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| author |   Changwoo Min <changwoo@igalia.com> | 2025-01-31 16:09:30 +0900 |
|---|---|---|
| committer |   Tejun Heo <tj@kernel.org> | 2025-02-02 07:23:18 -1000 |
| commit | 9be0a1b0c8fbd21ef6d7f9428a76b759f9db0de3 (patch) | |
| tree | bf2724b08b4b269bc6a363c3022cae3ca1a12a85 | |
| parent | sched_ext: Add an event, SCX_EV_SELECT_CPU_FALLBACK (diff) | |
| download | wireguard-linux-9be0a1b0c8fbd21ef6d7f9428a76b759f9db0de3.tar.xz wireguard-linux-9be0a1b0c8fbd21ef6d7f9428a76b759f9db0de3.zip | |
sched_ext: Add an event, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE
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>
| -rw-r--r-- | kernel/sched/ext.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index f80c8dc024a7..d1447f18381e 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -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); } /* |