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sched_ext: Add @sch to SCX_CALL_OP*()

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In preparation of hierarchical scheduling support, make SCX_CALL_OP*() take
explicit @sch instead of assuming scx_root. As scx_root is still the only
scheduler instance, this patch doesn't make any functional changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
This commit is contained in:
Tejun Heo
2025-05-14 11:11:48 -04:00
parent d310fb4009
commit ab3f497ac1
2 changed files with 75 additions and 59 deletions
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132
kernel/sched/ext.c
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@@ -1241,30 +1241,30 @@ static inline struct rq *scx_locked_rq(void)
return __this_cpu_read(locked_rq);
}
#define SCX_CALL_OP(mask, op, rq, args...) \
#define SCX_CALL_OP(sch, mask, op, rq, args...) \
do { \
update_locked_rq(rq); \
if (mask) { \
scx_kf_allow(mask); \
scx_root->ops.op(args); \
(sch)->ops.op(args); \
scx_kf_disallow(mask); \
} else { \
scx_root->ops.op(args); \
(sch)->ops.op(args); \
} \
update_locked_rq(NULL); \
} while (0)
#define SCX_CALL_OP_RET(mask, op, rq, args...) \
#define SCX_CALL_OP_RET(sch, mask, op, rq, args...) \
({ \
__typeof__(scx_root->ops.op(args)) __ret; \
__typeof__((sch)->ops.op(args)) __ret; \
\
update_locked_rq(rq); \
if (mask) { \
scx_kf_allow(mask); \
__ret = scx_root->ops.op(args); \
__ret = (sch)->ops.op(args); \
scx_kf_disallow(mask); \
} else { \
__ret = scx_root->ops.op(args); \
__ret = (sch)->ops.op(args); \
} \
update_locked_rq(NULL); \
__ret; \
@@ -1281,31 +1281,31 @@ do { \
* scx_kf_allowed_on_arg_tasks() to test whether the invocation is allowed on
* the specific task.
*/
#define SCX_CALL_OP_TASK(mask, op, rq, task, args...) \
#define SCX_CALL_OP_TASK(sch, mask, op, rq, task, args...) \
do { \
BUILD_BUG_ON((mask) & ~__SCX_KF_TERMINAL); \
current->scx.kf_tasks[0] = task; \
SCX_CALL_OP(mask, op, rq, task, ##args); \
SCX_CALL_OP((sch), mask, op, rq, task, ##args); \
current->scx.kf_tasks[0] = NULL; \
} while (0)
#define SCX_CALL_OP_TASK_RET(mask, op, rq, task, args...) \
#define SCX_CALL_OP_TASK_RET(sch, mask, op, rq, task, args...) \
({ \
__typeof__(scx_root->ops.op(task, ##args)) __ret; \
__typeof__((sch)->ops.op(task, ##args)) __ret; \
BUILD_BUG_ON((mask) & ~__SCX_KF_TERMINAL); \
current->scx.kf_tasks[0] = task; \
__ret = SCX_CALL_OP_RET(mask, op, rq, task, ##args); \
__ret = SCX_CALL_OP_RET((sch), mask, op, rq, task, ##args); \
current->scx.kf_tasks[0] = NULL; \
__ret; \
})
#define SCX_CALL_OP_2TASKS_RET(mask, op, rq, task0, task1, args...) \
#define SCX_CALL_OP_2TASKS_RET(sch, mask, op, rq, task0, task1, args...) \
({ \
__typeof__(scx_root->ops.op(task0, task1, ##args)) __ret; \
__typeof__((sch)->ops.op(task0, task1, ##args)) __ret; \
BUILD_BUG_ON((mask) & ~__SCX_KF_TERMINAL); \
current->scx.kf_tasks[0] = task0; \
current->scx.kf_tasks[1] = task1; \
__ret = SCX_CALL_OP_RET(mask, op, rq, task0, task1, ##args); \
__ret = SCX_CALL_OP_RET((sch), mask, op, rq, task0, task1, ##args); \
current->scx.kf_tasks[0] = NULL; \
current->scx.kf_tasks[1] = NULL; \
__ret; \
@@ -2246,7 +2246,7 @@ static void do_enqueue_task(struct rq *rq, struct task_struct *p, u64 enq_flags,
WARN_ON_ONCE(*ddsp_taskp);
*ddsp_taskp = p;
SCX_CALL_OP_TASK(SCX_KF_ENQUEUE, enqueue, rq, p, enq_flags);
SCX_CALL_OP_TASK(sch, SCX_KF_ENQUEUE, enqueue, rq, p, enq_flags);
*ddsp_taskp = NULL;
if (p->scx.ddsp_dsq_id != SCX_DSQ_INVALID)
@@ -2342,7 +2342,7 @@ static void enqueue_task_scx(struct rq *rq, struct task_struct *p, int enq_flags
add_nr_running(rq, 1);
if (SCX_HAS_OP(sch, runnable) && !task_on_rq_migrating(p))
SCX_CALL_OP_TASK(SCX_KF_REST, runnable, rq, p, enq_flags);
SCX_CALL_OP_TASK(sch, SCX_KF_REST, runnable, rq, p, enq_flags);
if (enq_flags & SCX_ENQ_WAKEUP)
touch_core_sched(rq, p);
@@ -2378,7 +2378,8 @@ static void ops_dequeue(struct rq *rq, struct task_struct *p, u64 deq_flags)
BUG();
case SCX_OPSS_QUEUED:
if (SCX_HAS_OP(sch, dequeue))
SCX_CALL_OP_TASK(SCX_KF_REST, dequeue, rq, p, deq_flags);
SCX_CALL_OP_TASK(sch, SCX_KF_REST, dequeue, rq,
p, deq_flags);
if (atomic_long_try_cmpxchg(&p->scx.ops_state, &opss,
SCX_OPSS_NONE))
@@ -2429,11 +2430,11 @@ static bool dequeue_task_scx(struct rq *rq, struct task_struct *p, int deq_flags
*/
if (SCX_HAS_OP(sch, stopping) && task_current(rq, p)) {
update_curr_scx(rq);
SCX_CALL_OP_TASK(SCX_KF_REST, stopping, rq, p, false);
SCX_CALL_OP_TASK(sch, SCX_KF_REST, stopping, rq, p, false);
}
if (SCX_HAS_OP(sch, quiescent) && !task_on_rq_migrating(p))
SCX_CALL_OP_TASK(SCX_KF_REST, quiescent, rq, p, deq_flags);
SCX_CALL_OP_TASK(sch, SCX_KF_REST, quiescent, rq, p, deq_flags);
if (deq_flags & SCX_DEQ_SLEEP)
p->scx.flags |= SCX_TASK_DEQD_FOR_SLEEP;
@@ -2454,7 +2455,7 @@ static void yield_task_scx(struct rq *rq)
struct task_struct *p = rq->curr;
if (SCX_HAS_OP(sch, yield))
SCX_CALL_OP_2TASKS_RET(SCX_KF_REST, yield, rq, p, NULL);
SCX_CALL_OP_2TASKS_RET(sch, SCX_KF_REST, yield, rq, p, NULL);
else
p->scx.slice = 0;
}
@@ -2465,7 +2466,8 @@ static bool yield_to_task_scx(struct rq *rq, struct task_struct *to)
struct task_struct *from = rq->curr;
if (SCX_HAS_OP(sch, yield))
return SCX_CALL_OP_2TASKS_RET(SCX_KF_REST, yield, rq, from, to);
return SCX_CALL_OP_2TASKS_RET(sch, SCX_KF_REST, yield, rq,
from, to);
else
return false;
}
@@ -3026,7 +3028,8 @@ static int balance_one(struct rq *rq, struct task_struct *prev)
* emitted in switch_class().
*/
if (SCX_HAS_OP(sch, cpu_acquire))
SCX_CALL_OP(SCX_KF_REST, cpu_acquire, rq, cpu_of(rq), NULL);
SCX_CALL_OP(sch, SCX_KF_REST, cpu_acquire, rq,
cpu_of(rq), NULL);
rq->scx.cpu_released = false;
}
@@ -3072,8 +3075,8 @@ static int balance_one(struct rq *rq, struct task_struct *prev)
do {
dspc->nr_tasks = 0;
SCX_CALL_OP(SCX_KF_DISPATCH, dispatch, rq, cpu_of(rq),
prev_on_scx ? prev : NULL);
SCX_CALL_OP(sch, SCX_KF_DISPATCH, dispatch, rq,
cpu_of(rq), prev_on_scx ? prev : NULL);
flush_dispatch_buf(sch, rq);
@@ -3197,7 +3200,7 @@ static void set_next_task_scx(struct rq *rq, struct task_struct *p, bool first)
/* see dequeue_task_scx() on why we skip when !QUEUED */
if (SCX_HAS_OP(sch, running) && (p->scx.flags & SCX_TASK_QUEUED))
SCX_CALL_OP_TASK(SCX_KF_REST, running, rq, p);
SCX_CALL_OP_TASK(sch, SCX_KF_REST, running, rq, p);
clr_task_runnable(p, true);
@@ -3279,7 +3282,8 @@ static void switch_class(struct rq *rq, struct task_struct *next)
.task = next,
};
SCX_CALL_OP(SCX_KF_CPU_RELEASE, cpu_release, rq, cpu_of(rq), &args);
SCX_CALL_OP(sch, SCX_KF_CPU_RELEASE, cpu_release, rq,
cpu_of(rq), &args);
}
rq->scx.cpu_released = true;
}
@@ -3293,7 +3297,7 @@ static void put_prev_task_scx(struct rq *rq, struct task_struct *p,
/* see dequeue_task_scx() on why we skip when !QUEUED */
if (SCX_HAS_OP(sch, stopping) && (p->scx.flags & SCX_TASK_QUEUED))
SCX_CALL_OP_TASK(SCX_KF_REST, stopping, rq, p, true);
SCX_CALL_OP_TASK(sch, SCX_KF_REST, stopping, rq, p, true);
if (p->scx.flags & SCX_TASK_QUEUED) {
set_task_runnable(rq, p);
@@ -3436,7 +3440,8 @@ bool scx_prio_less(const struct task_struct *a, const struct task_struct *b,
*/
if (SCX_HAS_OP(sch, core_sched_before) &&
!scx_rq_bypassing(task_rq(a)))
return SCX_CALL_OP_2TASKS_RET(SCX_KF_REST, core_sched_before, NULL,
return SCX_CALL_OP_2TASKS_RET(sch, SCX_KF_REST, core_sched_before,
NULL,
(struct task_struct *)a,
(struct task_struct *)b);
else
@@ -3473,8 +3478,10 @@ static int select_task_rq_scx(struct task_struct *p, int prev_cpu, int wake_flag
WARN_ON_ONCE(*ddsp_taskp);
*ddsp_taskp = p;
cpu = SCX_CALL_OP_TASK_RET(SCX_KF_ENQUEUE | SCX_KF_SELECT_CPU,
select_cpu, NULL, p, prev_cpu, wake_flags);
cpu = SCX_CALL_OP_TASK_RET(sch,
SCX_KF_ENQUEUE | SCX_KF_SELECT_CPU,
select_cpu, NULL, p, prev_cpu,
wake_flags);
p->scx.selected_cpu = cpu;
*ddsp_taskp = NULL;
if (ops_cpu_valid(cpu, "from ops.select_cpu()"))
@@ -3520,7 +3527,7 @@ static void set_cpus_allowed_scx(struct task_struct *p,
* designation pointless. Cast it away when calling the operation.
*/
if (SCX_HAS_OP(sch, set_cpumask))
SCX_CALL_OP_TASK(SCX_KF_REST, set_cpumask, NULL,
SCX_CALL_OP_TASK(sch, SCX_KF_REST, set_cpumask, NULL,
p, (struct cpumask *)p->cpus_ptr);
}
@@ -3543,9 +3550,9 @@ static void handle_hotplug(struct rq *rq, bool online)
scx_idle_update_selcpu_topology(&sch->ops);
if (online && SCX_HAS_OP(sch, cpu_online))
SCX_CALL_OP(SCX_KF_UNLOCKED, cpu_online, NULL, cpu);
SCX_CALL_OP(sch, SCX_KF_UNLOCKED, cpu_online, NULL, cpu);
else if (!online && SCX_HAS_OP(sch, cpu_offline))
SCX_CALL_OP(SCX_KF_UNLOCKED, cpu_offline, NULL, cpu);
SCX_CALL_OP(sch, SCX_KF_UNLOCKED, cpu_offline, NULL, cpu);
else
scx_exit(SCX_ECODE_ACT_RESTART | SCX_ECODE_RSN_HOTPLUG,
"cpu %d going %s, exiting scheduler", cpu,
@@ -3650,7 +3657,7 @@ static void task_tick_scx(struct rq *rq, struct task_struct *curr, int queued)
curr->scx.slice = 0;
touch_core_sched(rq, curr);
} else if (SCX_HAS_OP(sch, tick)) {
SCX_CALL_OP_TASK(SCX_KF_REST, tick, rq, curr);
SCX_CALL_OP_TASK(sch, SCX_KF_REST, tick, rq, curr);
}
if (!curr->scx.slice)
@@ -3728,7 +3735,8 @@ static int scx_init_task(struct task_struct *p, struct task_group *tg, bool fork
.fork = fork,
};
ret = SCX_CALL_OP_RET(SCX_KF_UNLOCKED, init_task, NULL, p, &args);
ret = SCX_CALL_OP_RET(sch, SCX_KF_UNLOCKED, init_task, NULL,
p, &args);
if (unlikely(ret)) {
ret = ops_sanitize_err("init_task", ret);
return ret;
@@ -3787,11 +3795,12 @@ static void scx_enable_task(struct task_struct *p)
p->scx.weight = sched_weight_to_cgroup(weight);
if (SCX_HAS_OP(sch, enable))
SCX_CALL_OP_TASK(SCX_KF_REST, enable, rq, p);
SCX_CALL_OP_TASK(sch, SCX_KF_REST, enable, rq, p);
scx_set_task_state(p, SCX_TASK_ENABLED);
if (SCX_HAS_OP(sch, set_weight))
SCX_CALL_OP_TASK(SCX_KF_REST, set_weight, rq, p, p->scx.weight);
SCX_CALL_OP_TASK(sch, SCX_KF_REST, set_weight, rq,
p, p->scx.weight);
}
static void scx_disable_task(struct task_struct *p)
@@ -3803,7 +3812,7 @@ static void scx_disable_task(struct task_struct *p)
WARN_ON_ONCE(scx_get_task_state(p) != SCX_TASK_ENABLED);
if (SCX_HAS_OP(sch, disable))
SCX_CALL_OP_TASK(SCX_KF_REST, disable, rq, p);
SCX_CALL_OP_TASK(sch, SCX_KF_REST, disable, rq, p);
scx_set_task_state(p, SCX_TASK_READY);
}
@@ -3833,7 +3842,8 @@ static void scx_exit_task(struct task_struct *p)
}
if (SCX_HAS_OP(sch, exit_task))
SCX_CALL_OP_TASK(SCX_KF_REST, exit_task, task_rq(p), p, &args);
SCX_CALL_OP_TASK(sch, SCX_KF_REST, exit_task, task_rq(p),
p, &args);
scx_set_task_state(p, SCX_TASK_NONE);
}
@@ -3944,7 +3954,8 @@ static void reweight_task_scx(struct rq *rq, struct task_struct *p,
p->scx.weight = sched_weight_to_cgroup(scale_load_down(lw->weight));
if (SCX_HAS_OP(sch, set_weight))
SCX_CALL_OP_TASK(SCX_KF_REST, set_weight, rq, p, p->scx.weight);
SCX_CALL_OP_TASK(sch, SCX_KF_REST, set_weight, rq,
p, p->scx.weight);
}
static void prio_changed_scx(struct rq *rq, struct task_struct *p, int oldprio)
@@ -3962,7 +3973,7 @@ static void switching_to_scx(struct rq *rq, struct task_struct *p)
* different scheduler class. Keep the BPF scheduler up-to-date.
*/
if (SCX_HAS_OP(sch, set_cpumask))
SCX_CALL_OP_TASK(SCX_KF_REST, set_cpumask, rq,
SCX_CALL_OP_TASK(sch, SCX_KF_REST, set_cpumask, rq,
p, (struct cpumask *)p->cpus_ptr);
}
@@ -4025,8 +4036,8 @@ int scx_tg_online(struct task_group *tg)
struct scx_cgroup_init_args args =
{ .weight = tg->scx_weight };
ret = SCX_CALL_OP_RET(SCX_KF_UNLOCKED, cgroup_init, NULL,
tg->css.cgroup, &args);
ret = SCX_CALL_OP_RET(sch, SCX_KF_UNLOCKED, cgroup_init,
NULL, tg->css.cgroup, &args);
if (ret)
ret = ops_sanitize_err("cgroup_init", ret);
}
@@ -4050,7 +4061,8 @@ void scx_tg_offline(struct task_group *tg)
if (scx_cgroup_enabled && SCX_HAS_OP(sch, cgroup_exit) &&
(tg->scx_flags & SCX_TG_INITED))
SCX_CALL_OP(SCX_KF_UNLOCKED, cgroup_exit, NULL, tg->css.cgroup);
SCX_CALL_OP(sch, SCX_KF_UNLOCKED, cgroup_exit, NULL,
tg->css.cgroup);
tg->scx_flags &= ~(SCX_TG_ONLINE | SCX_TG_INITED);
percpu_up_read(&scx_cgroup_rwsem);
@@ -4084,7 +4096,8 @@ int scx_cgroup_can_attach(struct cgroup_taskset *tset)
continue;
if (SCX_HAS_OP(sch, cgroup_prep_move)) {
ret = SCX_CALL_OP_RET(SCX_KF_UNLOCKED, cgroup_prep_move, NULL,
ret = SCX_CALL_OP_RET(sch, SCX_KF_UNLOCKED,
cgroup_prep_move, NULL,
p, from, css->cgroup);
if (ret)
goto err;
@@ -4099,7 +4112,7 @@ err:
cgroup_taskset_for_each(p, css, tset) {
if (SCX_HAS_OP(sch, cgroup_cancel_move) &&
p->scx.cgrp_moving_from)
SCX_CALL_OP(SCX_KF_UNLOCKED, cgroup_cancel_move, NULL,
SCX_CALL_OP(sch, SCX_KF_UNLOCKED, cgroup_cancel_move, NULL,
p, p->scx.cgrp_moving_from, css->cgroup);
p->scx.cgrp_moving_from = NULL;
}
@@ -4121,8 +4134,9 @@ void scx_cgroup_move_task(struct task_struct *p)
*/
if (SCX_HAS_OP(sch, cgroup_move) &&
!WARN_ON_ONCE(!p->scx.cgrp_moving_from))
SCX_CALL_OP_TASK(SCX_KF_UNLOCKED, cgroup_move, NULL,
p, p->scx.cgrp_moving_from, tg_cgrp(task_group(p)));
SCX_CALL_OP_TASK(sch, SCX_KF_UNLOCKED, cgroup_move, NULL,
p, p->scx.cgrp_moving_from,
tg_cgrp(task_group(p)));
p->scx.cgrp_moving_from = NULL;
}
@@ -4143,7 +4157,7 @@ void scx_cgroup_cancel_attach(struct cgroup_taskset *tset)
cgroup_taskset_for_each(p, css, tset) {
if (SCX_HAS_OP(sch, cgroup_cancel_move) &&
p->scx.cgrp_moving_from)
SCX_CALL_OP(SCX_KF_UNLOCKED, cgroup_cancel_move, NULL,
SCX_CALL_OP(sch, SCX_KF_UNLOCKED, cgroup_cancel_move, NULL,
p, p->scx.cgrp_moving_from, css->cgroup);
p->scx.cgrp_moving_from = NULL;
}
@@ -4159,7 +4173,7 @@ void scx_group_set_weight(struct task_group *tg, unsigned long weight)
if (scx_cgroup_enabled && tg->scx_weight != weight) {
if (SCX_HAS_OP(sch, cgroup_set_weight))
SCX_CALL_OP(SCX_KF_UNLOCKED, cgroup_set_weight, NULL,
SCX_CALL_OP(sch, SCX_KF_UNLOCKED, cgroup_set_weight, NULL,
tg_cgrp(tg), weight);
tg->scx_weight = weight;
}
@@ -4326,7 +4340,8 @@ static void scx_cgroup_exit(struct scx_sched *sch)
continue;
rcu_read_unlock();
SCX_CALL_OP(SCX_KF_UNLOCKED, cgroup_exit, NULL, css->cgroup);
SCX_CALL_OP(sch, SCX_KF_UNLOCKED, cgroup_exit, NULL,
css->cgroup);
rcu_read_lock();
css_put(css);
@@ -4363,7 +4378,7 @@ static int scx_cgroup_init(struct scx_sched *sch)
continue;
rcu_read_unlock();
ret = SCX_CALL_OP_RET(SCX_KF_UNLOCKED, cgroup_init, NULL,
ret = SCX_CALL_OP_RET(sch, SCX_KF_UNLOCKED, cgroup_init, NULL,
css->cgroup, &args);
if (ret) {
css_put(css);
@@ -4892,7 +4907,7 @@ static void scx_disable_workfn(struct kthread_work *work)
}
if (sch->ops.exit)
SCX_CALL_OP(SCX_KF_UNLOCKED, exit, NULL, ei);
SCX_CALL_OP(sch, SCX_KF_UNLOCKED, exit, NULL, ei);
cancel_delayed_work_sync(&scx_watchdog_work);
@@ -5079,7 +5094,7 @@ static void scx_dump_task(struct seq_buf *s, struct scx_dump_ctx *dctx,
if (SCX_HAS_OP(sch, dump_task)) {
ops_dump_init(s, " ");
SCX_CALL_OP(SCX_KF_REST, dump_task, NULL, dctx, p);
SCX_CALL_OP(sch, SCX_KF_REST, dump_task, NULL, dctx, p);
ops_dump_exit();
}
@@ -5127,7 +5142,7 @@ static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len)
if (SCX_HAS_OP(sch, dump)) {
ops_dump_init(&s, "");
SCX_CALL_OP(SCX_KF_UNLOCKED, dump, NULL, &dctx);
SCX_CALL_OP(sch, SCX_KF_UNLOCKED, dump, NULL, &dctx);
ops_dump_exit();
}
@@ -5184,7 +5199,8 @@ static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len)
used = seq_buf_used(&ns);
if (SCX_HAS_OP(sch, dump_cpu)) {
ops_dump_init(&ns, " ");
SCX_CALL_OP(SCX_KF_REST, dump_cpu, NULL, &dctx, cpu, idle);
SCX_CALL_OP(sch, SCX_KF_REST, dump_cpu, NULL,
&dctx, cpu, idle);
ops_dump_exit();
}
@@ -5463,7 +5479,7 @@ static int scx_enable(struct sched_ext_ops *ops, struct bpf_link *link)
scx_idle_enable(ops);
if (sch->ops.init) {
ret = SCX_CALL_OP_RET(SCX_KF_UNLOCKED, init, NULL);
ret = SCX_CALL_OP_RET(sch, SCX_KF_UNLOCKED, init, NULL);
if (ret) {
ret = ops_sanitize_err("init", ret);
cpus_read_unlock();