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sched_ext: Print core event count in scx_central scheduler

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Modify the scx_central scheduler to print the core event counter
every second.

Signed-off-by: Changwoo Min <changwoo@igalia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Changwoo Min
2025-02-04 14:20:56 +09:00
committed by Tejun Heo
parent 9865f31d85
commit 6df93804b7
1 changed files with 21 additions and 0 deletions
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21
tools/sched_ext/scx_central.bpf.c
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@@ -256,6 +256,7 @@ static int central_timerfn(void *map, int *key, struct bpf_timer *timer)
u64 now = scx_bpf_now();
u64 nr_to_kick = nr_queued;
s32 i, curr_cpu;
struct scx_event_stats events;
curr_cpu = bpf_get_smp_processor_id();
if (timer_pinned && (curr_cpu != central_cpu)) {
@@ -291,6 +292,26 @@ static int central_timerfn(void *map, int *key, struct bpf_timer *timer)
bpf_timer_start(timer, TIMER_INTERVAL_NS, BPF_F_TIMER_CPU_PIN);
__sync_fetch_and_add(&nr_timers, 1);
/* print event counters every second */
if (nr_timers % 1000 == 0) {
scx_bpf_events(&events, sizeof(events));
bpf_printk("%35s: %llu\n", "SCX_EV_SELECT_CPU_FALLBACK",
scx_read_event(&events, SCX_EV_SELECT_CPU_FALLBACK));
bpf_printk("%35s: %llu\n", "SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE",
scx_read_event(&events, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE));
bpf_printk("%35s: %llu\n", "SCX_EV_DISPATCH_KEEP_LAST",
scx_read_event(&events, SCX_EV_DISPATCH_KEEP_LAST));
bpf_printk("%35s: %llu\n", "SCX_EV_ENQ_SKIP_EXITING",
scx_read_event(&events, SCX_EV_ENQ_SKIP_EXITING));
bpf_printk("%35s: %llu\n", "SCX_EV_BYPASS_DURATION",
scx_read_event(&events, SCX_EV_BYPASS_DURATION));
bpf_printk("%35s: %llu\n", "SCX_EV_BYPASS_DISPATCH",
scx_read_event(&events, SCX_EV_BYPASS_DISPATCH));
bpf_printk("%35s: %llu\n", "SCX_EV_BYPASS_ACTIVATE",
scx_read_event(&events, SCX_EV_BYPASS_ACTIVATE));
}
return 0;
}