Commit id 'b00d7f29' shifted the opening of the /sys/devices/intel_cqm/type file from event enable to perf event initialization. If the file did not exist, then an error would be written to the domain log: 2016-09-06 20:51:21.677+0000: 7310: error : virFileReadAll:1360 : Failed to open file '/sys/devices/intel_cqm/type': No such file or directory Since the error is now handled in virPerfEventEnable by checking if the event_attr->attrType == 0 for CMT, MBML, and MBMT events - we can just use the Quiet API in order to not log the error we're going to throw away. Additionally, rather than using virReportSystemError, use virReportError and VIR_ERR_ARGUMENT_UNSUPPORTED in order to signify that support isn't there for that type of perf event - adjust the error message as well. Signed-off-by: John Ferlan <jferlan(a)redhat.com&gt; --- src/util/virperf.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/src/util/virperf.c b/src/util/virperf.c index cd66b05..a65a4bf 100644 --- a/src/util/virperf.c +++ b/src/util/virperf.c @@ -116,7 +116,7 @@ virPerfRdtAttrInit(void) char *tmp = NULL; unsigned int attr_type = 0; - if (virFileReadAll("/sys/devices/intel_cqm/type", 10, &buf) < 0) + if (virFileReadAllQuiet("/sys/devices/intel_cqm/type", 10, &buf) < 0) goto error; if ((tmp = strchr(buf, '\n'))) @@ -174,9 +174,9 @@ virPerfEventEnable(virPerfPtr perf, if (event_attr->attrType == 0 && (type == VIR_PERF_EVENT_CMT || type == VIR_PERF_EVENT_MBMT || type == VIR_PERF_EVENT_MBML)) { - virReportSystemError(errno, - _("Unable to open perf event for %s"), - virPerfEventTypeToString(event->type)); + virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED, + _("unable to enable perf event for %s"), + virPerfEventTypeToString(event->type)); return -1; } -- 2.7.4