2023-06-20 07:21:06

by Jing Zhang

Subject: [PATCH v4 4/4] docs: perf: Update metric usage for Alibaba's T-Head PMU driver

Alibaba's T-Head ali_drw PMU supports DDR bandwidth metrics. Update
its usage in the documentation.

Signed-off-by: Jing Zhang <[email protected]>
Acked-by: Ian Rogers <[email protected]>
---
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

2023-06-20 07:43:34

by John Garry

Subject: Re: [PATCH v4 4/4] docs: perf: Update metric usage for Alibaba's T-Head PMU driver

On 20/06/2023 08:12, Jing Zhang wrote:
> Alibaba's T-Head ali_drw PMU supports DDR bandwidth metrics. Update
> its usage in the documentation.
>
> Signed-off-by: Jing Zhang<[email protected]>
> Acked-by: Ian Rogers<[email protected]>

Reviewed-by: John Garry <[email protected]>