diff options
| -rw-r--r-- | tools/perf/Build | 1 | ||||
| -rw-r--r-- | tools/perf/Documentation/perf-kallsyms.txt | 24 | ||||
| -rw-r--r-- | tools/perf/builtin-help.c | 2 | ||||
| -rw-r--r-- | tools/perf/builtin-kallsyms.c | 67 | ||||
| -rw-r--r-- | tools/perf/builtin.h | 1 | ||||
| -rw-r--r-- | tools/perf/command-list.txt | 1 | ||||
| -rw-r--r-- | tools/perf/perf.c | 1 |
7 files changed, 96 insertions, 1 deletions
diff --git a/tools/perf/Build b/tools/perf/Build index b12d5d1..0b48806 100644 --- a/tools/perf/Build +++ b/tools/perf/Build @@ -7,6 +7,7 @@ perf-y += builtin-help.o perf-y += builtin-sched.o perf-y += builtin-buildid-list.o perf-y += builtin-buildid-cache.o +perf-y += builtin-kallsyms.o perf-y += builtin-list.o perf-y += builtin-record.o perf-y += builtin-report.o diff --git a/tools/perf/Documentation/perf-kallsyms.txt b/tools/perf/Documentation/perf-kallsyms.txt new file mode 100644 index 0000000..954ea9e --- /dev/null +++ b/tools/perf/Documentation/perf-kallsyms.txt @@ -0,0 +1,24 @@ +perf-kallsyms(1) +============== + +NAME +---- +perf-kallsyms - Searches running kernel for symbols + +SYNOPSIS +-------- +[verse] +'perf kallsyms <options> symbol_name[,symbol_name...]' + +DESCRIPTION +----------- +This command searches the running kernel kallsyms file for the given symbol(s) +and prints information about it, including the DSO, the kallsyms begin/end +addresses and the addresses in the ELF kallsyms symbol table (for symbols in +modules). + +OPTIONS +------- +-v:: +--verbose=:: + Increase verbosity level, showing details about symbol table loading, etc. diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c index 3bdb2c7..93da24a 100644 --- a/tools/perf/builtin-help.c +++ b/tools/perf/builtin-help.c @@ -434,7 +434,7 @@ int cmd_help(int argc, const char **argv, const char *prefix __maybe_unused) const char * const builtin_help_subcommands[] = { "buildid-cache", "buildid-list", "diff", "evlist", "help", "list", "record", "report", "bench", "stat", "timechart", "top", "annotate", - "script", "sched", "kmem", "lock", "kvm", "test", "inject", "mem", "data", + "script", "sched", "kallsyms", "kmem", "lock", "kvm", "test", "inject", "mem", "data", #ifdef HAVE_LIBELF_SUPPORT "probe", #endif diff --git a/tools/perf/builtin-kallsyms.c b/tools/perf/builtin-kallsyms.c new file mode 100644 index 0000000..224bfc4 --- /dev/null +++ b/tools/perf/builtin-kallsyms.c @@ -0,0 +1,67 @@ +/* + * builtin-kallsyms.c + * + * Builtin command: Look for a symbol in the running kernel and its modules + * + * Copyright (C) 2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com> + * + * Released under the GPL v2. (and only v2, not any later version) + */ +#include "builtin.h" +#include <linux/compiler.h> +#include <subcmd/parse-options.h> +#include "debug.h" +#include "machine.h" +#include "symbol.h" + +static int __cmd_kallsyms(int argc, const char **argv) +{ + int i; + struct machine *machine = machine__new_kallsyms(); + + if (machine == NULL) { + pr_err("Couldn't read /proc/kallsyms\n"); + return -1; + } + + for (i = 0; i < argc; ++i) { + struct map *map; + struct symbol *symbol = machine__find_kernel_function_by_name(machine, argv[i], &map); + + if (symbol == NULL) { + printf("%s: not found\n", argv[i]); + continue; + } + + printf("%s: %s %s %#" PRIx64 "-%#" PRIx64 " (%#" PRIx64 "-%#" PRIx64")\n", + symbol->name, map->dso->short_name, map->dso->long_name, + map->unmap_ip(map, symbol->start), map->unmap_ip(map, symbol->end), + symbol->start, symbol->end); + } + + machine__delete(machine); + return 0; +} + +int cmd_kallsyms(int argc, const char **argv, const char *prefix __maybe_unused) +{ + const struct option options[] = { + OPT_INCR('v', "verbose", &verbose, "be more verbose (show counter open errors, etc)"), + OPT_END() + }; + const char * const kallsyms_usage[] = { + "perf kallsyms [<options>] symbol_name", + NULL + }; + + argc = parse_options(argc, argv, options, kallsyms_usage, 0); + if (argc < 1) + usage_with_options(kallsyms_usage, options); + + symbol_conf.sort_by_name = true; + symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL); + if (symbol__init(NULL) < 0) + return -1; + + return __cmd_kallsyms(argc, argv); +} diff --git a/tools/perf/builtin.h b/tools/perf/builtin.h index 0bcf68e..b55f5be 100644 --- a/tools/perf/builtin.h +++ b/tools/perf/builtin.h @@ -23,6 +23,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix); int cmd_evlist(int argc, const char **argv, const char *prefix); int cmd_help(int argc, const char **argv, const char *prefix); int cmd_sched(int argc, const char **argv, const char *prefix); +int cmd_kallsyms(int argc, const char **argv, const char *prefix); int cmd_list(int argc, const char **argv, const char *prefix); int cmd_record(int argc, const char **argv, const char *prefix); int cmd_report(int argc, const char **argv, const char *prefix); diff --git a/tools/perf/command-list.txt b/tools/perf/command-list.txt index ab5cbaa..fb45613 100644 --- a/tools/perf/command-list.txt +++ b/tools/perf/command-list.txt @@ -12,6 +12,7 @@ perf-diff mainporcelain common perf-config mainporcelain common perf-evlist mainporcelain common perf-inject mainporcelain common +perf-kallsyms mainporcelain common perf-kmem mainporcelain common perf-kvm mainporcelain common perf-list mainporcelain common diff --git a/tools/perf/perf.c b/tools/perf/perf.c index aa23b33..13c8a7d 100644 --- a/tools/perf/perf.c +++ b/tools/perf/perf.c @@ -47,6 +47,7 @@ static struct cmd_struct commands[] = { { "diff", cmd_diff, 0 }, { "evlist", cmd_evlist, 0 }, { "help", cmd_help, 0 }, + { "kallsyms", cmd_kallsyms, 0 }, { "list", cmd_list, 0 }, { "record", cmd_record, 0 }, { "report", cmd_report, 0 }, |
