mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-17 22:41:25 +00:00
3381cb8d2e
blkio_group_conf->weight is owned by cfq and has no reason to be defined in blkcg core. Replace it with cfq_group->dev_weight and let conf setting functions directly set it. If dev_weight is zero, the cfqg doesn't have device specific weight configured. Also, rename BLKIO_WEIGHT_* constants to CFQ_WEIGHT_* and rename blkio_cgroup->weight to blkio_cgroup->cfq_weight. We eventually want per-policy storage in blkio_cgroup but just mark the ownership of the field for now. Signed-off-by: Tejun Heo <tj@kernel.org>
384 lines
10 KiB
C
384 lines
10 KiB
C
#ifndef _BLK_CGROUP_H
|
|
#define _BLK_CGROUP_H
|
|
/*
|
|
* Common Block IO controller cgroup interface
|
|
*
|
|
* Based on ideas and code from CFQ, CFS and BFQ:
|
|
* Copyright (C) 2003 Jens Axboe <axboe@kernel.dk>
|
|
*
|
|
* Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it>
|
|
* Paolo Valente <paolo.valente@unimore.it>
|
|
*
|
|
* Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com>
|
|
* Nauman Rafique <nauman@google.com>
|
|
*/
|
|
|
|
#include <linux/cgroup.h>
|
|
#include <linux/u64_stats_sync.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
enum blkio_policy_id {
|
|
BLKIO_POLICY_PROP = 0, /* Proportional Bandwidth division */
|
|
BLKIO_POLICY_THROTL, /* Throttling */
|
|
|
|
BLKIO_NR_POLICIES,
|
|
};
|
|
|
|
/* Max limits for throttle policy */
|
|
#define THROTL_IOPS_MAX UINT_MAX
|
|
|
|
#ifdef CONFIG_BLK_CGROUP
|
|
|
|
/* CFQ specific, out here for blkcg->cfq_weight */
|
|
#define CFQ_WEIGHT_MIN 10
|
|
#define CFQ_WEIGHT_MAX 1000
|
|
#define CFQ_WEIGHT_DEFAULT 500
|
|
|
|
/* cft->private [un]packing for stat printing */
|
|
#define BLKCG_STAT_PRIV(pol, off) (((unsigned)(pol) << 16) | (off))
|
|
#define BLKCG_STAT_POL(prv) ((unsigned)(prv) >> 16)
|
|
#define BLKCG_STAT_OFF(prv) ((unsigned)(prv) & 0xffff)
|
|
|
|
enum blkg_rwstat_type {
|
|
BLKG_RWSTAT_READ,
|
|
BLKG_RWSTAT_WRITE,
|
|
BLKG_RWSTAT_SYNC,
|
|
BLKG_RWSTAT_ASYNC,
|
|
|
|
BLKG_RWSTAT_NR,
|
|
BLKG_RWSTAT_TOTAL = BLKG_RWSTAT_NR,
|
|
};
|
|
|
|
struct blkio_cgroup {
|
|
struct cgroup_subsys_state css;
|
|
spinlock_t lock;
|
|
struct hlist_head blkg_list;
|
|
|
|
/* for policies to test whether associated blkcg has changed */
|
|
uint64_t id;
|
|
|
|
/* TODO: per-policy storage in blkio_cgroup */
|
|
unsigned int cfq_weight; /* belongs to cfq */
|
|
};
|
|
|
|
struct blkg_stat {
|
|
struct u64_stats_sync syncp;
|
|
uint64_t cnt;
|
|
};
|
|
|
|
struct blkg_rwstat {
|
|
struct u64_stats_sync syncp;
|
|
uint64_t cnt[BLKG_RWSTAT_NR];
|
|
};
|
|
|
|
struct blkio_group_conf {
|
|
u64 iops[2];
|
|
u64 bps[2];
|
|
};
|
|
|
|
/* per-blkg per-policy data */
|
|
struct blkg_policy_data {
|
|
/* the blkg this per-policy data belongs to */
|
|
struct blkio_group *blkg;
|
|
|
|
/* Configuration */
|
|
struct blkio_group_conf conf;
|
|
|
|
/* pol->pdata_size bytes of private data used by policy impl */
|
|
char pdata[] __aligned(__alignof__(unsigned long long));
|
|
};
|
|
|
|
struct blkio_group {
|
|
/* Pointer to the associated request_queue */
|
|
struct request_queue *q;
|
|
struct list_head q_node;
|
|
struct hlist_node blkcg_node;
|
|
struct blkio_cgroup *blkcg;
|
|
/* Store cgroup path */
|
|
char path[128];
|
|
/* reference count */
|
|
int refcnt;
|
|
|
|
struct blkg_policy_data *pd[BLKIO_NR_POLICIES];
|
|
|
|
struct rcu_head rcu_head;
|
|
};
|
|
|
|
typedef void (blkio_init_group_fn)(struct blkio_group *blkg);
|
|
typedef void (blkio_exit_group_fn)(struct blkio_group *blkg);
|
|
typedef void (blkio_reset_group_stats_fn)(struct blkio_group *blkg);
|
|
|
|
struct blkio_policy_ops {
|
|
blkio_init_group_fn *blkio_init_group_fn;
|
|
blkio_exit_group_fn *blkio_exit_group_fn;
|
|
blkio_reset_group_stats_fn *blkio_reset_group_stats_fn;
|
|
};
|
|
|
|
struct blkio_policy_type {
|
|
struct list_head list;
|
|
struct blkio_policy_ops ops;
|
|
enum blkio_policy_id plid;
|
|
size_t pdata_size; /* policy specific private data size */
|
|
struct cftype *cftypes; /* cgroup files for the policy */
|
|
};
|
|
|
|
extern int blkcg_init_queue(struct request_queue *q);
|
|
extern void blkcg_drain_queue(struct request_queue *q);
|
|
extern void blkcg_exit_queue(struct request_queue *q);
|
|
|
|
/* Blkio controller policy registration */
|
|
extern void blkio_policy_register(struct blkio_policy_type *);
|
|
extern void blkio_policy_unregister(struct blkio_policy_type *);
|
|
extern void blkg_destroy_all(struct request_queue *q, bool destroy_root);
|
|
extern void update_root_blkg_pd(struct request_queue *q,
|
|
enum blkio_policy_id plid);
|
|
|
|
void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg,
|
|
u64 (*prfill)(struct seq_file *, struct blkg_policy_data *, int),
|
|
int pol, int data, bool show_total);
|
|
u64 __blkg_prfill_u64(struct seq_file *sf, struct blkg_policy_data *pd, u64 v);
|
|
u64 __blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
|
|
const struct blkg_rwstat *rwstat);
|
|
int blkcg_print_stat(struct cgroup *cgrp, struct cftype *cft,
|
|
struct seq_file *sf);
|
|
int blkcg_print_rwstat(struct cgroup *cgrp, struct cftype *cft,
|
|
struct seq_file *sf);
|
|
|
|
struct blkg_conf_ctx {
|
|
struct gendisk *disk;
|
|
struct blkio_group *blkg;
|
|
u64 v;
|
|
};
|
|
|
|
int blkg_conf_prep(struct blkio_cgroup *blkcg, const char *input,
|
|
struct blkg_conf_ctx *ctx);
|
|
void blkg_conf_finish(struct blkg_conf_ctx *ctx);
|
|
|
|
|
|
/**
|
|
* blkg_to_pdata - get policy private data
|
|
* @blkg: blkg of interest
|
|
* @pol: policy of interest
|
|
*
|
|
* Return pointer to private data associated with the @blkg-@pol pair.
|
|
*/
|
|
static inline void *blkg_to_pdata(struct blkio_group *blkg,
|
|
struct blkio_policy_type *pol)
|
|
{
|
|
return blkg ? blkg->pd[pol->plid]->pdata : NULL;
|
|
}
|
|
|
|
/**
|
|
* pdata_to_blkg - get blkg associated with policy private data
|
|
* @pdata: policy private data of interest
|
|
*
|
|
* @pdata is policy private data. Determine the blkg it's associated with.
|
|
*/
|
|
static inline struct blkio_group *pdata_to_blkg(void *pdata)
|
|
{
|
|
if (pdata) {
|
|
struct blkg_policy_data *pd =
|
|
container_of(pdata, struct blkg_policy_data, pdata);
|
|
return pd->blkg;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static inline char *blkg_path(struct blkio_group *blkg)
|
|
{
|
|
return blkg->path;
|
|
}
|
|
|
|
/**
|
|
* blkg_get - get a blkg reference
|
|
* @blkg: blkg to get
|
|
*
|
|
* The caller should be holding queue_lock and an existing reference.
|
|
*/
|
|
static inline void blkg_get(struct blkio_group *blkg)
|
|
{
|
|
lockdep_assert_held(blkg->q->queue_lock);
|
|
WARN_ON_ONCE(!blkg->refcnt);
|
|
blkg->refcnt++;
|
|
}
|
|
|
|
void __blkg_release(struct blkio_group *blkg);
|
|
|
|
/**
|
|
* blkg_put - put a blkg reference
|
|
* @blkg: blkg to put
|
|
*
|
|
* The caller should be holding queue_lock.
|
|
*/
|
|
static inline void blkg_put(struct blkio_group *blkg)
|
|
{
|
|
lockdep_assert_held(blkg->q->queue_lock);
|
|
WARN_ON_ONCE(blkg->refcnt <= 0);
|
|
if (!--blkg->refcnt)
|
|
__blkg_release(blkg);
|
|
}
|
|
|
|
/**
|
|
* blkg_stat_add - add a value to a blkg_stat
|
|
* @stat: target blkg_stat
|
|
* @val: value to add
|
|
*
|
|
* Add @val to @stat. The caller is responsible for synchronizing calls to
|
|
* this function.
|
|
*/
|
|
static inline void blkg_stat_add(struct blkg_stat *stat, uint64_t val)
|
|
{
|
|
u64_stats_update_begin(&stat->syncp);
|
|
stat->cnt += val;
|
|
u64_stats_update_end(&stat->syncp);
|
|
}
|
|
|
|
/**
|
|
* blkg_stat_read - read the current value of a blkg_stat
|
|
* @stat: blkg_stat to read
|
|
*
|
|
* Read the current value of @stat. This function can be called without
|
|
* synchroniztion and takes care of u64 atomicity.
|
|
*/
|
|
static inline uint64_t blkg_stat_read(struct blkg_stat *stat)
|
|
{
|
|
unsigned int start;
|
|
uint64_t v;
|
|
|
|
do {
|
|
start = u64_stats_fetch_begin(&stat->syncp);
|
|
v = stat->cnt;
|
|
} while (u64_stats_fetch_retry(&stat->syncp, start));
|
|
|
|
return v;
|
|
}
|
|
|
|
/**
|
|
* blkg_stat_reset - reset a blkg_stat
|
|
* @stat: blkg_stat to reset
|
|
*/
|
|
static inline void blkg_stat_reset(struct blkg_stat *stat)
|
|
{
|
|
stat->cnt = 0;
|
|
}
|
|
|
|
/**
|
|
* blkg_rwstat_add - add a value to a blkg_rwstat
|
|
* @rwstat: target blkg_rwstat
|
|
* @rw: mask of REQ_{WRITE|SYNC}
|
|
* @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,
|
|
int rw, uint64_t val)
|
|
{
|
|
u64_stats_update_begin(&rwstat->syncp);
|
|
|
|
if (rw & REQ_WRITE)
|
|
rwstat->cnt[BLKG_RWSTAT_WRITE] += val;
|
|
else
|
|
rwstat->cnt[BLKG_RWSTAT_READ] += val;
|
|
if (rw & REQ_SYNC)
|
|
rwstat->cnt[BLKG_RWSTAT_SYNC] += val;
|
|
else
|
|
rwstat->cnt[BLKG_RWSTAT_ASYNC] += val;
|
|
|
|
u64_stats_update_end(&rwstat->syncp);
|
|
}
|
|
|
|
/**
|
|
* 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 as the return value.
|
|
* This function can be called without synchronization and takes care of
|
|
* u64 atomicity.
|
|
*/
|
|
static struct blkg_rwstat blkg_rwstat_read(struct blkg_rwstat *rwstat)
|
|
{
|
|
unsigned int start;
|
|
struct blkg_rwstat tmp;
|
|
|
|
do {
|
|
start = u64_stats_fetch_begin(&rwstat->syncp);
|
|
tmp = *rwstat;
|
|
} while (u64_stats_fetch_retry(&rwstat->syncp, start));
|
|
|
|
return tmp;
|
|
}
|
|
|
|
/**
|
|
* blkg_rwstat_sum - 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_sum(struct blkg_rwstat *rwstat)
|
|
{
|
|
struct blkg_rwstat tmp = blkg_rwstat_read(rwstat);
|
|
|
|
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)
|
|
{
|
|
memset(rwstat->cnt, 0, sizeof(rwstat->cnt));
|
|
}
|
|
|
|
#else
|
|
|
|
struct blkio_group {
|
|
};
|
|
|
|
struct blkio_policy_type {
|
|
};
|
|
|
|
static inline int blkcg_init_queue(struct request_queue *q) { return 0; }
|
|
static inline void blkcg_drain_queue(struct request_queue *q) { }
|
|
static inline void blkcg_exit_queue(struct request_queue *q) { }
|
|
static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
|
|
static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
|
|
static inline void blkg_destroy_all(struct request_queue *q,
|
|
bool destory_root) { }
|
|
static inline void update_root_blkg_pd(struct request_queue *q,
|
|
enum blkio_policy_id plid) { }
|
|
|
|
static inline void *blkg_to_pdata(struct blkio_group *blkg,
|
|
struct blkio_policy_type *pol) { return NULL; }
|
|
static inline struct blkio_group *pdata_to_blkg(void *pdata,
|
|
struct blkio_policy_type *pol) { return NULL; }
|
|
static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
|
|
static inline void blkg_get(struct blkio_group *blkg) { }
|
|
static inline void blkg_put(struct blkio_group *blkg) { }
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_BLK_CGROUP
|
|
extern struct blkio_cgroup blkio_root_cgroup;
|
|
extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
|
|
extern struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio);
|
|
extern struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
|
|
struct request_queue *q);
|
|
struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
|
|
struct request_queue *q,
|
|
bool for_root);
|
|
#else
|
|
struct cgroup;
|
|
static inline struct blkio_cgroup *
|
|
cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
|
|
static inline struct blkio_cgroup *
|
|
bio_blkio_cgroup(struct bio *bio) { return NULL; }
|
|
|
|
static inline struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
|
|
void *key) { return NULL; }
|
|
#endif
|
|
#endif /* _BLK_CGROUP_H */
|