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| author | Martin Liška <mliska@suse.cz> | 2022-08-12 13:40:49 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-08-12 10:27:21 -0300 |
| commit | 1bf7d836e57ba4943e33e163e730cd77ab837572 (patch) | |
| tree | 2534928a646d7cdc91302f4f8d24b5fbd51ca1f0 | |
| parent | a072a7a0263ddc723305dfd975f931bcea4e4f5b (diff) | |
| download | linux-1bf7d836e57ba4943e33e163e730cd77ab837572.tar.gz | |
perf record: Improve error message of -p not_existing_pid
When one uses -p $not_existing_pid, the output of --help is printed:
$ perf record -p 123456789 2>&1 | head -n3
Usage: perf record [<options>] [<command>]
or: perf record [<options>] -- <command> [<options>]
Let's change it something similar what perf top -p $not_existing_pid
prints:
$ ./perf top -p 123456789 --stdio
Error:
Couldn't create thread/CPU maps: No such process
Newly suggested error message:
$ ./perf record -p 123456789
Couldn't create thread/CPU maps: No such process
Signed-off-by: Martin Liška <mliska@suse.cz>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: http://lore.kernel.org/lkml/8e00eda1-4de0-2c44-ce67-d4df48ac1f7c@suse.cz
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/builtin-record.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index cf5c5379ceaa3..4713f0f3a6cf1 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -3996,8 +3996,15 @@ int cmd_record(int argc, const char **argv) arch__add_leaf_frame_record_opts(&rec->opts); err = -ENOMEM; - if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0) - usage_with_options(record_usage, record_options); + if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0) { + if (rec->opts.target.pid != NULL) { + pr_err("Couldn't create thread/CPU maps: %s\n", + errno == ENOENT ? "No such process" : str_error_r(errno, errbuf, sizeof(errbuf))); + goto out; + } + else + usage_with_options(record_usage, record_options); + } err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts); if (err) |