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sched_ext: Add tracepoint for scheduler exit

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sched_ext schedulers have state in BPF programs and kernel. scx_dump
provides kernel state and BPF program state on error, but this is static
in what it can provide.

Add a sched_ext_exit tracepoint in scx_claim_exit() so that BPF programs
can dynamically inspect scheduler specific state at the moment of exit.
Pass the exiting scx_sched so attached programs can read its state, and,
since exits propagate through a hierarchy of sub-schedulers, identify
which scheduler each event belongs to.

Signed-off-by: Pat Somaru <patso@likewhatevs.io>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Pat Somaru 2026-07-10 01:59:11 -04:00 committed by Tejun Heo
parent 3d1519011e
commit cbcda14b12
3 changed files with 36 additions and 0 deletions
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28
include/trace/events/sched_ext.h
View File

@ -84,6 +84,34 @@ TRACE_EVENT(sched_ext_bypass_lb,
)
);
TRACE_EVENT(sched_ext_exit,
TP_PROTO(struct scx_sched *sch, __u32 kind),
TP_ARGS(sch, kind),
TP_STRUCT__entry(
__string( name, sch->ops.name )
__field( __s32, level )
__field( __u64, sub_cgroup_id )
__string( cgrp_path, sch_cgrp_path(sch) )
__field( __u32, kind )
),
TP_fast_assign(
__assign_str(name);
__entry->level = sch->level;
__entry->sub_cgroup_id = sch->ops.sub_cgroup_id;
__assign_str(cgrp_path);
__entry->kind = kind;
),
TP_printk("sched %s level %d sub_cgroup_id %llu cgrp_path %s kind %u",
__get_str(name), __entry->level, __entry->sub_cgroup_id,
__get_str(cgrp_path), __entry->kind
)
);
#endif /* _TRACE_SCHED_EXT_H */
/* This part must be outside protection */

2
kernel/sched/ext/ext.c
View File

@ -5753,6 +5753,8 @@ static bool scx_claim_exit(struct scx_sched *sch, enum scx_exit_kind kind)
*/
WRITE_ONCE(sch->aborting, true);
trace_sched_ext_exit(sch, kind);
/*
* Propagate exits to descendants immediately. Each has a dedicated
* helper kthread and can run in parallel. While most of disabling is

6
kernel/sched/ext/sub.h
View File

@ -25,11 +25,17 @@ void scx_sub_disable(struct scx_sched *sch);
void scx_sub_enable_workfn(struct kthread_work *work);
bool scx_bpf_sub_dispatch(u64 cgroup_id, const struct bpf_prog_aux *aux);
static inline const char *sch_cgrp_path(struct scx_sched *sch)
{
return sch->cgrp_path;
}
#else /* CONFIG_EXT_SUB_SCHED */
static inline struct scx_sched *scx_next_descendant_pre(struct scx_sched *pos, struct scx_sched *root) { return pos ? NULL : root; }
static inline void scx_set_task_sched(struct task_struct *p, struct scx_sched *sch) {}
static inline struct cgroup *sch_cgroup(struct scx_sched *sch) { return NULL; }
static inline const char *sch_cgrp_path(struct scx_sched *sch) { return "/"; }
static inline void set_cgroup_sched(struct cgroup *cgrp, struct scx_sched *sch) {}
static inline void drain_descendants(struct scx_sched *sch) { }
static inline void scx_sub_disable(struct scx_sched *sch) { }