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2e2ba7d1ea
Some Arm64 PMUs expose 'caps/slots' as 0 when the slot count is not implemented, tool_pmu__read_event() currently returns false for this, so metrics that reference #slots are reported as syntax error. Since the commit3a61fd866e("perf expr: Return -EINVAL for syntax error in expr__find_ids()"), these syntax errors are populated as failures and make the PMU metric test fail: 9.3: Parsing of PMU event table metrics: --- start --- ... Found metric 'backend_bound' metric expr 100 * (stall_slot_backend / (#slots * cpu_cycles)) for backend_bound parsing metric: 100 * (stall_slot_backend / (#slots * cpu_cycles)) Failure to read '#slots' literal: #slots = nan syntax error Fail to parse metric or group `backend_bound' ... ---- end(-1) ---- 9.3: Parsing of PMU event table metrics : FAILED! This commit introduces a new function is_expected_broken_metric() to identify broken metrics, and treats metrics containing "#slots" as expected broken when #slots == 0 on Arm64 platforms. Fixes:3a61fd866e("perf expr: Return -EINVAL for syntax error in expr__find_ids()") Reviewed-by: Ian Rogers <irogers@google.com> Reviewed-by: James Clark <james.clark@linaro.org> Signed-off-by: Leo Yan <leo.yan@arm.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>