netdev - Re: [PATCH] net/mlx4: tcp_drop replace of tcp_drop

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Message-ID: <CAM_iQpVVF1-CimWWK1E4gjjnNDYsAyHz2p+_VmRjVLqNW8+LsA@mail.gmail.com>
Date:   Mon, 30 Aug 2021 18:24:06 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     小严 <yan2228598786@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH] net/mlx4: tcp_drop replace of tcp_drop_new

On Tue, Aug 24, 2021 at 7:52 AM 小严 <yan2228598786@...il.com> wrote:
>
> The main reason is to distinguish the reason for each tcp deletion, __kfree_skb is to release the skb, and it is used in more places than just the skb, so it is impossible to trace the reason for the tcp deletion.

You can filter them out by 'location', which is the second parameter of
the tracepoint. Please check out the filter syntax for tracepoint here:
https://www.kernel.org/doc/html/v4.18/trace/events.html

Thanks.