提交 1863fbbb 编写于 作者: S Stephane Eranian 提交者: Arnaldo Carvalho de Melo

perf record: Print event causing perf_event_open() to fail

Got tired of not getting the event that caused the perf_event_open()
syscall to fail. So I fixed the error message. This is very useful when
monitoring lots of events in a single run.
Signed-off-by: NStephane Eranian <eranian@google.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20120920161945.GA7064@quadSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
上级 8f28f19a
......@@ -297,8 +297,10 @@ static int perf_record__open(struct perf_record *rec)
}
printf("\n");
error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n",
err, strerror(err));
error("sys_perf_event_open() syscall returned with %d "
"(%s) for event %s. /bin/dmesg may provide "
"additional information.\n",
err, strerror(err), perf_evsel__name(pos));
#if defined(__i386__) || defined(__x86_64__)
if (attr->type == PERF_TYPE_HARDWARE &&
......
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