sched/debug: Add task uclamp values to SCHED_DEBUG procfs

Requested and effective uclamp values can be a bit tricky to decipher when
playing with cgroup hierarchies. Add them to a task's procfs when
SCHED_DEBUG is enabled.

Reviewed-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200226124543.31986-4-valentin.schneider@arm.com

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 315ef6d..a562df5 100644 (file)
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -947,6 +947,12 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
        P(se.avg.util_est.ewma);
        P(se.avg.util_est.enqueued);
 #endif
+#ifdef CONFIG_UCLAMP_TASK
+       __PS("uclamp.min", p->uclamp[UCLAMP_MIN].value);
+       __PS("uclamp.max", p->uclamp[UCLAMP_MAX].value);
+       __PS("effective uclamp.min", uclamp_eff_value(p, UCLAMP_MIN));
+       __PS("effective uclamp.max", uclamp_eff_value(p, UCLAMP_MAX));
+#endif
        P(policy);
        P(prio);
        if (task_has_dl_policy(p)) {