From patchwork Fri Apr 18 14:24:26 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 14057243 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 61C761ACED2; Fri, 18 Apr 2025 14:24:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744986279; cv=none; b=Bs+pye8KW809KP913DdR1qngTAXnOU+jxC1ShbaiuIyVR8H2X1RMacLB5ZTPpFl3OYCSSOCGiCmy5n4pymKSKkwI4oeVmpPcICpbVYNWax9LuY0akQO6/X2ifFShtQ+ZoXO4SmqKkTOGmqkBvvxT1B6zYqTA/YxP8sz0P9tKbJM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744986279; c=relaxed/simple; bh=h02vtg+uo9MQLcJqO0oaAc8ETCkA4CEZoiZkSocwMrw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=XCbEj1I1WEd0hLd7n4MHqJLE1CyQf8qhSVUpedYR9y8daeU5gNLzGuyEBehbTxoj/ZRHwgKxVEZSWgu13B+eDixPsMPSJlELlrIEHUFWS4YgNosafLRskNtje/ni+gYbEvDr0lspmEHxzECfMiXIcY3ZbTNM044H40eV9HXMCuA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=un2kzyb3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="un2kzyb3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DA7E4C4CEF4; Fri, 18 Apr 2025 14:24:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1744986278; bh=h02vtg+uo9MQLcJqO0oaAc8ETCkA4CEZoiZkSocwMrw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=un2kzyb3Jw5a/WGU7JhYO6HNh0+xXefSMmsB6B4+konGaaxnkDbToOx3+9/yADdkm aw4r0D+h2mXlRkZLS0c8WQVoOHNEhvOqiXNlumo3wN4QmlVtypdlklvGkwPOuStSq0 Igzn8GB7WxEqsqS3bPfHRToof+E5gFwGMChY205g9LmFpcpvNiJC5+igYMzpId3DCt UOj/yTi1orS84jLCJldUi9kPUyYnQ/NYe3cRlOb00cchG1QfFhhbU8vA69GbOz80Sa 71kJqor6t0HRnKLc4ymVgHRLUGZoUo+rJBLOmK3Yd1vXz/lQkFyzoCc/qKJda1kZh9 xeScjy+RFRzhQ== From: Jeff Layton Date: Fri, 18 Apr 2025 10:24:26 -0400 Subject: [PATCH v4 2/7] ref_tracker: add a top level debugfs directory for ref_tracker Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250418-reftrack-dbgfs-v4-2-5ca5c7899544@kernel.org> References: <20250418-reftrack-dbgfs-v4-0-5ca5c7899544@kernel.org> In-Reply-To: <20250418-reftrack-dbgfs-v4-0-5ca5c7899544@kernel.org> To: Andrew Morton , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Cc: Kuniyuki Iwashima , Qasim Ijaz , Nathan Chancellor , Andrew Lunn , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Jeff Layton X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1387; i=jlayton@kernel.org; h=from:subject:message-id; bh=h02vtg+uo9MQLcJqO0oaAc8ETCkA4CEZoiZkSocwMrw=; b=owEBbQKS/ZANAwAIAQAOaEEZVoIVAcsmYgBoAmChj0j6vUf8B5bNul8O2TxbCZBTtvMU/Q6Nx ZAl3cka4feJAjMEAAEIAB0WIQRLwNeyRHGyoYTq9dMADmhBGVaCFQUCaAJgoQAKCRAADmhBGVaC FbuTEACmmnkYke/tsMFojYkHwz19RJIkrW6WhN54fGH+wClmIkUS6FR3EPYNXgzK5/cjoTWaLtt qNdTVhMzFBy0L2BvBMISnz7bhrWdOIc5W6cVOr+U1xdLZn/NHLcYy4q4uG8qiWqGEjivgr/qHc1 WkiOh8VCZUH7fgDtLo5YvbRMwBu8j/BCAsGM1cqFXHSY422TgQClNOSSBGifE3oOpSRyQl5kQUr 2r+DqCG6bY0cOnJ1Cgp20KG8rQoPCYd5SqL+cXp4E685SLjJDFDvZFmZk+Zx/j7/7yGJz6/j/a6 iegQt398aDjriMNRR+gkIHxbi2imEhI6sTiwhJO/ByHYLiO09rd1pUzGa8RNokFe+WqkLtv1Th9 xiH0Yr/+XaF8J1PL/mkvWTU/8h7bPJo6huT/D9iIwOr51bZXhQ441TSaPstz1OkFEEdv4bhn2xy KVz7rBnGj0nbSjk8GZGQOp/5Hd9yK3AzApEjmqGGEsfsldeUcCvxlMi48I1JDMOXG9+YmblFdcR FJhpg/Q3iQDGb4lTwo4F6icpQ2Xdua4gQomjruLLgJP/8rqR7X+YKEX3Pa1jBO7tx1HF1ZYTbVJ 4U+G5ae78/FP2LNS6pMnol0Mwk5la+37QtAjWAF40P26PnExgvcOm6CGd5FlREGnWvq+kCOul/c 0cxhtmw2hJWjWYw== X-Developer-Key: i=jlayton@kernel.org; a=openpgp; fpr=4BC0D7B24471B2A184EAF5D3000E684119568215 Add a new "ref_tracker" directory in debugfs. Each individual refcount tracker can register files under there to display info about currently-held references. Reviewed-by: Andrew Lunn Signed-off-by: Jeff Layton --- lib/ref_tracker.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/lib/ref_tracker.c b/lib/ref_tracker.c index de71439e12a3bab6456910986fa611dfbdd97980..a66cde325920780cfe7529ea9d827d0ee943318d 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 +static struct dentry *ref_tracker_debug_dir = (struct dentry *)-ENOENT; + struct ref_tracker { struct list_head head; /* anchor into dir->list or dir->quarantine */ bool dead; @@ -273,3 +275,17 @@ int ref_tracker_free(struct ref_tracker_dir *dir, return 0; } EXPORT_SYMBOL_GPL(ref_tracker_free); + +#ifdef CONFIG_DEBUG_FS +#include + +static int __init ref_tracker_debugfs_init(void) +{ + ref_tracker_debug_dir = debugfs_create_dir("ref_tracker", NULL); + if (IS_ERR(ref_tracker_debug_dir)) + pr_warn("ref_tracker: unable to create debugfs ref_tracker directory: %pe\n", + ref_tracker_debug_dir); + return 0; +} +late_initcall(ref_tracker_debugfs_init); +#endif /* CONFIG_DEBUG_FS */