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