From patchwork Mon Jan 22 07:40:14 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "yebin (H)" X-Patchwork-Id: 13524892 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) (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 CDB6A168AA; Mon, 22 Jan 2024 07:39:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.188 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705909142; cv=none; b=PU4CsH6YoOS1MtXlEfw8dNCvfxgrdPR39sCSgJkOwqnOs0OqsMbOWLNiBNMAYs5co9fMri2QFmbyM+TuX1buxWmiqe+VivYso/eJiGj97Q88OEV8ztXXQbyADE4wQ2Ge8fU4AzH6baPBj98WvX1/dlzbG6SbjE42BZyizNSUah8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705909142; c=relaxed/simple; bh=IZ2ztT+g8180deg7EL3rrFcIgg1N/vQXRmntkTF7fOc=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=DQ6elbccLNCRkKTj1QRYWxlHcgDPb8pkrKKwBBx1kt7scfyAEnDZLcsH0QVwfo2KRcSGpTt4A8CRDyntrhLPfo5F4l9K0p+x2veUumpbvNzTWG2PrVSTfJJCcLPOdcrC75SJ6JSy4/Z5fXmcSCOPNAuHs9+3PA2NkSrTVVraOT4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.163.252]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4TJMXX6lbvzbcGP; Mon, 22 Jan 2024 15:38:36 +0800 (CST) Received: from canpemm500010.china.huawei.com (unknown [7.192.105.118]) by mail.maildlp.com (Postfix) with ESMTPS id EB71D1850C9; Mon, 22 Jan 2024 15:38:58 +0800 (CST) Received: from huawei.com (10.175.127.227) by canpemm500010.china.huawei.com (7.192.105.118) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Mon, 22 Jan 2024 15:37:41 +0800 From: Ye Bin To: , , , CC: , Subject: [PATCH v2 6/7] Documentation: tracing: add new type '%pd' and '%pD' for kprobe Date: Mon, 22 Jan 2024 15:40:14 +0800 Message-ID: <20240122074015.4042575-7-yebin10@huawei.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20240122074015.4042575-1-yebin10@huawei.com> References: <20240122074015.4042575-1-yebin10@huawei.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To canpemm500010.china.huawei.com (7.192.105.118) Similar to printk() '%pd' is for fetch dentry's name from struct dentry's pointer, and '%pD' is for fetch file's name from struct file's pointer. Signed-off-by: Ye Bin --- Documentation/trace/kprobetrace.rst | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/Documentation/trace/kprobetrace.rst b/Documentation/trace/kprobetrace.rst index bf9cecb69fc9..a1d12d65a8dc 100644 --- a/Documentation/trace/kprobetrace.rst +++ b/Documentation/trace/kprobetrace.rst @@ -58,7 +58,8 @@ Synopsis of kprobe_events NAME=FETCHARG : Set NAME as the argument name of FETCHARG. FETCHARG:TYPE : Set TYPE as the type of FETCHARG. Currently, basic types (u8/u16/u32/u64/s8/s16/s32/s64), hexadecimal types - (x8/x16/x32/x64), "char", "string", "ustring", "symbol", "symstr" + (x8/x16/x32/x64), VFS layer common type(%pd/%pD) for print + file name, "char", "string", "ustring", "symbol", "symstr" and bitfield are supported. (\*1) only for the probe on function entry (offs == 0). Note, this argument access @@ -113,6 +114,9 @@ With 'symstr' type, you can filter the event with wildcard pattern of the symbols, and you don't need to solve symbol name by yourself. For $comm, the default type is "string"; any other type is invalid. +VFS layer common type(%pd/%pD) is a special type, which fetches dentry's or +file's name from struct dentry's pointer or struct file's pointer. + .. _user_mem_access: User Memory Access