netdev - [PATCH v2 0/2] net: add debugfs files for showing netns refcount tracking info

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Message-Id: <20250408-netns-debugfs-v2-0-ca267f51461e@kernel.org>
Date: Tue, 08 Apr 2025 09:36:36 -0400
From: Jeff Layton <jlayton@...nel.org>
To: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
 Andrew Morton <akpm@...ux-foundation.org>
Cc: Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Jeff Layton <jlayton@...nel.org>
Subject: [PATCH v2 0/2] net: add debugfs files for showing netns refcount
 tracking info

Recently, I had a need to track down some long-held netns references,
and discovered CONFIG_NET_NS_REFCNT_TRACKER. The main thing that seemed
to be missing from it though is a simple way to view the currently held
references on the netns. This adds files in debugfs for this.

Eric, I didn't incorporate your proposed patch to limit how long this
code spends in ref_tracker_dir_snprint(), as it didn't apply properly.
If you send that as a formal patch, or point me at a branch to base this
on, I can rebase this series on top.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
Changes in v2:
- add top-level ref_tracker directory in debugfs, and move net_ns directory under it
- Link to v1: https://lore.kernel.org/r/20250324-netns-debugfs-v1-1-c75e9d5a6266@kernel.org

---
Jeff Layton (2):
      ref_tracker: add a top level debugfs directory for ref_tracker
      net: add debugfs files for showing netns refcount tracking info

 include/linux/ref_tracker.h |   3 +
 lib/ref_tracker.c           |  15 +++++
 net/core/net_namespace.c    | 151 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 169 insertions(+)
---
base-commit: 695caca9345a160ecd9645abab8e70cfe849e9ff
change-id: 20250324-netns-debugfs-df213b2ab9ce

Best regards,
-- 
Jeff Layton <jlayton@...nel.org>