| From | Arnaldo Carvalho de Melo <> | Subject | [PATCH 03/30] perf record: Print event causing perf_event_open() to fail | Date | Mon, 24 Sep 2012 12:59:17 -0300 |
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From: Stephane Eranian <eranian@google.com>
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: Stephane 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@quad Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/builtin-record.c | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index c643ed6..2cb7434 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -297,8 +297,10 @@ try_again: } 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 && -- 1.7.1
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