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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 CWXP123MB3254.GBRP123.PROD.OUTLOOK.COM (2603:10a6:400:33::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.315.14; Sat, 15 Aug 2026 23:36:58 +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 15.21.0315.016; Sat, 15 Aug 2026 23:36:58 +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 1/3] perf trace: Introduce kernel symbol beautifier for virtual addresses Date: Sat, 15 Aug 2026 19:36:49 -0400 Message-ID: <20260815233651.527936-2-atomlin@atomlin.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260815233651.527936-1-atomlin@atomlin.com> References: <20260815233651.527936-1-atomlin@atomlin.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BN9PR03CA0682.namprd03.prod.outlook.com (2603:10b6:408:10e::27) To CWLP123MB6607.GBRP123.PROD.OUTLOOK.COM (2603:10a6:400:183::5) Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CWLP123MB6607:EE_|CWXP123MB3254:EE_ X-MS-Office365-Filtering-Correlation-Id: 2de31886-c83b-4beb-7daf-08defb26196d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|23010399003|376014|366016|7416014|6133799003|10067099003|56012099006|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?kWi7w8cxiaT7qVt3gN/Awbim9vfZOIcP7TTkvkHYyyTBgpcEYrJNqh1vqWfm?= =?us-ascii?Q?E0PGp8cWTrscFzrNPt+DIUssIwSA3FyMv7hVMXfxRjdr1OMqWf/jDEvBTV2n?= =?us-ascii?Q?P08gQH5uoFNkjaiXa367GXejJZravO72jg6VhHklsjZLjd3CjVQBypqqrQFy?= =?us-ascii?Q?6+NeBoo5I6W4lIsH97g1XOgnLVJ1pcwdE0SchXtQo0tzKE0ont/CcYWFqwCh?= =?us-ascii?Q?il1zBkOy8INHAzCyf48CNUzsUT/2/ZfSEZHCeDZ31eDp4C+l/peFlpLvqxxB?= =?us-ascii?Q?tM627918aqIoKk9zoK7nh3bjcSiJOj0QWcP4bpGYfFRLBmWZE566ZJHzuMuF?= =?us-ascii?Q?nzYTOmnBRruyEdBAm0e2nM1DEtVeHk/nC+Wqp7nKeQ7NospI4xObdBCUkUbn?= =?us-ascii?Q?8U+sP3+eOGdfxEICePoT2ZbTA1UmtWH6Dj+TOkVlNI77oNq0206VTT40Jf8Q?= =?us-ascii?Q?Vt8HQ/btEFVKz+Cbl/2rNVrbcelLVQGAjh9wA9gd6R5eSFS8jFdidReKeXhk?= =?us-ascii?Q?BJNMbaYxG856s5U5+N5g5TYWtZ2rA9sPLbP3LA5/9xXC+s4G2Czxg8KEjjhv?= =?us-ascii?Q?yRQX/a3l4K+QDAhmOhWcP0zy61yu4IKbxu0vUuh8oCvLiWH9AYtUUSywNoFh?= =?us-ascii?Q?aZIsjQnRlmAa15NtOj3i1p2R4XIAjBx3kWEOBCIBWXddpGQXDaOtSsjBjHOk?= =?us-ascii?Q?U49o5nyFFMOuV9GSjiAvLHFR6QU214Xn46bhEuTKvHyB4jDSAMJ4F809BvVW?= =?us-ascii?Q?pbf7Ya9yXhEgk0jb5C6eIv1+nfwBd63U88JAW+MI5Jcq3Xb9JGMApX4Fs3l8?= =?us-ascii?Q?YQ+7YvxER2246B5cvy9DJnH4sTLwTUJNHAjNCZOU95YrooFp34ij+FAoQ158?= =?us-ascii?Q?CYWhJ023LtK2Cu398N31CG+rVJaZ4/IE85iBUdJMfukeHQbm1WlhtHuoGNUd?= =?us-ascii?Q?T3RF0zmM2KCfohl/26ZkEQzxJv8vCTnFF6aEOzi64QhYatOYYYC5+z+LaCJV?= =?us-ascii?Q?7Lt0AlRwj4d8VBr+iBXhXxRJxF3zrQ9iWMDKTS2t9kIXjnseLFV3zcdgEQ3a?= =?us-ascii?Q?jIkD6LdX0A4MywWkHE2hrRHaDwkBqmq6vMrs9fiqUrEYUGecFFdIjgQCbzL2?= =?us-ascii?Q?X18BSjjnWFM8zgzyVma04InbtU3P+wEncrm5JjZpLf2HYu0bjPKwyHa/64Ev?= =?us-ascii?Q?alqwksfUThxhO6GE2FlJ7h29jZFo72pOT87fzh97aEYu7cu27n97CLyOgBIK?= =?us-ascii?Q?QoGmHD2uzeG2+y7lJoJUgWmEWScgKaQLDjpcVv9YkuWWyUjmTP8dgPw5tEyz?= =?us-ascii?Q?dop13TOoOyGsmEeL8cVGLoOKm4saoKgOeTEAjZULkZxp9/6xsLXxr8xOm6FX?= =?us-ascii?Q?VWlF3QCdjGko+GFtXsvpxfq37nTrlpk1dNprp/kuE3qlHBRQQ4cJx1CUNUZ1?= =?us-ascii?Q?A4bVE/aaf/XUnoo9LbMBYDdSjof83HxDDQvPZugoNxsqWWf9FZGHnIo/48zm?= =?us-ascii?Q?h+Ar1qKpDw9h7XHb8veL3haNhclj6Cbv2pE3q89Y+FNKH5JWjIpLvlCbJLJx?= =?us-ascii?Q?R8QpWj8Z+tUaWdJ1g7EIHEffc1krBT8WFAmy1Oh7jA0yowLuzWbV9b3YX1Sr?= =?us-ascii?Q?37sP6cqxVtitt+N1XATz0UjVh4+rqgYf/UJ0Oqd0vuKVNSKlU6kBuCvroisE?= =?us-ascii?Q?Gb5vpQ4J5sr7triVBYuPsiizTZKD3cyQ1nogl7VSybFm41dbfzpFLP5iMDYI?= =?us-ascii?Q?rpivBTetsg=3D=3D?= X-OriginatorOrg: atomlin.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2de31886-c83b-4beb-7daf-08defb26196d X-MS-Exchange-CrossTenant-AuthSource: CWLP123MB6607.GBRP123.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Aug 2026 23:36:58.8399 (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: k2PeJNqbrUfgmrSWIo6oL7mL6/fNnzfpVZzB9D0rFmch7hpiNEjhURGnTPVl7x+fHLQWwIdwtTp2eqnA6HVXRA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CWXP123MB3254 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 | 24 ++++++++++++++++++++++++ tools/perf/trace/beauty/beauty.h | 3 +++ 2 files changed, 27 insertions(+) diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index c3c7f1f85c53..102221b301a5 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -750,6 +750,30 @@ 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; + 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; + + if (offset == 0) + return scnprintf(bf, size, "%s", sym->name); + return scnprintf(bf, size, "%s+0x%" PRIx64, + sym->name, offset); + } + } + + 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