The following message will be returned to user when executing 'perf report --time' if perf data file doesn't contain the first/last sample time.
"HINT: no first/last sample time found in perf data. Please use latest perf binary to execute 'perf record' (if '--buildid-all' is enabled, needs to set '--timestamp-boundary')." Signed-off-by: Jin Yao <yao....@linux.intel.com> --- tools/perf/builtin-report.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c index dd4df9a..a6c5cf2 100644 --- a/tools/perf/builtin-report.c +++ b/tools/perf/builtin-report.c @@ -1299,7 +1299,9 @@ int cmd_report(int argc, const char **argv) if (perf_time__parse_str(report.ptime_range, report.time_str) != 0) { if (session->evlist->first_sample_time == 0 && session->evlist->last_sample_time == 0) { - pr_err("No first/last sample time in perf data\n"); + pr_err("HINT: no first/last sample time found in perf data.\n" + "Please use latest perf binary to execute 'perf record'\n" + "(if '--buildid-all' is enabled, please set '--timestamp-boundary').\n"); return -EINVAL; } -- 2.7.4