[PATCH v5 26/29] sched/debug: Show the deadline bandwidth of each runqueue

[Mathieu Desnoyers <mathieu.desnoyers@efficios.com>]

For each CPU, sched_debug prints the deadline bandwidth of its root
domain. It does not print the two sums of its runqueue. this_bw is the
bandwidth of the deadline tasks assigned to the CPU. running_bw is the
part of it that belongs to active tasks.

GRUB reclaiming depends on both sums. grub_reclaim() takes this_bw -
running_bw as the inactive bandwidth of the CPU. The more inactive
bandwidth, the slower a reclaiming task uses up its runtime.

The kernel warns when a sum wraps around, and when running_bw exceeds
this_bw. Bandwidth left behind in this_bw triggers no warning.

Print both sums. The deadline_bw_test selftest added later in this
series reads this_bw in its params_waking and random_mix cases. It
checks that this_bw is back to its first value once their tasks are
gone.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
 kernel/sched/debug.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index e0d6cd3bd607..3dbe1d7d2d77 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -1174,6 +1174,8 @@ void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
 	SEQ_printf(m, "  .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x))
 
 	PU(dl_nr_running);
+	PU(running_bw);
+	PU(this_bw);
 	dl_bw = &cpu_rq(cpu)->rd->dl_bw;
 	SEQ_printf(m, "  .%-30s: %lld\n", "dl_bw->bw", dl_bw->bw);
 	SEQ_printf(m, "  .%-30s: %lld\n", "dl_bw->total_bw", dl_bw->total_bw);
-- 
2.47.3