From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) (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 00EE75820F; Tue, 23 Jan 2024 09:19:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.255 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706001555; cv=none; b=ffRAsv5+If3ukNTRxzew/9XUkOLkwyfSqCaONgy9CMeFmrihe3D8DgPCaTma9Vqe2ivlCXAIPOHXl9pvUy0Inj6S67lv2Rk8K+Em9+5KBSF/lyU7Lp72Qi3ifUtvKBh577Dtwc6LT73WW9fEBSK7t3U0Jyj8jzHWoyfcU0YtqJM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706001555; c=relaxed/simple; bh=jUHVuIs/UapfTOlXV8cUELrTxUQ8NolJD73xVsvPNbI=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=EKXwloVVH875iUmLMRox2H3jb3ymG9cy0DfIXkkAADnAL7YEWImMUOMWrbJy1edQh6fsqdAg3KAWILFOHNKQrAQkEs91aKwA/z/+4ZfUsDDvkL2kLjtKbyk5I7Ey9Br+nuMbGMy2FM18yl9zdZdtXIpKF9FKFVh+POHW0MDfjhg= 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=45.249.212.255 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 [172.19.88.194]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4TK1hv3qXMz18KL3; Tue, 23 Jan 2024 17:18:07 +0800 (CST) Received: from canpemm500010.china.huawei.com (unknown [7.192.105.118]) by mail.maildlp.com (Postfix) with ESMTPS id D35EC1404FD; Tue, 23 Jan 2024 17:19:08 +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; Tue, 23 Jan 2024 17:19:03 +0800 From: Ye Bin To: , , , CC: , Subject: [PATCH v4 0/7] support '%pd' and '%pD' for print file name Date: Tue, 23 Jan 2024 17:21:32 +0800 Message-ID: <20240123092139.3698375-1-yebin10@huawei.com> X-Mailer: git-send-email 2.31.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To canpemm500010.china.huawei.com (7.192.105.118) During fault locating, the file name needs to be printed based on the dentry/file address. The offset needs to be calculated each time, which is troublesome. Similar to printk, kprobe supports printing file names for dentry/file addresses. Diff v4 vs v3: 1. Use "argv[i][idx + 3] == 'd'" instead of "argv[i][strlen(argv[i]) - 1] == 'd'" to judge print format in PATCH[4/7]; Diff v3 vs v2: 1. Return the index of where the suffix was found in str_has_suffix(); Diff v2 vs v1: 1. Use "%pd/%pD" print format instead of "pd/pD" print format; 2. Add "%pd/%pD" in README; 3. Expand "%pd/%pD" argument before parameter parsing; 4. Add more detail information in ftrace documentation; 5. Add test cases for new print format in selftests/ftrace; Ye Bin (7): string.h: add str_has_suffix() helper for test string ends with specify string tracing/probes: add traceprobe_expand_dentry_args() helper tracing/probes: support '%pd' type for print struct dentry's name tracing/probes: support '%pD' type for print struct file's name tracing: add new type "%pd/%pD" in readme_msg[] Documentation: tracing: add new type '%pd' and '%pD' for kprobe selftests/ftrace: add test cases for VFS type "%pd" and "%pD" Documentation/trace/kprobetrace.rst | 6 +- include/linux/string.h | 28 +++++++ kernel/trace/trace.c | 2 +- kernel/trace/trace_kprobe.c | 6 ++ kernel/trace/trace_probe.c | 47 +++++++++++ kernel/trace/trace_probe.h | 3 + .../ftrace/test.d/kprobe/kprobe_args_vfs.tc | 79 +++++++++++++++++++ 7 files changed, 169 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_vfs.tc -- 2.31.1