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Add support for handling these transitions. Moreover, remove references specific to the fair server, in preparation for adding the ext server. v2: - wait for inactive_task_timer to fire before removing the bandwidth reservation (Juri Lelli) - add WARN_ON_ONCE(!cpus) sanity check in dl_server_apply_params() (Andrea Righi) Co-developed-by: Joel Fernandes Signed-off-by: Joel Fernandes Signed-off-by: Andrea Righi --- kernel/sched/deadline.c | 96 ++++++++++++++++++++++++++++++++++------- kernel/sched/sched.h | 3 ++ 2 files changed, 84 insertions(+), 15 deletions(-) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 4aefb34a1d38b..8aff1aba7b8a9 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -1441,8 +1441,8 @@ static void update_curr_dl_se(struct rq *rq, struct sched_dl_entity *dl_se, s64 dl_se->runtime -= scaled_delta_exec; /* - * The fair server can consume its runtime while throttled (not queued/ - * running as regular CFS). + * The dl_server can consume its runtime while throttled (not + * queued / running as regular fair task). * * If the server consumes its entire runtime in this state. The server * is not required for the current period. Thus, reset the server by @@ -1501,10 +1501,10 @@ static void update_curr_dl_se(struct rq *rq, struct sched_dl_entity *dl_se, s64 } /* - * The fair server (sole dl_server) does not account for real-time - * workload because it is running fair work. + * The dl_server does not account real-time workload because it + * runs non-RT tasks. */ - if (dl_se == &rq->fair_server) + if (dl_se->dl_server) return; #ifdef CONFIG_RT_GROUP_SCHED @@ -1540,8 +1540,8 @@ static void update_curr_dl_se(struct rq *rq, struct sched_dl_entity *dl_se, s64 * server provides a guarantee. * * If the dl_server is in defer mode, the idle time is also considered - * as time available for the fair server, avoiding a penalty for the - * rt scheduler that did not consumed that time. + * as time available for the dl_server, avoiding a penalty for the rt + * scheduler that did not consumed that time. */ void dl_server_update_idle_time(struct rq *rq, struct task_struct *p) { @@ -1570,11 +1570,37 @@ void dl_server_update_idle_time(struct rq *rq, struct task_struct *p) void dl_server_update(struct sched_dl_entity *dl_se, s64 delta_exec) { - /* 0 runtime = fair server disabled */ + /* 0 runtime = dl_server disabled */ if (dl_se->dl_runtime) update_curr_dl_se(dl_se->rq, dl_se, delta_exec); } +/** + * dl_server_init_params - Initialize bandwidth reservation for a DL server + * @dl_se: The DL server entity to remove bandwidth for + * + * This function initializes the bandwidth reservation for a DL server + * entity, its bandwidth accounting and server state. + * + * Returns: 0 on success, negative error code on failure + */ +int dl_server_init_params(struct sched_dl_entity *dl_se) +{ + u64 runtime = 50 * NSEC_PER_MSEC; + u64 period = 1000 * NSEC_PER_MSEC; + int err; + + err = dl_server_apply_params(dl_se, runtime, period, 1); + if (err) + return err; + + dl_se->dl_server = 1; + dl_se->dl_defer = 1; + setup_new_dl_entity(dl_se); + + return err; +} + void dl_server_start(struct sched_dl_entity *dl_se) { struct rq *rq = dl_se->rq; @@ -1614,8 +1640,7 @@ void sched_init_dl_servers(void) struct sched_dl_entity *dl_se; for_each_online_cpu(cpu) { - u64 runtime = 50 * NSEC_PER_MSEC; - u64 period = 1000 * NSEC_PER_MSEC; + int err; rq = cpu_rq(cpu); @@ -1625,11 +1650,8 @@ void sched_init_dl_servers(void) WARN_ON(dl_server(dl_se)); - dl_server_apply_params(dl_se, runtime, period, 1); - - dl_se->dl_server = 1; - dl_se->dl_defer = 1; - setup_new_dl_entity(dl_se); + err = dl_server_init_params(dl_se); + WARN_ON_ONCE(err); } } @@ -1663,6 +1685,9 @@ int dl_server_apply_params(struct sched_dl_entity *dl_se, u64 runtime, u64 perio guard(raw_spinlock)(&dl_b->lock); cpus = dl_bw_cpus(cpu); + if (WARN_ON_ONCE(!cpus)) + return -ENODEV; + cap = dl_bw_capacity(cpu); if (__dl_overflow(dl_b, cap, old_bw, new_bw)) @@ -1678,6 +1703,12 @@ int dl_server_apply_params(struct sched_dl_entity *dl_se, u64 runtime, u64 perio dl_rq_change_utilization(rq, dl_se, new_bw); } + /* Clear these so that the dl_server is reinitialized */ + if (new_bw == 0) { + dl_se->dl_defer = 0; + dl_se->dl_server = 0; + } + dl_se->dl_runtime = runtime; dl_se->dl_deadline = period; dl_se->dl_period = period; @@ -1691,6 +1722,41 @@ int dl_server_apply_params(struct sched_dl_entity *dl_se, u64 runtime, u64 perio return retval; } +/** + * dl_server_remove_params - Remove bandwidth reservation for a DL server + * @dl_se: The DL server entity to remove bandwidth for + * + * This function removes the bandwidth reservation for a DL server entity, + * cleaning up all bandwidth accounting and server state. + * + * Returns: 0 on success, negative error code on failure + */ +int dl_server_remove_params(struct sched_dl_entity *dl_se, + struct rq *rq, struct rq_flags *rf) +{ + if (!dl_se->dl_server) + return 0; /* Already disabled */ + + /* + * First dequeue if still queued. It should not be queued since + * we call this only after the last dl_server_stop(). + */ + if (WARN_ON_ONCE(on_dl_rq(dl_se))) + dequeue_dl_entity(dl_se, DEQUEUE_SLEEP); + + if (hrtimer_try_to_cancel(&dl_se->inactive_timer) == -1) { + rq_unlock_irqrestore(rq, rf); + + hrtimer_cancel(&dl_se->inactive_timer); + + rq_lock_irqsave(rq, rf); + update_rq_clock(rq); + } + + /* Remove bandwidth reservation */ + return dl_server_apply_params(dl_se, 0, dl_se->dl_period, false); +} + /* * Update the current task's runtime statistics (provided it is still * a -deadline task and has not been removed from the dl_rq). diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 27aae2a298f8b..4a0bf38dc71e9 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -417,6 +417,9 @@ extern void fair_server_init(struct rq *rq); extern void __dl_server_attach_root(struct sched_dl_entity *dl_se, struct rq *rq); extern int dl_server_apply_params(struct sched_dl_entity *dl_se, u64 runtime, u64 period, bool init); +extern int dl_server_init_params(struct sched_dl_entity *dl_se); +extern int dl_server_remove_params(struct sched_dl_entity *dl_se, + struct rq *rq, struct rq_flags *rf); static inline bool dl_server_active(struct sched_dl_entity *dl_se) { -- 2.51.2