netdev - Re: [PATCH] qdisc: add tracepoint qdisc:qdisc

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Date:   Tue, 15 Aug 2017 20:31:44 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>, netdev@...r.kernel.org
Cc:     pstaszewski@...are.pl
Subject: Re: [PATCH] qdisc: add tracepoint qdisc:qdisc_dequeue for dequeued
 SKBs

On 8/15/17 1:11 PM, Jesper Dangaard Brouer wrote:
> diff --git a/include/trace/events/qdisc.h b/include/trace/events/qdisc.h
> new file mode 100644
> index 000000000000..60d0d8bd336d
> --- /dev/null
> +++ b/include/trace/events/qdisc.h
> @@ -0,0 +1,50 @@
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM qdisc
> +
> +#if !defined(_TRACE_QDISC_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_QDISC_H_
> +
> +#include <linux/skbuff.h>
> +#include <linux/netdevice.h>
> +#include <linux/tracepoint.h>
> +#include <linux/ftrace.h>
> +
> +TRACE_EVENT(qdisc_dequeue,
> +
> +	TP_PROTO(struct Qdisc *qdisc, const struct netdev_queue *txq,
> +		 int packets, struct sk_buff *skb),
> +
> +	TP_ARGS(qdisc, txq, packets, skb),
> +
> +	TP_STRUCT__entry(
> +		__field(	struct Qdisc *,		qdisc	)
> +		__field(const	struct netdev_queue *,	txq	)

Why save qdisc and txq pointers in the tracepoint data?