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net_sched: add tracepoints for qdisc_reset() and qdisc_destroy()

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Add two tracepoints for qdisc_reset() and qdisc_destroy() to track
qdisc resetting and destroying.

Sample output:

  tc-756   [000] ...3   138.355662: qdisc_reset: dev=ens3 kind=pfifo_fast parent=ffff:ffff handle=0:0
  tc-756   [000] ...1   138.355720: qdisc_reset: dev=ens3 kind=pfifo_fast parent=ffff:ffff handle=0:0
  tc-756   [000] ...1   138.355867: qdisc_reset: dev=ens3 kind=pfifo_fast parent=ffff:ffff handle=0:0
  tc-756   [000] ...1   138.355930: qdisc_destroy: dev=ens3 kind=pfifo_fast parent=ffff:ffff handle=0:0
  tc-757   [000] ...2   143.073780: qdisc_reset: dev=ens3 kind=fq_codel parent=ffff:ffff handle=8001:0
  tc-757   [000] ...1   143.073878: qdisc_reset: dev=ens3 kind=fq_codel parent=ffff:ffff handle=8001:0
  tc-757   [000] ...1   143.074114: qdisc_reset: dev=ens3 kind=fq_codel parent=ffff:ffff handle=8001:0
  tc-757   [000] ...1   143.074228: qdisc_destroy: dev=ens3 kind=fq_codel parent=ffff:ffff handle=8001:0

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>
This commit is contained in:
Cong Wang 2020-05-26 21:35:24 -07:00 committed by David S. Miller
parent 4909daba37
commit a34dac0b90
2 changed files with 56 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

52
include/trace/events/qdisc.h
View file

@ -8,6 +8,8 @@
#include <linux/netdevice.h>
#include <linux/tracepoint.h>
#include <linux/ftrace.h>
#include <linux/pkt_sched.h>
#include <net/sch_generic.h>
TRACE_EVENT(qdisc_dequeue,
@ -44,6 +46,56 @@ TRACE_EVENT(qdisc_dequeue,
__entry->txq_state, __entry->packets, __entry->skbaddr )
);
TRACE_EVENT(qdisc_reset,
TP_PROTO(struct Qdisc *q),
TP_ARGS(q),
TP_STRUCT__entry(
__string( dev, qdisc_dev(q) )
__string( kind, q->ops->id )
__field( u32, parent )
__field( u32, handle )
),
TP_fast_assign(
__assign_str(dev, qdisc_dev(q));
__assign_str(kind, q->ops->id);
__entry->parent = q->parent;
__entry->handle = q->handle;
),
TP_printk("dev=%s kind=%s parent=%x:%x handle=%x:%x", __get_str(dev),
__get_str(kind), TC_H_MAJ(__entry->parent) >> 16, TC_H_MIN(__entry->parent),
TC_H_MAJ(__entry->handle) >> 16, TC_H_MIN(__entry->handle))
);
TRACE_EVENT(qdisc_destroy,
TP_PROTO(struct Qdisc *q),
TP_ARGS(q),
TP_STRUCT__entry(
__string( dev, qdisc_dev(q) )
__string( kind, q->ops->id )
__field( u32, parent )
__field( u32, handle )
),
TP_fast_assign(
__assign_str(dev, qdisc_dev(q));
__assign_str(kind, q->ops->id);
__entry->parent = q->parent;
__entry->handle = q->handle;
),
TP_printk("dev=%s kind=%s parent=%x:%x handle=%x:%x", __get_str(dev),
__get_str(kind), TC_H_MAJ(__entry->parent) >> 16, TC_H_MIN(__entry->parent),
TC_H_MAJ(__entry->handle) >> 16, TC_H_MIN(__entry->handle))
);
#endif /* _TRACE_QDISC_H */
/* This part must be outside protection */

4
net/sched/sch_generic.c
View file

@ -911,6 +911,8 @@ void qdisc_reset(struct Qdisc *qdisc)
const struct Qdisc_ops *ops = qdisc->ops;
struct sk_buff *skb, *tmp;
trace_qdisc_reset(qdisc);
if (ops->reset)
ops->reset(qdisc);
@ -965,6 +967,8 @@ static void qdisc_destroy(struct Qdisc *qdisc)
module_put(ops->owner);
dev_put(qdisc_dev(qdisc));
trace_qdisc_destroy(qdisc);
call_rcu(&qdisc->rcu, qdisc_free_cb);
}