diff mbox series

[v3,7/7] docs: perf: Update metric usage for Alibaba's T-Head PMU driver

Message ID 1685438374-33287-8-git-send-email-renyu.zj@linux.alibaba.com
State New
Headers
Series Add JSON metrics for arm CMN and Yitian710 DDR |

Commit Message

Jing Zhang May 30, 2023, 9:19 a.m. UTC 
  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>
---
 Documentation/admin-guide/perf/alibaba_pmu.rst | 5 +++++
 1 file changed, 5 insertions(+)

Comments

Ian Rogers May 31, 2023, 1:19 a.m. UTC | #1 
On Tue, May 30, 2023 at 2:19 AM Jing Zhang <renyu.zj@linux.alibaba.com> wrote:
>
> 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>

Thanks,
Ian

> ---
>  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
>
diff mbox series

Patch

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