kernel/include/trace/events/qdisc.h, branch linux-4.15.yHosts the 0x221E linux distro kernel.https://universe.0xinfinity.dev/distro/kernel/atom?h=linux-4.15.y2017-08-16T21:10:10Zqdisc: add tracepoint qdisc:qdisc_dequeue for dequeued SKBs2017-08-16T21:10:10ZJesper Dangaard Brouerbrouer@redhat.com2017-08-15T19:11:03Zurn:sha1:e543002f77f463501d47fab43acf7ba881e9dcaf
The main purpose of this tracepoint is to monitor bulk dequeue
in the network qdisc layer, as it cannot be deducted from the
existing qdisc stats.
The txq_state can be used for determining the reason for zero packet
dequeues, see enum netdev_queue_state_t.
Notice all packets doesn't necessary activate this tracepoint. As
qdiscs with flag TCQ_F_CAN_BYPASS, can directly invoke
sch_direct_xmit() when qdisc_qlen is zero.
Remember that perf record supports filters like:
perf record -e qdisc:qdisc_dequeue \
--filter 'ifindex == 4 && (packets > 1 || txq_state > 0)'
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>