On 11/11/13, 1:22 PM, Arnaldo Carvalho de Melo wrote:
@@ -58,8 +58,11 @@ static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
}
if (perf_evlist__open(evlist)) {
+ const char *knob =
"/proc/sys/kernel/perf_event_max_sample_rate";
+
err = -errno;
- pr_debug("Couldn't open evlist: %s\n", strerror(errno));
+ pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64
" in this test.\n",
+ strerror(errno), knob, (u64)attr.sample_freq);
goto out_delete_maps;
}
Jiri had a patch to drop the sample rate to max. Perhaps re-use that here?
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