[PATCH V1 3/4] perf vendor events: Add JSON metrics for imx8mq DDR Perf

[John Garry]

On 19/01/2021 02:56, Joakim Zhang wrote:
> index 000000000000..c3e9f89a4a4d
> --- /dev/null
> +++ b/tools/perf/pmu-events/arch/arm64/freescale/imx8mq/sys/metrics.json
> @@ -0,0 +1,26 @@
> +[
> +   {
> +	    "BriefDescription": "bandwidth usage for lpddr4 evk board",

Why mention the evk board specifically? Is this metric only specific to 
that board, and not all i.MX8MQ platforms?

Thanks,
John

> +	    "MetricName": "imx8mq_bandwidth_usage.lpddr4",
> +	    "MetricExpr": "(( imx8_ddr0 at read\\-cycles@ + imx8_ddr0 at write\\-cycles@ ) * 4 * 4 / duration_time) / (800 * 1000000 * 4 * 4)",
> +	    "ScaleUnit": "1e2%",
> +	    "Unit": "imx8_ddr",
> +	    "Compat": "i.MX8MQ"
> +   },