diff options
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/builtin-trace.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index c907e7e41a7..c3caabbe18f 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -298,7 +298,22 @@ static struct syscall *trace__syscall_info(struct trace *trace, int id = perf_evsel__intval(evsel, sample, "id"); if (id < 0) { - fprintf(trace->output, "Invalid syscall %d id, skipping...\n", id); + + /* + * XXX: Noticed on x86_64, reproduced as far back as 3.0.36, haven't tried + * before that, leaving at a higher verbosity level till that is + * explained. Reproduced with plain ftrace with: + * + * echo 1 > /t/events/raw_syscalls/sys_exit/enable + * grep "NR -1 " /t/trace_pipe + * + * After generating some load on the machine. + */ + if (verbose > 1) { + static u64 n; + fprintf(trace->output, "Invalid syscall %d id, skipping (%s, %" PRIu64 ") ...\n", + id, perf_evsel__name(evsel), ++n); + } return NULL; } |