From f5a7833e83628f18c1ee94e6ffcb1d232f029be9 Mon Sep 17 00:00:00 2001 From: Cong Wang Date: Tue, 26 May 2020 21:35:25 -0700 Subject: net_sched: add a tracepoint for qdisc creation With this tracepoint, we could know when qdisc's are created, especially those default qdisc's. Sample output: tc-736 [001] ...1 56.230107: qdisc_create: dev=ens3 kind=pfifo parent=1:0 tc-736 [001] ...1 56.230113: qdisc_create: dev=ens3 kind=hfsc parent=ffff:ffff tc-738 [001] ...1 56.256816: qdisc_create: dev=ens3 kind=pfifo parent=1:100 tc-739 [001] ...1 56.267584: qdisc_create: dev=ens3 kind=pfifo parent=1:200 tc-740 [001] ...1 56.279649: qdisc_create: dev=ens3 kind=fq_codel parent=1:100 tc-741 [001] ...1 56.289996: qdisc_create: dev=ens3 kind=pfifo_fast parent=1:200 tc-745 [000] .N.1 111.687483: qdisc_create: dev=ens3 kind=ingress parent=ffff:fff1 Cc: Jamal Hadi Salim Cc: Jiri Pirko Signed-off-by: Cong Wang Signed-off-by: David S. Miller --- net/sched/sch_api.c | 3 +++ net/sched/sch_generic.c | 4 +++- 2 files changed, 6 insertions(+), 1 deletion(-) (limited to 'net/sched') diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 0d99df1e764d..9a3449b56bd6 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -32,6 +32,8 @@ #include #include +#include + /* Short review. @@ -1283,6 +1285,7 @@ static struct Qdisc *qdisc_create(struct net_device *dev, } qdisc_hash_add(sch, false); + trace_qdisc_create(ops, dev, parent); return sch; diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index abaa446ed01a..a4271e47f220 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -896,8 +896,10 @@ struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, } sch->parent = parentid; - if (!ops->init || ops->init(sch, NULL, extack) == 0) + if (!ops->init || ops->init(sch, NULL, extack) == 0) { + trace_qdisc_create(ops, dev_queue->dev, parentid); return sch; + } qdisc_put(sch); return NULL; -- cgit v1.2.3