[PATCH v4 23/26] sched/debug: Show the deadline bandwidth of each runqueue

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

sched_debug prints the bandwidth each root domain has handed out
(dl_bw->total_bw), and nothing of the two sums each runqueue keeps:
this_bw, the bandwidth of every deadline task of that CPU, and
running_bw, the part of it whose tasks are active. GRUB drains the
runtime of a reclaiming task at the rate the two give, the bandwidth of
its CPU that is reserved and active (grub_reclaim(): max_bw - (this_bw -
running_bw) - extra_bw): the less of its CPU is active, the slower its
runtime drains, and the longer it runs on.

Both sums have invariants a test can check, which the kernel itself
warns about when they break: neither may wrap, and running_bw never
exceeds this_bw. Print them.

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 5f8303630296..463f077fa703 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -1173,6 +1173,8 @@ 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