From f849ce6baf467ea7fb9e68ae05d5d045f3aa89e8 Mon Sep 17 00:00:00 2001 From: Jing Zhang Date: Fri, 28 Jul 2023 15:09:35 +0800 Subject: [PATCH] perf docs: Update metric usage for Alibaba's T-Head PMU driver (arm64) Alibaba's T-Head ali_drw PMU supports DDR bandwidth metrics. Update its usage in the documentation. Reviewed-by: John Garry Signed-off-by: Jing Zhang Acked-by: Ian Rogers Cc: Namhyung Kim Cc: Shuai Xue Cc: Will Deacon Cc: Zhuo Song Cc: linux-arm-kernel@lists.infradead.org Cc: linux-doc@vger.kernel.org Link: https://lore.kernel.org/r/1690528175-2499-4-git-send-email-renyu.zj@linux.alibaba.com Signed-off-by: Arnaldo Carvalho de Melo --- Documentation/admin-guide/perf/alibaba_pmu.rst | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/admin-guide/perf/alibaba_pmu.rst b/Documentation/admin-guide/perf/alibaba_pmu.rst index 11de998bb480..7d840023903f 100644 --- a/Documentation/admin-guide/perf/alibaba_pmu.rst +++ b/Documentation/admin-guide/perf/alibaba_pmu.rst @@ -88,6 +88,11 @@ data bandwidth:: -e ali_drw_27080/hif_rmw/ \ -e ali_drw_27080/cycle/ -- sleep 10 +Example usage of counting all memory read/write bandwidth by metric:: + + perf stat -M ddr_read_bandwidth.all -- sleep 10 + perf stat -M ddr_write_bandwidth.all -- sleep 10 + The average DRAM bandwidth can be calculated as follows: - Read Bandwidth = perf_hif_rd * DDRC_WIDTH * DDRC_Freq / DDRC_Cycle