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sched_ext: Add an event, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE

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Add a core event, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE, which represents how
many times a BPF scheduler tries to dispatch to an offlined local DSQ.

__scx_add_event() is used since the caller holds an rq lock,
so the preemption has already been disabled.

Signed-off-by: Changwoo Min <changwoo@igalia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Changwoo Min 2025-01-31 16:09:30 +09:00 committed by Tejun Heo
parent f7f6142107
commit 9be0a1b0c8
1 changed files with 9 additions and 0 deletions
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9
kernel/sched/ext.c
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@ -1449,6 +1449,12 @@ struct scx_event_stats {
* the core scheduler code silently picks a fallback CPU.
*/
u64 SCX_EV_SELECT_CPU_FALLBACK;
/*
* When dispatching to a local DSQ, the CPU may have gone offline in
* the meantime. In this case, the task is bounced to the global DSQ.
*/
u64 SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE;
};
/*
@ -2643,6 +2649,7 @@ static void dispatch_to_local_dsq(struct rq *rq, struct scx_dispatch_q *dst_dsq,
if (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;
}
@ -4969,6 +4976,7 @@ static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len)
scx_bpf_events(&events, sizeof(events));
scx_dump_event(s, &events, SCX_EV_SELECT_CPU_FALLBACK);
scx_dump_event(s, &events, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE);
if (seq_buf_has_overflowed(&s) && dump_len >= sizeof(trunc_marker))
memcpy(ei->dump + dump_len - sizeof(trunc_marker),
@ -7103,6 +7111,7 @@ __bpf_kfunc void scx_bpf_events(struct scx_event_stats *events,
for_each_possible_cpu(cpu) {
e_cpu = per_cpu_ptr(&event_stats_cpu, cpu);
scx_agg_event(&e_sys, e_cpu, SCX_EV_SELECT_CPU_FALLBACK);
scx_agg_event(&e_sys, e_cpu, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE);
}
/*