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https://github.com/brain-hackers/linux-brain.git
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c1c80384c8
We don't really need to save this stuff in the core block code, we can just pass the bio back into the helpers later on to derive the same flags and update the rq->wbt_flags appropriately. Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
142 lines
3.0 KiB
C
142 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef WB_THROTTLE_H
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#define WB_THROTTLE_H
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#include <linux/kernel.h>
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#include <linux/atomic.h>
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#include <linux/wait.h>
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#include <linux/timer.h>
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#include <linux/ktime.h>
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#include "blk-stat.h"
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#include "blk-rq-qos.h"
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enum wbt_flags {
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WBT_TRACKED = 1, /* write, tracked for throttling */
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WBT_READ = 2, /* read */
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WBT_KSWAPD = 4, /* write, from kswapd */
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WBT_DISCARD = 8, /* discard */
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WBT_NR_BITS = 4, /* number of bits */
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};
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enum {
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WBT_RWQ_BG = 0,
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WBT_RWQ_KSWAPD,
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WBT_RWQ_DISCARD,
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WBT_NUM_RWQ,
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};
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/*
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* Enable states. Either off, or on by default (done at init time),
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* or on through manual setup in sysfs.
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*/
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enum {
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WBT_STATE_ON_DEFAULT = 1,
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WBT_STATE_ON_MANUAL = 2,
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};
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struct rq_wb {
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/*
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* Settings that govern how we throttle
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*/
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unsigned int wb_background; /* background writeback */
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unsigned int wb_normal; /* normal writeback */
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short enable_state; /* WBT_STATE_* */
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/*
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* Number of consecutive periods where we don't have enough
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* information to make a firm scale up/down decision.
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*/
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unsigned int unknown_cnt;
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u64 win_nsec; /* default window size */
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u64 cur_win_nsec; /* current window size */
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struct blk_stat_callback *cb;
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u64 sync_issue;
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void *sync_cookie;
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unsigned int wc;
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unsigned long last_issue; /* last non-throttled issue */
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unsigned long last_comp; /* last non-throttled comp */
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unsigned long min_lat_nsec;
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struct rq_qos rqos;
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struct rq_wait rq_wait[WBT_NUM_RWQ];
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struct rq_depth rq_depth;
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};
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static inline struct rq_wb *RQWB(struct rq_qos *rqos)
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{
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return container_of(rqos, struct rq_wb, rqos);
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}
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static inline unsigned int wbt_inflight(struct rq_wb *rwb)
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{
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unsigned int i, ret = 0;
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for (i = 0; i < WBT_NUM_RWQ; i++)
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ret += atomic_read(&rwb->rq_wait[i].inflight);
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return ret;
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}
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#ifdef CONFIG_BLK_WBT
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int wbt_init(struct request_queue *);
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void wbt_update_limits(struct request_queue *);
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void wbt_disable_default(struct request_queue *);
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void wbt_enable_default(struct request_queue *);
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u64 wbt_get_min_lat(struct request_queue *q);
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void wbt_set_min_lat(struct request_queue *q, u64 val);
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void wbt_set_queue_depth(struct request_queue *, unsigned int);
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void wbt_set_write_cache(struct request_queue *, bool);
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u64 wbt_default_latency_nsec(struct request_queue *);
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#else
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static inline void wbt_track(struct request *rq, enum wbt_flags flags)
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{
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}
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static inline int wbt_init(struct request_queue *q)
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{
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return -EINVAL;
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}
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static inline void wbt_update_limits(struct request_queue *q)
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{
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}
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static inline void wbt_disable_default(struct request_queue *q)
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{
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}
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static inline void wbt_enable_default(struct request_queue *q)
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{
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}
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static inline void wbt_set_queue_depth(struct request_queue *q, unsigned int depth)
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{
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}
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static inline void wbt_set_write_cache(struct request_queue *q, bool wc)
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{
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}
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static inline u64 wbt_get_min_lat(struct request_queue *q)
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{
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return 0;
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}
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static inline void wbt_set_min_lat(struct request_queue *q, u64 val)
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{
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}
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static inline u64 wbt_default_latency_nsec(struct request_queue *q)
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{
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return 0;
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}
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#endif /* CONFIG_BLK_WBT */
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#endif
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