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perf buildid-list: Add option to show the running kernel build id

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[root@emilia ~]# perf buildid-list -k
07b0c016a2b30004e86132d0239945b1e88f5d75

Useful when diagnosing build id problems in debuginfo packages, etc.

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-po1bl7acn6e1hhne90opmvtl@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
2011-08-29 08:07:22 -03:00
parent 63e03724b5
commit f2add9cd66
2 changed files with 34 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
tools/perf/builtin-buildid-list.c
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@@ -1,7 +1,8 @@
/*
* builtin-buildid-list.c
*
* Builtin buildid-list command: list buildids in perf.data
* Builtin buildid-list command: list buildids in perf.data or in the running
* kernel.
*
* Copyright (C) 2009, Red Hat Inc.
* Copyright (C) 2009, Arnaldo Carvalho de Melo <acme@redhat.com>
@@ -17,6 +18,7 @@
static char const *input_name = "perf.data";
static bool force;
static bool show_kernel;
static bool with_hits;
static const char * const buildid_list_usage[] = {
@@ -29,12 +31,13 @@ static const struct option options[] = {
OPT_STRING('i', "input", &input_name, "file",
"input file name"),
OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
OPT_BOOLEAN('k', "kernel", &show_kernel, "Show current kernel build id"),
OPT_INCR('v', "verbose", &verbose,
"be more verbose"),
OPT_END()
};
static int __cmd_buildid_list(void)
static int perf_session__list_build_ids(void)
{
struct perf_session *session;
@@ -52,6 +55,30 @@ static int __cmd_buildid_list(void)
return 0;
}
static int sysfs__fprintf_build_id(FILE *fp)
{
u8 kallsyms_build_id[BUILD_ID_SIZE];
char sbuild_id[BUILD_ID_SIZE * 2 + 1];
if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
sizeof(kallsyms_build_id)) != 0)
return -1;
build_id__sprintf(kallsyms_build_id, sizeof(kallsyms_build_id),
sbuild_id);
fprintf(fp, "%s\n", sbuild_id);
return 0;
}
static int __cmd_buildid_list(void)
{
if (show_kernel)
return sysfs__fprintf_build_id(stdout);
return perf_session__list_build_ids();
}
int cmd_buildid_list(int argc, const char **argv, const char *prefix __used)
{
argc = parse_options(argc, argv, options, buildid_list_usage, 0);