Re: [lttng-dev] Can't receive a lot of functions that i registerd as trace-points

[Lin ArcX via lttng-dev <lttng-dev@lists.lttng.org>]

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On Tue, 24 Oct 2023 at 21:56, Kienan Stewart <kstewart@efficios.com> wrote:

> Hi Lin,
>
> could you keep the lttng-dev list in CC on your replies in the future?
>
Yes, sure.

>
>
> On 2023-10-24 09:25, Lin ArcX wrote:
> > Thanks for your response. i fixed the names. here is new commands:
> > # enable event for traced functions
> > sudo lttng enable-event --kernel
> irq_handler_entry,napi_poll,net_dev_queue
> >
> > # different name with kernel
> > sudo lttng enable-event --kernel
> >
> net_if_rx_entry,net_if_rx_ni_entry,net_napi_gro_receive_entry,net_if_receive_skb_list_entry,net_if_receive_skb
> >
> > Now In new tracefile i can see a lot of new events come. but still can't
> > see any trace from these:
> >
> > net_if_rx_ni_entry
> > net_napi_gro_receive_entry
> > net_if_receive_skb_list_entry
> >
> This looks fine to me.
>
> On a linux 4.19 system, I ran a test with using lttng-modules 2.12.14. I
> saw events for "net_napi_gro_receive_entry".
>
> In parallel with the LTTng tracing session, I ran
>
>    perf stat -e
>
> net:netif_rx_ni_entry,net:netif_receive_skb_list_entry,net:napi_gro_receive_entry
>
> The above allowed me to confirm that there were
> "net:napi_gro_receive_entry_events", but no "net:netif_rx_ni_entry" or
> "net:netif_receive_skb_list_entry" occurrences in my test.
>
> Are you seeing a situation where another tool is recording occurrences
> of the events that you think aren't being seen during your tracing session?
>

No, nothing, I'm running my client/server application inside wsl and no
other tools are running.

>
> thanks,
> kienan
>

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