netdev - Re: [PATCH net-next v2] net: skb: export skb drop reaons to user by TRACE_DEFINE

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Date:   Thu, 27 Oct 2022 09:28:42 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ian Rogers <irogers@...gle.com>
Cc:     Menglong Dong <menglong8.dong@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Menglong Dong <imagedong@...cent.com>,
        David Ahern <dsahern@...nel.org>,
        Hao Peng <flyingpeng@...cent.com>,
        Dongli Zhang <dongli.zhang@...cle.com>, robh@...nel.org,
        Pavel Begunkov <asml.silence@...il.com>,
        Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
        Vasily Averin <vasily.averin@...ux.dev>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2] net: skb: export skb drop reaons to user by TRACE_DEFINE_ENUM

On Thu, Oct 27, 2022 at 8:43 AM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> On Thu, 27 Oct 2022 08:32:02 -0700
> Eric Dumazet <edumazet@...gle.com> wrote:
>
> > This seems broken again (tried on latest net-next tree)
> >
> > perf script
>
> Do you also have the latest perf and the latest libtraceevent installed?
>

I tried a more recent perf binary we have, but it is also not right.

I guess I will have to request a new perf binary at Google :/

perf5 script
         swapper     0 [030]  4147.704606: skb:kfree_skb: [UNKNOWN EVENT]
 kworker/30:1-ev   308 [030]  4147.704615: skb:kfree_skb: [UNKNOWN EVENT]
         swapper     0 [030]  4148.048173: skb:kfree_skb: [UNKNOWN EVENT]
 kworker/30:1-ev   308 [030]  4148.048179: skb:kfree_skb: [UNKNOWN EVENT]
         swapper     0 [008]  4148.048773: skb:kfree_skb: [UNKNOWN EVENT]
         swapper     0 [030]  4148.112271: skb:kfree_skb: [UNKNOWN EVENT]
 kworker/30:1-ev   308 [030]  4148.112280: skb:kfree_skb: [UNKNOWN EVENT]
         swapper     0 [030]  4148.720149: skb:kfree_skb: [UNKNOWN EVENT]
 kworker/30:1-ev   308 [030]  4148.720155: skb:kfree_skb: [UNKNOWN EVENT]
         swapper     0 [030]  4149.072141: skb:kfree_skb: [UNKNOWN EVENT]
 kworker/30:1-ev   308 [030]  4149.072149: skb:kfree_skb: [UNKNOWN EVENT]