sched_ext: Print core event count in scx_qmap scheduler

Modify the scx_qmap 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>

diff --git a/tools/sched_ext/scx_qmap.bpf.c b/tools/sched_ext/scx_qmap.bpf.c
index 3a20bb0c014a100b410f682f78d9319a00661009..5edb79742e379de566f44073a549a1994ff66323 100644 (file)
--- a/tools/sched_ext/scx_qmap.bpf.c
+++ b/tools/sched_ext/scx_qmap.bpf.c
@@ -763,6 +763,8 @@ static void dump_shared_dsq(void)
 
 static int monitor_timerfn(void *map, int *key, struct bpf_timer *timer)
 {
+       struct scx_event_stats events;
+
        bpf_rcu_read_lock();
        dispatch_highpri(true);
        bpf_rcu_read_unlock();
@@ -772,6 +774,23 @@ static int monitor_timerfn(void *map, int *key, struct bpf_timer *timer)
        if (print_shared_dsq)
                dump_shared_dsq();
 
+       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));
+
        bpf_timer_start(timer, ONE_SEC_IN_NS, 0);
        return 0;
 }