Messages in this thread Patch in this message | | | From | Yann Droneaud <> | Date | Thu, 1 Oct 2015 17:18:57 +0200 | Subject | [PATCH v2 2/2] perf tools: report PERF_FLAG_FD_CLOEXEC probing error once |
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In case of failure, unrelated to PERF_FLAG_FD_CLOEXEC, perf_flag_probe() reports the error twice. For example:
$ perf record ls Error: perf_event_open(..., PERF_FLAG_FD_CLOEXEC) failed with unexpected error 16 (Device or resource busy) perf_event_open(..., 0) failed unexpectedly with error 16 (Device or resource busy)
There's no need for the second error message, so this patch changes the function to only report a second error message when the two calls to perf_even_open(2) fail with different error codes.
Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: William Cohen <wcohen@redhat.com> Link: http://lkml.kernel.org/r/cover.1443708092.git.ydroneaud@opteya.com Reported-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Yann Droneaud <ydroneaud@opteya.com> --- tools/perf/util/cloexec.c | 25 +++++++++++++------------ 1 file changed, 13 insertions(+), 12 deletions(-)
diff --git a/tools/perf/util/cloexec.c b/tools/perf/util/cloexec.c index be226d293c91..552528698566 100644 --- a/tools/perf/util/cloexec.c +++ b/tools/perf/util/cloexec.c @@ -26,7 +26,7 @@ static int perf_flag_probe(void) .exclude_kernel = 1, }; int fd; - int err; + int err0, err1; int cpu; pid_t pid = -1; char sbuf[STRERR_BUFSIZE]; @@ -49,7 +49,7 @@ static int perf_flag_probe(void) } break; } - err = errno; + err0 = errno; if (fd >= 0) { close(fd); @@ -57,12 +57,12 @@ static int perf_flag_probe(void) } /* ignore busy errors */ - if (err == EBUSY) + if (err0 == EBUSY) return -1; - WARN_ONCE(err != EINVAL, + WARN_ONCE(err0 != EINVAL, "perf_event_open(..., PERF_FLAG_FD_CLOEXEC) failed with unexpected error %d (%s)\n", - err, strerror_r(err, sbuf, sizeof(sbuf))); + err0, strerror_r(err0, sbuf, sizeof(sbuf))); /* not supported, confirm error related to PERF_FLAG_FD_CLOEXEC */ while (1) { @@ -73,17 +73,18 @@ static int perf_flag_probe(void) } break; } - err = errno; + err1 = errno; - if (fd >= 0) + if (fd >= 0) { close(fd); + return 0; + } - if (WARN_ONCE(fd < 0, - "perf_event_open(..., 0) failed unexpectedly with error %d (%s)\n", - err, strerror_r(err, sbuf, sizeof(sbuf)))) - return -1; + WARN_ONCE(err0 != err1, + "perf_event_open(..., 0) failed unexpectedly with error %d (%s)\n", + err1, strerror_r(err1, sbuf, sizeof(sbuf))); - return 0; + return -1; } unsigned long perf_event_open_cloexec_flag(void) -- 2.4.3
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