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charset="utf-8" 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 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 siz= e, struct syscall_arg *arg return syscall_arg__scnprintf_hex(bf, size, arg); } =20 +size_t syscall_arg__scnprintf_ksym(char *bf, size_t size, struct syscall_a= rg *arg) +{ + if (arg->val =3D=3D 0) + return scnprintf(bf, size, "NULL"); + + if (arg->trace && arg->trace->host) { + struct map *map; + struct symbol *sym =3D machine__find_kernel_symbol(arg->trace->host, + arg->val, &map); + + if (sym) { + u64 start =3D map__unmap_ip(map, sym->start); + u64 offset =3D arg->val - start; + + if (offset =3D=3D 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_ar= g *arg) { return scnprintf(bf, size, "%d", arg->val); diff --git a/tools/perf/trace/beauty/beauty.h b/tools/perf/trace/beauty/bea= uty.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_ar= g *arg); #define SCA_PTR syscall_arg__scnprintf_ptr =20 +size_t syscall_arg__scnprintf_ksym(char *bf, size_t size, struct syscall_a= rg *arg); +#define SCA_KSYM syscall_arg__scnprintf_ksym + size_t syscall_arg__scnprintf_int(char *bf, size_t size, struct syscall_ar= g *arg); #define SCA_INT syscall_arg__scnprintf_int =20 --=20 2.55.0 From nobody Fri Oct 2 07:45:22 2026 Received: from LO3P265CU004.outbound.protection.outlook.com (mail-uksouthazon11020117.outbound.protection.outlook.com [52.101.196.117]) (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 62A9D3B47C4; 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Enhance syscall_arg_fmt__init_array() to automatically detect these fields by name and type signature (e.g., typedefs ending with '_func_t' or '_fn', or C function pointer types containing '(*)') and assign 'SCA_KSYM' as their default beautifier. Additionally, register common function pointer field names within the sorted 'syscall_arg_fmts__by_name' lookup table. This ensures tracepoint arguments such as 'workqueue:workqueue_execute_start.function' are symbolised automatically without requiring explicit per-event configuration. For example: =E2=9D=AF sudo tools/perf/perf trace --event workqueue:workqueue_execut= e_end --max-events 2 --show-cpu 0.000 [000] kworker/u32:15/236682 workqueue:workqueue_execute_end(= work: 0xffffffffab2f1420, function: toggle_allocation_gate) 0.132 [000] kworker/u32:15/236682 workqueue:workqueue_execute_end(= work: 0xffff8ac2c1adc010, function: flush_to_ldisc) Signed-off-by: Aaron Tomlin --- tools/perf/builtin-trace.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index cbc5bdc0cc12..d3401b64340a 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -2090,8 +2090,13 @@ static int syscall__alloc_arg_fmts(struct syscall *s= c, int nr_args) } =20 static const struct syscall_arg_fmt syscall_arg_fmts__by_name[] =3D { + { .name =3D "action", .scnprintf =3D SCA_KSYM, }, + { .name =3D "callsite", .scnprintf =3D SCA_KSYM, }, + { .name =3D "fn", .scnprintf =3D SCA_KSYM, }, + { .name =3D "function", .scnprintf =3D SCA_KSYM, }, { .name =3D "msr", .scnprintf =3D SCA_X86_MSR, .strtoul =3D STUL_X86_MS= R, }, { .name =3D "vector", .scnprintf =3D SCA_X86_IRQ_VECTORS, .strtoul =3D ST= UL_X86_IRQ_VECTORS, }, + { .name =3D "work", .scnprintf =3D SCA_KSYM, }, }; =20 static int syscall_arg_fmt__cmp(const void *name, const void *fmtp) @@ -2192,6 +2197,14 @@ syscall_arg_fmt__init_array(struct syscall_arg_fmt *= arg, struct tep_format_field ((len >=3D 4 && strcmp(field->name + len - 4, "name") =3D=3D 0) || strstr(field->name, "path") !=3D NULL)) { arg->scnprintf =3D SCA_FILENAME; + } else if (strcmp(field->name, "fn") =3D=3D 0 || + strcmp(field->name, "function") =3D=3D 0 || + strcmp(field->name, "callsite") =3D=3D 0 || + strcmp(field->name, "action") =3D=3D 0 || + (field->type && (strstr(field->type, "(*)") !=3D NULL || + strstr(field->type, "_func_t") !=3D NULL || + strstr(field->type, "_fn") !=3D NULL))) { + arg->scnprintf =3D SCA_KSYM; } else if ((field->flags & TEP_FIELD_IS_POINTER) || strstr(field->name, = "addr") || field_has_hex_fmt(field, len)) arg->scnprintf =3D SCA_PTR; --=20 2.55.0 From nobody Fri Oct 2 07:45:22 2026 Received: from CWXP265CU008.outbound.protection.outlook.com (mail-ukwestazon11020091.outbound.protection.outlook.com [52.101.195.91]) (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 849A83B47C4; 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charset="utf-8" When BTF (BPF Type Format) metadata is loaded from vmlinux, 'perf trace' can inspect the precise C types of tracepoint and system call parameters. However, function pointer arguments are currently not recognised during BTF pretty-printing and default to hexadecimal output. Introduce btf_is_func_ptr() to inspect BTF type hierarchies (i.e., traversing pointers, typedefs, and type modifiers) to determine whether a parameter resolves to a function prototype ('BTF_KIND_FUNC_PROTO'). Generalise BTF type caching via syscall_arg_fmt__cache_btf_type() to handle structs, unions, enums, and function pointers alike. When a field is identified as a kernel function pointer, trace__btf_scnprintf() routes its value to syscall_arg__scnprintf_ksym(), enabling automatic zero-config symbolisation of kernel function pointers whenever BTF is available. Signed-off-by: Aaron Tomlin --- tools/perf/builtin-trace.c | 39 ++++++++++++++++++++++++++++++-------- 1 file changed, 31 insertions(+), 8 deletions(-) diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index d3401b64340a..60dddcf93ed0 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -973,21 +973,43 @@ static size_t syscall_arg__scnprintf_getrandom_flags(= char *bf, size_t size, #define SCA_GETRANDOM_FLAGS syscall_arg__scnprintf_getrandom_flags =20 #ifdef HAVE_LIBBPF_SUPPORT -static void syscall_arg_fmt__cache_btf_enum(struct syscall_arg_fmt *arg_fm= t, struct btf *btf, char *type) +static bool btf_is_func_ptr(const struct btf *btf, const struct btf_type *= type) +{ + while (type) { + if (btf_is_ptr(type)) { + type =3D btf__type_by_id(btf, type->type); + return type && btf_is_func_proto(type); + } + if (btf_is_typedef(type) || btf_is_mod(type)) { + type =3D btf__type_by_id(btf, type->type); + } else { + break; + } + } + return false; +} + +static void syscall_arg_fmt__cache_btf_type(struct syscall_arg_fmt *arg_fm= t, + struct btf *btf, char *type) { int id; =20 - type =3D strstr(type, "enum "); if (type =3D=3D NULL) return; =20 - type +=3D 5; // skip "enum " to get the enumeration name + if (strstarts(type, "enum ")) + type +=3D 5; + else if (strstarts(type, "struct ")) + type +=3D 7; + else if (strstarts(type, "union ")) + type +=3D 6; =20 id =3D btf__find_by_name(btf, type); if (id < 0) return; =20 arg_fmt->type =3D btf__type_by_id(btf, id); + arg_fmt->type_id =3D id; } =20 static bool syscall_arg__strtoul_btf_enum(char *bf, size_t size, struct sy= scall_arg *arg, u64 *val) @@ -1022,8 +1044,7 @@ static bool syscall_arg__strtoul_btf_type(char *bf, s= ize_t size, struct syscall_ return false; =20 if (arg->fmt->type =3D=3D NULL) { - // See if this is an enum - syscall_arg_fmt__cache_btf_enum(arg->fmt, btf, type); + syscall_arg_fmt__cache_btf_type(arg->fmt, btf, type); } =20 // Now let's see if we have a BTF type resolved @@ -1110,8 +1131,7 @@ static size_t trace__btf_scnprintf(struct trace *trac= e, struct syscall_arg *arg, return 0; =20 if (arg_fmt->type =3D=3D NULL) { - // Check if this is an enum and if we have the BTF type for it. - syscall_arg_fmt__cache_btf_enum(arg_fmt, trace->btf, type); + syscall_arg_fmt__cache_btf_type(arg_fmt, trace->btf, type); } =20 // Did we manage to find a BTF type for the syscall/tracepoint argument? @@ -1122,6 +1142,8 @@ static size_t trace__btf_scnprintf(struct trace *trac= e, struct syscall_arg *arg, return btf_enum_scnprintf(arg_fmt->type, trace->btf, bf, size, val); else if (btf_is_struct(arg_fmt->type) || btf_is_union(arg_fmt->type)) return btf_struct_scnprintf(arg_fmt->type, trace->btf, bf, size, arg); + else if (btf_is_func_ptr(trace->btf, arg_fmt->type)) + return syscall_arg__scnprintf_ksym(bf, size, arg); =20 return 0; } @@ -2565,7 +2587,8 @@ static size_t syscall__scnprintf_args(struct syscall = *sc, char *bf, size_t size, =20 default_scnprintf =3D sc->arg_fmt[arg.idx].scnprintf; =20 - if (trace->force_btf || default_scnprintf =3D=3D NULL || default_scnpri= ntf =3D=3D SCA_PTR) { + if (trace->force_btf || default_scnprintf =3D=3D NULL || + default_scnprintf =3D=3D SCA_PTR || default_scnprintf =3D=3D SCA_KS= YM) { btf_printed =3D trace__btf_scnprintf(trace, &arg, bf + printed, size - printed, val, field->type); if (btf_printed) { --=20 2.55.0