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| author | Jing Zhang <renyu.zj@linux.alibaba.com> | 2023-07-28 09:09:35 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2023-07-29 00:01:17 +0200 |
| commit | f849ce6baf467ea7fb9e68ae05d5d045f3aa89e8 (patch) | |
| tree | c0e25e40473d0978ed028025b7963a9583932d74 /Documentation | |
| parent | perf vendor events arm64: Add JSON metrics for Yitian 710 DDR (diff) | |
| download | linux-f849ce6baf467ea7fb9e68ae05d5d045f3aa89e8.tar.xz linux-f849ce6baf467ea7fb9e68ae05d5d045f3aa89e8.zip | |
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 <john.g.garry@oracle.com>
Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Shuai Xue <xueshuai@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Cc: Zhuo Song <zhuo.song@linux.alibaba.com>
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 <acme@redhat.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/perf/alibaba_pmu.rst | 5 |
1 files changed, 5 insertions, 0 deletions
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 |