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authorCong Wang <xiyou.wangcong@gmail.com>2020-05-27 07:35:25 +0300
committerDavid S. Miller <davem@davemloft.net>2020-05-28 01:05:49 +0300
commitf5a7833e83628f18c1ee94e6ffcb1d232f029be9 (patch)
tree744de84947c3dab8440aecda9c93f536e3437b3b /net
parenta34dac0b9055202cf9c64e08d8d8dc5e23029d3a (diff)
downloadlinux-f5a7833e83628f18c1ee94e6ffcb1d232f029be9.tar.xz
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')
-rw-r--r--net/sched/sch_api.c3
-rw-r--r--net/sched/sch_generic.c4
2 files changed, 6 insertions, 1 deletions
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 <net/pkt_sched.h>
#include <net/pkt_cls.h>
+#include <trace/events/qdisc.h>
+
/*
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;