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Date: Mon, 11 Nov 2013 13:45:12 -0700
From: David Ahern <dsahern@gmail.com>
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To: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
        Ingo Molnar <mingo@kernel.org>
CC: linux-kernel@vger.kernel.org, Arnaldo Carvalho de Melo <acme@redhat.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Frederic Weisbecker <fweisbec@gmail.com>, Jiri Olsa <jolsa@redhat.com>,
        Mike Galbraith <efault@gmx.de>, Namhyung Kim <namhyung@kernel.org>,
        Paul Mackerras <paulus@samba.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH 10/10] perf tests: Use lower sample_freq in sw clock event
 period test
References: <1384201353-23863-1-git-send-email-acme@infradead.org> <1384201353-23863-11-git-send-email-acme@infradead.org>
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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?