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author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-01-24 13:44:10 -0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-01-27 12:23:33 -0300 |
commit | ecc4c5614b24ee8ebaa35b834b5768dc9302ee3e (patch) | |
tree | 31817740c14db1542afc1d9eb11cf0619eaeff77 /tools/perf/builtin-help.c | |
parent | afc45cf52c93009f1f4432e50365ce294ba7a474 (diff) | |
download | op-kernel-dev-ecc4c5614b24ee8ebaa35b834b5768dc9302ee3e.zip op-kernel-dev-ecc4c5614b24ee8ebaa35b834b5768dc9302ee3e.tar.gz |
perf tools: Propagate perf_config() errors
Previously these were being ignored, sometimes silently.
Stop doing that, emitting debug messages and handling the errors.
Testing it:
$ cat ~/.perfconfig
cat: /home/acme/.perfconfig: No such file or directory
$ perf stat -e cycles usleep 1
Performance counter stats for 'usleep 1':
938,996 cycles:u
0.003813731 seconds time elapsed
$ perf top --stdio
Error:
You may not have permission to collect system-wide stats.
Consider tweaking /proc/sys/kernel/perf_event_paranoid,
<SNIP>
[ perf record: Captured and wrote 0.019 MB perf.data (7 samples) ]
[acme@jouet linux]$ perf report --stdio
# To display the perf.data header info, please use --header/--header-only options.
# Overhead Command Shared Object Symbol
# ........ ....... ................. .........................
71.77% usleep libc-2.24.so [.] _dl_addr
27.07% usleep ld-2.24.so [.] _dl_next_ld_env_entry
1.13% usleep [kernel.kallsyms] [k] page_fault
$
$ touch ~/.perfconfig
$ ls -la ~/.perfconfig
-rw-rw-r--. 1 acme acme 0 Jan 27 12:14 /home/acme/.perfconfig
$
$ perf stat -e instructions usleep 1
Performance counter stats for 'usleep 1':
244,610 instructions:u
0.000805383 seconds time elapsed
$
[root@jouet ~]# chown acme.acme ~/.perfconfig
[root@jouet ~]# perf stat -e cycles usleep 1
Warning: File /root/.perfconfig not owned by current user or root, ignoring it.
Performance counter stats for 'usleep 1':
937,615 cycles
0.000836931 seconds time elapsed
#
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-j2rq96so6xdqlr8p8rd6a3jx@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-help.c')
-rw-r--r-- | tools/perf/builtin-help.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c index 93da24a..aed0d84 100644 --- a/tools/perf/builtin-help.c +++ b/tools/perf/builtin-help.c @@ -447,11 +447,13 @@ int cmd_help(int argc, const char **argv, const char *prefix __maybe_unused) NULL }; const char *alias; - int rc = 0; + int rc; load_command_list("perf-", &main_cmds, &other_cmds); - perf_config(perf_help_config, &help_format); + rc = perf_config(perf_help_config, &help_format); + if (rc) + return rc; argc = parse_options_subcommand(argc, argv, builtin_help_options, builtin_help_subcommands, builtin_help_usage, 0); |