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mx.microsoft.com 1; spf=pass smtp.mailfrom=atomlin.com; dmarc=pass action=none header.from=atomlin.com; dkim=pass header.d=atomlin.com; arc=none Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=atomlin.com; Received: from CWLP123MB6607.GBRP123.PROD.OUTLOOK.COM (2603:10a6:400:183::5) by LO3P123MB3193.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:b5::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.339.11; Sat, 22 Aug 2026 21:36:19 +0000 Received: from CWLP123MB6607.GBRP123.PROD.OUTLOOK.COM ([fe80::cec4:77ab:262e:d230]) by CWLP123MB6607.GBRP123.PROD.OUTLOOK.COM ([fe80::cec4:77ab:262e:d230%4]) with mapi id 15.21.0339.010; Sat, 22 Aug 2026 21:36:19 +0000 From: Aaron Tomlin To: peterz@infradead.org, mingo@redhat.com, acme@kernel.org, namhyung@kernel.org Cc: mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com, james.clark@linaro.org, howardchu95@gmail.com, atomlin@atomlin.com, neelx@suse.com, chjohnst@mail.com, sean@ashe.io, steve@abita.co, rishil1999@outlook.com, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH perf-tools-next v5 1/4] perf trace: Introduce kernel symbol beautifier for virtual addresses Date: Sat, 22 Aug 2026 17:35:55 -0400 Message-ID: <20260822213558.704018-2-atomlin@atomlin.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260822213558.704018-1-atomlin@atomlin.com> References: <20260822213558.704018-1-atomlin@atomlin.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: LO4P123CA0429.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:18b::20) To CWLP123MB6607.GBRP123.PROD.OUTLOOK.COM (2603:10a6:400:183::5) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CWLP123MB6607:EE_|LO3P123MB3193:EE_ X-MS-Office365-Filtering-Correlation-Id: c83c2c4d-2c1d-4ec8-1b27-08df00955c2f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|23010399003|366016|10067099003|56012099006|6133799003|18002099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?as08O7bvpZGQ/A5bF6hhxmqNG8mMqr3Osy/rqMr72CicOGzwBpu+cMWn417g?= =?us-ascii?Q?AyRfPC8tRYsfAE/0A83mNHIEcUcxCP7ud0Yj64HT1poV46FM+pesilHiQtcF?= =?us-ascii?Q?KPXnY6L1FrGlgk+eFetYfBzSIW4+rUeN1MmXqKMztBnT2dl9WsceCV2FvQ+b?= =?us-ascii?Q?BymNtDmJCK7m2Lt9HpbP/iIs9ojHHWW5sgeHzzZR0Er6JUdYZVyqbBa3QNMx?= =?us-ascii?Q?C+a8qI81jqqW2AqHbhEiOqxFyu7S0CM3jOyFk1UYaOFP2K6JtUnEvMbhC2Ur?= =?us-ascii?Q?wBLz4I7KUt9YtgsAsYqI7F7QvURJeAsH4c/q0I5f0mdKli4v8ju3smKIx1Ty?= =?us-ascii?Q?/hYV8tKBvTuuta7QbwrDoqH4bJV/qGTacdKcUU3OLcFf3s/YvseYbrdW1xS0?= =?us-ascii?Q?vtcUw1ENR54cas9jVofULieZkFiBBAE07/OHeUk/4QVYDlWUJjRHgl8kl6/P?= =?us-ascii?Q?Ji48c7VL8M3CxgkywCj/q/o5Wgy94jjz3kpDIEg5jgVAVbyKBJ602TpoEe2d?= =?us-ascii?Q?Wd4Luf0pbD2mYQ9Z1/xGP+V+/i0TZHweXuWfRmRXeqSFMqBNMzIyin7FCGfd?= =?us-ascii?Q?mzgAHWcmWhHSkPPGrVBmUBhpS3sJORoETyKLY7hK+rrr9E2d81kjw+wGH164?= =?us-ascii?Q?ia48gIF1JQlT+DasIfABdOLThQ+da9VliccZSv+n3PhKGoHysffylfuzNHwQ?= =?us-ascii?Q?+MFSlOHQ6GQdsox1KG0S2JNxVqzvbK4FHyb5lE3gNydP2ihJLgg+t+verKQm?= =?us-ascii?Q?NnF/2OEYwRZgd/zCmT5s5DDre/5o+W7T38r3sjmI1Uvt9SJO65SSUsIgLg68?= =?us-ascii?Q?EIVli0NK73RDYjCCGVKNlgKhEW3AJxxDfYA4cg7Py73u6Ab7PN32fFWeDHvQ?= =?us-ascii?Q?LXe0zloPCvoXt0KA3aLRfHrCmZZVgH5A1othp7VtAmZgAofuaFI4wdIV+Tun?= =?us-ascii?Q?FK33PiY3zHHBLbVrylMB15WxQz5ZbM0NQbhbz9zTF0CHOvDTgicD7EJwELTv?= =?us-ascii?Q?arHq7CJCa5hJj6lrWilNSOO7z3s0147XmxmZOOv9klpjBsG2FvYCb43CEk56?= =?us-ascii?Q?TaDISQOM10Hjd3SqZzIp44xJXG/52bJsY5nGzlX4hAfFmWEGHZjPcwkTxv15?= =?us-ascii?Q?UXw06KcMwRnQLPX4vndKCm9bTskha0F8tusgFhnNWxjMMr/8TPvNBEBCnE8R?= =?us-ascii?Q?yUwjSLWS+gw0FpxLWE/XZoq6f/pk+4HH2ck8XP8B2BmN2zluRky8uszAuDlT?= =?us-ascii?Q?9J2aSH5XjHCVXIif5WCsudzpqaqSbbfTHosyt+JC+6LoZVvzG1cVgla4pqQE?= =?us-ascii?Q?Cv3yBMgP4vw0/sTG6GdhhanvU0+dFF9HVn6sBNafVV5dFmrc2sl939ohsdIL?= =?us-ascii?Q?2qEIZ+5U3KtTSVOlcBWeRpAPoZLqpe0jbt9lOj/W9baRX19807/RCpA2HEq1?= =?us-ascii?Q?LsHy32XERSIx0UO2EsxBEa65hh0LM6ftM2eF8uUMT0k65icrf5dTLAfcImKL?= =?us-ascii?Q?YDBsiLofoQsdHNaxg7WvCQiDFLBlwOpq8La8ikypiEgl0Xm/j1ONhu6NFA2m?= =?us-ascii?Q?B2YGMOntOLIqxcAC7FWfCCnKAtvLj+dzwr2aqc0nfpXhQCo8hazrKAxD9pwZ?= =?us-ascii?Q?9YGlcbW1YBigmZHVGKF/B+HaTrK91t4+8mmm5Xjbpu1X2JSEQZ9/HsmTTxxq?= =?us-ascii?Q?Mb36piR5yLaxJFv1KcBCn9m4b201HAiM4OP7mIGM8B1YRcsF?= X-OriginatorOrg: atomlin.com X-MS-Exchange-CrossTenant-Network-Message-Id: c83c2c4d-2c1d-4ec8-1b27-08df00955c2f X-MS-Exchange-CrossTenant-AuthSource: CWLP123MB6607.GBRP123.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Aug 2026 21:36:00.7793 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: e6a32402-7d7b-4830-9a2b-76945bbbcb57 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: cHI5LLjkwCTN/Q+YAOmdBgZMozP+soROl+AgpSJegRnMXat4veY0W6CfZl8Wx9O+60Wc1zAoyq8yolDUuzofYg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: LO3P123MB3193 Currently, when 'perf trace' formats tracepoint payloads or system call arguments containing raw kernel virtual addresses (e.g., a work item function pointer work_func_t in workqueue:workqueue_execute_start), it prints them as raw hexadecimal values (e.g., 0xffffffff81234567). This impairs readability when tracing kernel execution flows. Introduce a dedicated kernel symbol beautifier, syscall_arg__scnprintf_ksym (i.e., SCA_KSYM), to resolve kernel virtual addresses to human-readable symbol names and offsets (e.g., "flush_to_ldisc"). The beautifier looks up the virtual address in the machine kernel maps via machine__find_kernel_symbol(). If a valid kernel symbol is found, the symbol name and offset are printed without requiring --libtraceevent; if the address is zero, "NULL" is rendered; otherwise, it gracefully falls back to hexadecimal formatting. Signed-off-by: Aaron Tomlin --- tools/perf/builtin-trace.c | 29 +++++++++++++++++++++++++++++ tools/perf/trace/beauty/beauty.h | 3 +++ 2 files changed, 32 insertions(+) diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index c3c7f1f85c53..003048946503 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -750,6 +750,35 @@ size_t syscall_arg__scnprintf_ptr(char *bf, size_t size, struct syscall_arg *arg return syscall_arg__scnprintf_hex(bf, size, arg); } +size_t syscall_arg__scnprintf_ksym(char *bf, size_t size, struct syscall_arg *arg) +{ + if (arg->val == 0) + return scnprintf(bf, size, "NULL"); + + if (arg->trace && arg->trace->host) { + struct map *map = NULL; + struct symbol *sym = machine__find_kernel_symbol(arg->trace->host, + arg->val, &map); + + if (sym) { + u64 start = map__unmap_ip(map, sym->start); + u64 offset = arg->val - start; + size_t printed; + + if (offset == 0) + printed = scnprintf(bf, size, "%s", sym->name); + else + printed = scnprintf(bf, size, "%s+0x%" PRIx64, + sym->name, offset); + map__put(map); + return printed; + } + map__put(map); + } + + return syscall_arg__scnprintf_hex(bf, size, arg); +} + size_t syscall_arg__scnprintf_int(char *bf, size_t size, struct syscall_arg *arg) { return scnprintf(bf, size, "%d", arg->val); diff --git a/tools/perf/trace/beauty/beauty.h b/tools/perf/trace/beauty/beauty.h index 58a3206481ae..0f4801c61a5b 100644 --- a/tools/perf/trace/beauty/beauty.h +++ b/tools/perf/trace/beauty/beauty.h @@ -160,6 +160,9 @@ size_t syscall_arg__scnprintf_hex(char *bf, size_t size, struct syscall_arg *arg size_t syscall_arg__scnprintf_ptr(char *bf, size_t size, struct syscall_arg *arg); #define SCA_PTR syscall_arg__scnprintf_ptr +size_t syscall_arg__scnprintf_ksym(char *bf, size_t size, struct syscall_arg *arg); +#define SCA_KSYM syscall_arg__scnprintf_ksym + size_t syscall_arg__scnprintf_int(char *bf, size_t size, struct syscall_arg *arg); #define SCA_INT syscall_arg__scnprintf_int -- 2.55.0