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sched: Add put_prev_task(.next)

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In order to tell the previous sched_class what the next task is, add
put_prev_task(.next).

Notable SCX will use this to:

 1) determine the next task will leave the SCX sched class and push
    the current task to another CPU if possible.
 2) statistics on how often and which other classes preempt it

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240813224016.367421076@infradead.org
This commit is contained in:
Peter Zijlstra 2024-08-14 00:25:56 +02:00
parent bd9bbc96e8
commit b2d70222db
6 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/sched/deadline.c
View File

@ -2436,7 +2436,7 @@ static struct task_struct *pick_task_dl(struct rq *rq)
return __pick_task_dl(rq);
}
static void put_prev_task_dl(struct rq *rq, struct task_struct *p)
static void put_prev_task_dl(struct rq *rq, struct task_struct *p, struct task_struct *next)
{
struct sched_dl_entity *dl_se = &p->dl;
struct dl_rq *dl_rq = &rq->dl;

2
kernel/sched/fair.c
View File

@ -8869,7 +8869,7 @@ void fair_server_init(struct rq *rq)
/*
* Account for a descheduled task:
*/
static void put_prev_task_fair(struct rq *rq, struct task_struct *prev)
static void put_prev_task_fair(struct rq *rq, struct task_struct *prev, struct task_struct *next)
{
struct sched_entity *se = &prev->se;
struct cfs_rq *cfs_rq;

2
kernel/sched/idle.c
View File

@ -450,7 +450,7 @@ static void wakeup_preempt_idle(struct rq *rq, struct task_struct *p, int flags)
resched_curr(rq);
}
static void put_prev_task_idle(struct rq *rq, struct task_struct *prev)
static void put_prev_task_idle(struct rq *rq, struct task_struct *prev, struct task_struct *next)
{
dl_server_update_idle_time(rq, prev);
}

2
kernel/sched/rt.c
View File

@ -1748,7 +1748,7 @@ static struct task_struct *pick_task_rt(struct rq *rq)
return p;
}
static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
static void put_prev_task_rt(struct rq *rq, struct task_struct *p, struct task_struct *next)
{
struct sched_rt_entity *rt_se = &p->rt;
struct rt_rq *rt_rq = &rq->rt;

6
kernel/sched/sched.h
View File

@ -2314,7 +2314,7 @@ struct sched_class {
*/
struct task_struct *(*pick_next_task)(struct rq *rq, struct task_struct *prev);
void (*put_prev_task)(struct rq *rq, struct task_struct *p);
void (*put_prev_task)(struct rq *rq, struct task_struct *p, struct task_struct *next);
void (*set_next_task)(struct rq *rq, struct task_struct *p, bool first);
#ifdef CONFIG_SMP
@ -2364,7 +2364,7 @@ struct sched_class {
static inline void put_prev_task(struct rq *rq, struct task_struct *prev)
{
WARN_ON_ONCE(rq->curr != prev);
prev->sched_class->put_prev_task(rq, prev);
prev->sched_class->put_prev_task(rq, prev, NULL);
}
static inline void set_next_task(struct rq *rq, struct task_struct *next)
@ -2393,7 +2393,7 @@ static inline void put_prev_set_next_task(struct rq *rq,
if (next == prev)
return;
prev->sched_class->put_prev_task(rq, prev);
prev->sched_class->put_prev_task(rq, prev, next);
next->sched_class->set_next_task(rq, next, true);
}

2
kernel/sched/stop_task.c
View File

@ -59,7 +59,7 @@ static void yield_task_stop(struct rq *rq)
BUG(); /* the stop task should never yield, its pointless. */
}
static void put_prev_task_stop(struct rq *rq, struct task_struct *prev)
static void put_prev_task_stop(struct rq *rq, struct task_struct *prev, struct task_struct *next)
{
update_curr_common(rq);
}