diff mbox series

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

Message ID 1687245156-61215-5-git-send-email-renyu.zj@linux.alibaba.com (mailing list archive)
State New, archived
Headers show
Series Add JSON metrics for Yitian710 DDR | expand

Commit Message

Jing Zhang June 20, 2023, 7:12 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>
Acked-by: Ian Rogers <irogers@google.com>
---
 Documentation/admin-guide/perf/alibaba_pmu.rst | 5 +++++
 1 file changed, 5 insertions(+)

Comments

John Garry June 20, 2023, 7:30 a.m. UTC | #1 
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<renyu.zj@linux.alibaba.com>
> Acked-by: Ian Rogers<irogers@google.com>

Reviewed-by: John Garry <john.g.garry@oracle.com>
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