Qitao Xu 70713dddf3 net_sched: introduce tracepoint trace_qdisc_enqueue() ... Tracepoint trace_qdisc_enqueue() is introduced to trace skb at the entrance of TC layer on TX side. This is similar to trace_qdisc_dequeue(): 1. For both we only trace successful cases. The failure cases can be traced via trace_kfree_skb(). 2. They are called at entrance or exit of TC layer, not for each ->enqueue() or ->dequeue(). This is intentional, because we want to make trace_qdisc_enqueue() symmetric to trace_qdisc_dequeue(), which is easier to use. The return value of qdisc_enqueue() is not interesting here, we have Qdisc's drop packets in ->dequeue(), it is impossible to trace them even if we have the return value, the only way to trace them is tracing kfree_skb(). We only add information we need to trace ring buffer. If any other information is needed, it is easy to extend it without breaking ABI, see commit 3dd344ea84 ("net: tracepoint: exposing sk_family in all tcp:tracepoints"). Reviewed-by: Cong Wang <cong.wang@bytedance.com> Signed-off-by: Qitao Xu <qitao.xu@bytedance.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2021-07-15 10:32:38 -07:00
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events	net_sched: introduce tracepoint trace_qdisc_enqueue()	2021-07-15 10:32:38 -07:00
bpf_probe.h	trace: bpf: Allow bpf to attach to bare tracepoints	2021-01-20 14:13:59 -08:00
define_trace.h
perf.h
syscall.h	tracepoints: Migrate to use SYSCALL_WORK flag	2020-11-16 21:53:15 +01:00
trace_events.h	trace: Add __print_ns_to_secs() and __print_ns_without_secs() helpers	2021-06-25 18:26:12 -04:00