sched-analyzer.bpf: Collect correct effective uclamp values

We must check that the effective value is active otherwise it contains
wrong data.

On the other hand we might be collecting the data at the wrong location
if active is false sometimes/all the times.

Signed-off-by: Qais Yousef <qyousef@layalina.io>

Author: qais-yousef

sched-analyzer.bpf.c

@@ -150,10 +150,16 @@ int BPF_PROG(handle_pelt_se, struct sched_entity *se)
 		bpf_printk("[%s] Req: uclamp_min = %lu uclamp_max = %lu",
 			   comm, uclamp_min, uclamp_max);
 
-		if (bpf_core_field_exists(p->uclamp[UCLAMP_MIN].value))
-			uclamp_min = BPF_CORE_READ_BITFIELD_PROBED(p, uclamp[UCLAMP_MIN].value);
-		if (bpf_core_field_exists(p->uclamp[UCLAMP_MAX].value))
-			uclamp_max = BPF_CORE_READ_BITFIELD_PROBED(p, uclamp[UCLAMP_MAX].value);
+		if (bpf_core_field_exists(p->uclamp[UCLAMP_MIN].value)) {
+			bool active = BPF_CORE_READ_BITFIELD_PROBED(p, uclamp[UCLAMP_MIN].active);
+			if (active)
+				uclamp_min = BPF_CORE_READ_BITFIELD_PROBED(p, uclamp[UCLAMP_MIN].value);
+		}
+		if (bpf_core_field_exists(p->uclamp[UCLAMP_MAX].value)) {
+			bool active = BPF_CORE_READ_BITFIELD_PROBED(p, uclamp[UCLAMP_MAX].active);
+			if (active)
+				uclamp_max = BPF_CORE_READ_BITFIELD_PROBED(p, uclamp[UCLAMP_MAX].value);
+		}
 
 		bpf_printk("[%s] Eff: uclamp_min = %lu uclamp_max = %lu",
 			   comm, uclamp_min, uclamp_max);