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Commit 5a7ed29c authored by Robert Richter's avatar Robert Richter Committed by Arnaldo Carvalho de Melo
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perf record: Use sw counter only if hw pmu is not detected 

Use cpu-clock-tick sw counter for cpu-cycles only if there is no hw
pmu available. This is the case if the syscall reports ENOENT. In
other cases (e.g. invalid attributes) we don't want the sw counter to
be used.

Cc: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/1333643188-26895-5-git-send-email-robert.richter@amd.com


Signed-off-by: default avatarRobert Richter <robert.richter@amd.com>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 61d5bf5b

tools/perf/builtin-record.c

+1 −1
Original line number Diff line number Diff line
@@ -245,7 +245,7 @@ static void perf_record__open(struct perf_record *rec) 
			 * based cpu-clock-tick sw counter, which

			 * is always available even if no PMU support:

			 */

			if (attr->type == PERF_TYPE_HARDWARE

			if (err == ENOENT && attr->type == PERF_TYPE_HARDWARE

					&& attr->config == PERF_COUNT_HW_CPU_CYCLES) {



				if (verbose)