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sched_ext: Count SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE in the right spot

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SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE wasn't quite right in two aspects:

- It counted both migration disabled and offline events.

- It didn't count events from scx_bpf_dsq_move() path.

Fix it by moving the counting into task_can_run_on_remote_rq() which is
shared by both paths and can distinguish the different rejection conditions.
The argument @trigger_error is renamed to @enforce as it now does more than
just triggering error.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Changwoo Min <changwoo@igalia.com>
This commit is contained in:
Tejun Heo 2025-02-08 20:39:11 -10:00
parent 46a0e16158
commit 26176116d9
1 changed files with 7 additions and 5 deletions
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12
kernel/sched/ext.c
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@ -2431,7 +2431,7 @@ static void move_remote_task_to_local_dsq(struct task_struct *p, u64 enq_flags,
* The caller must ensure that @p and @rq are on different CPUs.
*/
static bool task_can_run_on_remote_rq(struct task_struct *p, struct rq *rq,
bool trigger_error)
bool enforce)
{
int cpu = cpu_of(rq);
@ -2444,7 +2444,7 @@ static bool task_can_run_on_remote_rq(struct task_struct *p, struct rq *rq,
* picked CPU is outside the allowed mask.
*/
if (!task_allowed_on_cpu(p, cpu)) {
if (trigger_error)
if (enforce)
scx_ops_error("SCX_DSQ_LOCAL[_ON] verdict target cpu %d not allowed for %s[%d]",
cpu_of(rq), p->comm, p->pid);
return false;
@ -2456,8 +2456,11 @@ static bool task_can_run_on_remote_rq(struct task_struct *p, struct rq *rq,
*/
SCHED_WARN_ON(is_migration_disabled(p));
if (!scx_rq_online(rq))
if (!scx_rq_online(rq)) {
if (enforce)
__scx_add_event(SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE, 1);
return false;
}
return true;
}
@ -2527,7 +2530,7 @@ static bool consume_remote_task(struct rq *this_rq, struct task_struct *p,
}
#else /* CONFIG_SMP */
static inline void move_remote_task_to_local_dsq(struct task_struct *p, u64 enq_flags, struct rq *src_rq, struct rq *dst_rq) { WARN_ON_ONCE(1); }
static inline bool task_can_run_on_remote_rq(struct task_struct *p, struct rq *rq, bool trigger_error) { return false; }
static inline bool task_can_run_on_remote_rq(struct task_struct *p, struct rq *rq, bool enforce) { return false; }
static inline bool consume_remote_task(struct rq *this_rq, struct task_struct *p, struct scx_dispatch_q *dsq, struct rq *task_rq) { return false; }
#endif /* CONFIG_SMP */
@ -2717,7 +2720,6 @@ static void dispatch_to_local_dsq(struct rq *rq, struct scx_dispatch_q *dst_dsq,
unlikely(!task_can_run_on_remote_rq(p, dst_rq, true))) {
dispatch_enqueue(find_global_dsq(p), p,
enq_flags | SCX_ENQ_CLEAR_OPSS);
__scx_add_event(SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE, 1);
return;
}