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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 CW1P123MB8695.GBRP123.PROD.OUTLOOK.COM (2603:10a6:400:274::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.270.18; Mon, 3 Aug 2026 21:08:50 +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 15.21.0270.017; Mon, 3 Aug 2026 21:08:50 +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 1/3] perf trace: Introduce kernel symbol beautifier for virtual addresses Date: Mon, 3 Aug 2026 17:08:40 -0400 Message-ID: <20260803210842.245789-2-atomlin@atomlin.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260803210842.245789-1-atomlin@atomlin.com> References: <20260803210842.245789-1-atomlin@atomlin.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BL1P222CA0027.NAMP222.PROD.OUTLOOK.COM (2603:10b6:208:2c7::32) 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_|CW1P123MB8695:EE_ X-MS-Office365-Filtering-Correlation-Id: ac4079c2-667e-45c1-9113-08def1a36a6f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|23010399003|366016|56012099006|10067099003|6133799003|22082099003|18002099003; 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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 5a3e043b5b72..cbc5bdc0cc12 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -749,6 +749,30 @@ 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