linux-kernel - Re: [PATCH V7 12/14] perf, tools, stat: Support new per thread TopDown metrics

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Message-ID: <20200724032923.GB1180481@tassilo.jf.intel.com>
Date:   Thu, 23 Jul 2020 20:29:23 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     kan.liang@...ux.intel.com
Cc:     peterz@...radead.org, acme@...hat.com, mingo@...nel.org,
        linux-kernel@...r.kernel.org, jolsa@...nel.org, eranian@...gle.com,
        alexander.shishkin@...ux.intel.com, like.xu@...ux.intel.com
Subject: Re: [PATCH V7 12/14] perf, tools, stat: Support new per thread
 TopDown metrics

> +		if (topdown_metric_attrs[0] && str) {`
> +			if (!stat_config.interval) {
> +				fprintf(stat_config.output,
> +					"Topdown accuracy may decreases when measuring long period.\n"
> +					"Please print the result regularly, e.g. -I1000\n");

Can you disable this warning when --metrics-only is used? In this case it doesn't matter
because the error is proportional to the percentage accuracy and should be invisible.

You can only see a difference when looking at the expanded counts.

-andi