
|
|
for (i = 0; i < BLKG_RWSTAT_NR; i++)
|
|
atomic64_add(sum[i] + atomic64_read(&from->aux_cnt[i]),
|
|
&to->aux_cnt[i]);
|
|
}
|
|
#endif /* _BLK_CGROUP_RWSTAT_H */
|