netdev - Stacks leading into skb:kfree

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Message-ID: <CABWYdi00L+O30Q=Zah28QwZ_5RU-xcxLFUK2Zj08A8MrLk9jzg@mail.gmail.com>
Date: Fri, 14 Jul 2023 15:13:06 -0700
From: Ivan Babrou <ivan@...udflare.com>
To: Linux Kernel Network Developers <netdev@...r.kernel.org>
Cc: kernel-team <kernel-team@...udflare.com>, Eric Dumazet <edumazet@...gle.com>, 
	"David S. Miller" <davem@...emloft.net>, Paolo Abeni <pabeni@...hat.com>, 
	Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	David Ahern <dsahern@...nel.org>, Jakub Kicinski <kuba@...nel.org>
Subject: Stacks leading into skb:kfree_skb

As requested by Jakub Kicinski and David Ahern here:

* https://lore.kernel.org/netdev/20230713201427.2c50fc7b@kernel.org/

I made some aggregations for the stacks we see leading into
skb:kfree_skb endpoint. There's a lot of data that is not easily
digestible, so I lightly massaged the data and added flamegraphs in
addition to raw stack counts. Here's the gist link:

* https://gist.github.com/bobrik/0e57671c732d9b13ac49fed85a2b2290

Let me know if any other format works better for you. I have perf
script output stashed just in case.

As a reminder (also mentioned in the gist), we're on v6.1, which is
the latest LTS.

I can't explain the reasons for all the network paths we have, but our
kernel / network people are CC'd if you have any questions.