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sched_ext: Print sub-scheduler disabled log and reason

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Take scx_qmap for example, when sub scheduler is attached, there is
'BPF sub-scheduler "qmap" enabled' message, but when detached, the log
is missing. Add a new function to do the log thing, it can be used by
both root scheduler and sub scheduler.

Signed-off-by: Zhao Mengmeng <zhaomengmeng@kylinos.cn>
Reviewed-by: Cheng-Yang Chou <yphbchou0911@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Zhao Mengmeng 2026-04-17 17:18:03 +08:00 committed by Tejun Heo
parent 26fb937c7b
commit 5425abc222
1 changed files with 24 additions and 15 deletions
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39
kernel/sched/ext.c
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@ -5526,6 +5526,26 @@ static void scx_disable_dump(struct scx_sched *sch)
sch->dump_disabled = true;
}
static void scx_log_sched_disable(struct scx_sched *sch)
{
struct scx_exit_info *ei = sch->exit_info;
const char *type = scx_parent(sch) ? "sub-scheduler" : "scheduler";
if (ei->kind >= SCX_EXIT_ERROR) {
pr_err("sched_ext: BPF %s \"%s\" disabled (%s)\n", type,
sch->ops.name, ei->reason);
if (ei->msg[0] != '\0')
pr_err("sched_ext: %s: %s\n", sch->ops.name, ei->msg);
#ifdef CONFIG_STACKTRACE
stack_trace_print(ei->bt, ei->bt_len, 2);
#endif
} else {
pr_info("sched_ext: BPF %s \"%s\" disabled (%s)\n", type,
sch->ops.name, ei->reason);
}
}
#ifdef CONFIG_EXT_SUB_SCHED
static DECLARE_WAIT_QUEUE_HEAD(scx_unlink_waitq);
@ -5696,6 +5716,8 @@ static void scx_sub_disable(struct scx_sched *sch)
&sub_detach_args);
}
scx_log_sched_disable(sch);
if (sch->ops.exit)
SCX_CALL_OP(sch, exit, NULL, sch->exit_info);
kobject_del(&sch->kobj);
@ -5707,7 +5729,6 @@ static void scx_sub_disable(struct scx_sched *sch) { }
static void scx_root_disable(struct scx_sched *sch)
{
struct scx_exit_info *ei = sch->exit_info;
struct scx_task_iter sti;
struct task_struct *p;
int cpu;
@ -5797,22 +5818,10 @@ static void scx_root_disable(struct scx_sched *sch)
scx_idle_disable();
synchronize_rcu();
if (ei->kind >= SCX_EXIT_ERROR) {
pr_err("sched_ext: BPF scheduler \"%s\" disabled (%s)\n",
sch->ops.name, ei->reason);
if (ei->msg[0] != '\0')
pr_err("sched_ext: %s: %s\n", sch->ops.name, ei->msg);
#ifdef CONFIG_STACKTRACE
stack_trace_print(ei->bt, ei->bt_len, 2);
#endif
} else {
pr_info("sched_ext: BPF scheduler \"%s\" disabled (%s)\n",
sch->ops.name, ei->reason);
}
scx_log_sched_disable(sch);
if (sch->ops.exit)
SCX_CALL_OP(sch, exit, NULL, ei);
SCX_CALL_OP(sch, exit, NULL, sch->exit_info);
scx_unlink_sched(sch);