/*
* Deadline Scheduling Class (SCHED_DEADLINE)
*
* Earliest Deadline First (EDF) + Constant Bandwidth Server (CBS).
*
* Tasks that periodically executes their instances for less than their
* runtime won't miss any of their deadlines.
* Tasks that are not periodic or sporadic or that tries to execute more
* than their reserved bandwidth will be slowed down (and may potentially
* miss some of their deadlines), and won't affect any other task.
*
* Copyright (C) 2012 Dario Faggioli <raistlin@linux.it>,
* Juri Lelli <juri.lelli@gmail.com>,
* Michael Trimarchi <michael@amarulasolutions.com>,
* Fabio Checconi <fchecconi@gmail.com>
*/
#include "sched.h"
#include <linux/slab.h>
struct dl_bandwidth def_dl_bandwidth;
static inline struct task_struct *dl_task_of(struct sched_dl_entity *dl_se)
{
return container_of(dl_se, struct task_struct, dl);
}
static inline struct rq *rq_of_dl_rq(struct dl_rq *dl_rq)
{
return container_of(dl_rq, struct rq, dl);
}
static inline struct dl_rq *dl_rq_of_se(struct sched_dl_entity *dl_se)
{
struct task_struct *p = dl_task_of(dl_se);
struct rq *rq = task_rq(p);
return &rq->dl;
}
static inline int on_dl_rq(struct sched_dl_entity *dl_se)
{
return !RB_EMPTY_NODE(&dl_se->rb_node);
}
static inline int is_leftmost(struct task_struct *p, struct dl_rq *dl_rq)
{
struct sched_dl_entity *dl_se = &p->dl;
return dl_rq->rb_leftmost == &dl_se->rb_node;
}
void init_dl_bandwidth(struct dl_bandwidth *dl_b, u64 period, u64 runtime)
{
raw_spin_lock_init(&dl_b->dl_runtime_lock);
dl_b->dl_period = period;
dl_b->dl_runtime = runtime;
}
extern unsigned long to_ratio(u64 period, u64 runtime);
void init_dl_bw(struct dl_bw *dl_b)
{
raw_spin_lock_init(&dl_b->lock);
raw_spin_lock(&def_dl_bandwidth.dl_runtime_lock);
if (global_rt_runtime() == RUNTIME_INF)
dl_b->bw = -1;
else
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