linux-kernel - [PATCH v2 1/2] ref_tracker: add a top level debugfs directory for ref

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Message-Id: <20250408-netns-debugfs-v2-1-ca267f51461e@kernel.org>
Date: Tue, 08 Apr 2025 09:36:37 -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 1/2] ref_tracker: add a top level debugfs directory for
 ref_tracker

Add a new "ref_tracker" directory in debugfs. Each individual refcount
tracker can add a directory or files under there to display info about
currently-held references.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 include/linux/ref_tracker.h |  3 +++
 lib/ref_tracker.c           | 15 +++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/include/linux/ref_tracker.h b/include/linux/ref_tracker.h
index 8eac4f3d52547ccbaf9dcd09962ce80d26fbdff8..16fb6ec0cc7adc24457cfab13ee3994d85c15b39 100644
--- a/include/linux/ref_tracker.h
+++ b/include/linux/ref_tracker.h
@@ -22,6 +22,9 @@ struct ref_tracker_dir {
 };

 #ifdef CONFIG_REF_TRACKER
+#ifdef CONFIG_DEBUG_FS
+extern struct dentry *ref_tracker_debug_dir;
+#endif /* CONFIG_DEBUG_FS */

 static inline void ref_tracker_dir_init(struct ref_tracker_dir *dir,
 					unsigned int quarantine_count,
diff --git a/lib/ref_tracker.c b/lib/ref_tracker.c
index cf5609b1ca79361763abe5a3a98484a3ee591ff2..136723eab6b17ae07132c659fd1d8b0690d8c2d9 100644
--- a/lib/ref_tracker.c
+++ b/lib/ref_tracker.c
@@ -12,6 +12,8 @@
 #define REF_TRACKER_STACK_ENTRIES 16
 #define STACK_BUF_SIZE 1024

+struct dentry *ref_tracker_debug_dir;
+
 struct ref_tracker {
 	struct list_head	head;   /* anchor into dir->list or dir->quarantine */
 	bool			dead;
@@ -273,3 +275,16 @@ int ref_tracker_free(struct ref_tracker_dir *dir,
 	return 0;
 }
 EXPORT_SYMBOL_GPL(ref_tracker_free);
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+
+static int __init ref_tracker_debug_init(void)
+{
+	ref_tracker_debug_dir = debugfs_create_dir("ref_tracker", NULL);
+	if (IS_ERR(ref_tracker_debug_dir))
+		return PTR_ERR(ref_tracker_debug_dir);
+	return 0;
+}
+late_initcall(ref_tracker_debug_init);
+#endif /* CONFIG_DEBUG_FS */

-- 
2.49.0