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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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7a6f205d62
Try first reading the build id, validating that it is an ELF file, etc. Cheap as libelf will bail out as soon as the magic number check fails. Useful when investigating debuginfo packaging problems like this one: [root@emilia ~]# perf buildid-list -i /usr/lib/debug/lib/modules/`uname -r`/vmlinux 77bb4ea591a602d455ace759a377c9adfff1aba3 [root@emilia ~]# perf buildid-list -k 07b0c016a2b30004e86132d0239945b1e88f5d75 [root@emilia ~]# Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-4elot9oxwa0rr0d90dshca3a@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/*
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* builtin-buildid-list.c
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*
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* Builtin buildid-list command: list buildids in perf.data, in the running
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* kernel and in ELF files.
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*
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* Copyright (C) 2009, Red Hat Inc.
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* Copyright (C) 2009, Arnaldo Carvalho de Melo <acme@redhat.com>
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*/
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#include "builtin.h"
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#include "perf.h"
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#include "util/build-id.h"
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#include "util/cache.h"
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#include "util/debug.h"
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#include "util/parse-options.h"
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#include "util/session.h"
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#include "util/symbol.h"
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#include <libelf.h>
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static char const *input_name = "perf.data";
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static bool force;
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static bool show_kernel;
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static bool with_hits;
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static const char * const buildid_list_usage[] = {
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"perf buildid-list [<options>]",
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NULL
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};
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static const struct option options[] = {
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OPT_BOOLEAN('H', "with-hits", &with_hits, "Show only DSOs with hits"),
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OPT_STRING('i', "input", &input_name, "file",
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"input file name"),
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OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
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OPT_BOOLEAN('k', "kernel", &show_kernel, "Show current kernel build id"),
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OPT_INCR('v', "verbose", &verbose,
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"be more verbose"),
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OPT_END()
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};
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static int perf_session__list_build_ids(void)
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{
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struct perf_session *session;
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session = perf_session__new(input_name, O_RDONLY, force, false,
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&build_id__mark_dso_hit_ops);
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if (session == NULL)
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return -1;
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if (with_hits)
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perf_session__process_events(session, &build_id__mark_dso_hit_ops);
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perf_session__fprintf_dsos_buildid(session, stdout, with_hits);
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perf_session__delete(session);
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return 0;
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}
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static int sysfs__fprintf_build_id(FILE *fp)
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{
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u8 kallsyms_build_id[BUILD_ID_SIZE];
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char sbuild_id[BUILD_ID_SIZE * 2 + 1];
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if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
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sizeof(kallsyms_build_id)) != 0)
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return -1;
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build_id__sprintf(kallsyms_build_id, sizeof(kallsyms_build_id),
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sbuild_id);
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fprintf(fp, "%s\n", sbuild_id);
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return 0;
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}
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static int filename__fprintf_build_id(const char *name, FILE *fp)
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{
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u8 build_id[BUILD_ID_SIZE];
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char sbuild_id[BUILD_ID_SIZE * 2 + 1];
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if (filename__read_build_id(name, build_id,
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sizeof(build_id)) != sizeof(build_id))
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return 0;
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build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
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return fprintf(fp, "%s\n", sbuild_id);
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}
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static int __cmd_buildid_list(void)
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{
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if (show_kernel)
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return sysfs__fprintf_build_id(stdout);
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elf_version(EV_CURRENT);
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/*
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* See if this is an ELF file first:
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*/
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if (filename__fprintf_build_id(input_name, stdout))
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return 0;
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return perf_session__list_build_ids();
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}
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int cmd_buildid_list(int argc, const char **argv, const char *prefix __used)
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{
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argc = parse_options(argc, argv, options, buildid_list_usage, 0);
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setup_pager();
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return __cmd_buildid_list();
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}
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