Messages in this thread Patch in this message | | | From | Jing Zhang <> | Subject | [PATCH v5 3/3] docs: perf: Update metric usage for Alibaba's T-Head PMU driver | Date | Fri, 28 Jul 2023 15:09:35 +0800 |
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Alibaba's T-Head ali_drw PMU supports DDR bandwidth metrics. Update its usage in the documentation.
Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com> Acked-by: Ian Rogers <irogers@google.com> Reviewed-by: John Garry <john.g.garry@oracle.com> --- 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 11de998..7d84002 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 -- 1.8.3.1
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