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| author | Cong Wang <xiyou.wangcong@gmail.com> | 2020-05-26 21:35:25 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-05-27 15:05:49 -0700 |
| commit | f5a7833e83628f18c1ee94e6ffcb1d232f029be9 (patch) | |
| tree | 744de84947c3dab8440aecda9c93f536e3437b3b /net/sched/sch_generic.c | |
| parent | a34dac0b9055202cf9c64e08d8d8dc5e23029d3a (diff) | |
| download | lwn-f5a7833e83628f18c1ee94e6ffcb1d232f029be9.tar.gz lwn-f5a7833e83628f18c1ee94e6ffcb1d232f029be9.zip | |
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 <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_generic.c')
| -rw-r--r-- | net/sched/sch_generic.c | 4 |
1 files changed, 3 insertions, 1 deletions
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; |