linux-kernel - Re: [PATCH 10/10] perf tests: Use lower sample

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Date:	Mon, 11 Nov 2013 13:45:12 -0700
From:	David Ahern <dsahern@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...nel.org>
CC:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 10/10] perf tests: Use lower sample_freq in sw clock event
 period test

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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