netdev - [PATCH iproute2-next] tc: fq: display unthrottle latency

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Date:   Wed, 28 Sep 2016 06:23:15 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev <netdev@...r.kernel.org>
Subject: [PATCH iproute2-next] tc: fq: display unthrottle latency

From: Eric Dumazet <edumazet@...gle.com>

In linux-4.9 fq packet scheduler got a new stat :

unthrottle_latency in nano second units.

Gives a good indication of system load or timer implementation
latencies.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/linux/pkt_sched.h |    2 +-
 tc/q_fq.c                 |    3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/pkt_sched.h b/include/linux/pkt_sched.h
index f8e39db..df7451d 100644
--- a/include/linux/pkt_sched.h
+++ b/include/linux/pkt_sched.h
@@ -811,7 +811,7 @@ struct tc_fq_qd_stats {
 	__u32	flows;
 	__u32	inactive_flows;
 	__u32	throttled_flows;
-	__u32	pad;
+	__u32	unthrottle_latency_ns;
 };
 
 /* Heavy-Hitter Filter */
diff --git a/tc/q_fq.c b/tc/q_fq.c
index 90147a6..c9efbfc 100644
--- a/tc/q_fq.c
+++ b/tc/q_fq.c
@@ -312,6 +312,9 @@ static int fq_print_xstats(struct qdisc_util *qu, FILE *f,
 
 	fprintf(f, ", %llu throttled", st->throttled);
 
+	if (st->unthrottle_latency_ns)
+		fprintf(f, ", %u ns latency", st->unthrottle_latency_ns);
+
 	if (st->flows_plimit)
 		fprintf(f, ", %llu flows_plimit", st->flows_plimit);