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From:   Heiko =?ISO-8859-1?Q?St=FCbner?= <heiko@sntech.de>
To:     linux-rockchip@lists.infradead.org,
        Sascha Hauer <s.hauer@pengutronix.de>
Cc:     linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-pm@vger.kernel.org, Chanwoo Choi <chanwoo@kernel.org>,
        Kyungmin Park <kyungmin.park@samsung.com>,
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        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>, devicetree@vger.kernel.org,
        Sebastian Reichel <sebastian.reichel@collabora.com>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Chanwoo Choi <cw00.choi@samsung.com>
Subject: Re: [PATCH v8 16/26] PM / devfreq: rockchip-dfi: Add perf support
Date:   Wed, 18 Oct 2023 22:03:04 +0200
Message-ID: <27832786.gRfpFWEtPU@diego>
In-Reply-To: <20231018061714.3553817-17-s.hauer@pengutronix.de>
References: <20231018061714.3553817-1-s.hauer@pengutronix.de>
 <20231018061714.3553817-17-s.hauer@pengutronix.de>
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Am Mittwoch, 18. Oktober 2023, 08:17:04 CEST schrieb Sascha Hauer:
> The DFI is a unit which is suitable for measuring DDR utilization, but
> so far it could only be used as an event driver for the DDR frequency
> scaling driver. This adds perf support to the DFI driver.
> 
> Usage with the 'perf' tool can look like:
> 
> perf stat -a -e rockchip_ddr/cycles/,\
> 		rockchip_ddr/read-bytes/,\
> 		rockchip_ddr/write-bytes/,\
> 		rockchip_ddr/bytes/ sleep 1
> 
>  Performance counter stats for 'system wide':
> 
>         1582524826      rockchip_ddr/cycles/
>            1802.25 MB   rockchip_ddr/read-bytes/
>            1793.72 MB   rockchip_ddr/write-bytes/
>            3595.90 MB   rockchip_ddr/bytes/
> 
>        1.014369709 seconds time elapsed
> 
> perf support has been tested on a RK3568 and a RK3399, the latter with
> dual channel DDR.
> 
> Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Acked-by: Heiko Stuebner <heiko@sntech.de>