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Message-ID: <3486ee3b-7240-d5a7-5a3c-952133a5e9f0@huawei.com>
Date: Mon, 20 Apr 2020 11:50:37 +0100
From: John Garry <john.garry@...wei.com>
To: Joakim Zhang <qiangqing.zhang@....com>,
"peterz@...radead.org" <peterz@...radead.org>,
"mingo@...hat.com" <mingo@...hat.com>,
"acme@...nel.org" <acme@...nel.org>,
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<alexander.shishkin@...ux.intel.com>,
"jolsa@...hat.com" <jolsa@...hat.com>,
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"will@...nel.org" <will@...nel.org>
CC: "irogers@...gle.com" <irogers@...gle.com>,
"ak@...ux.intel.com" <ak@...ux.intel.com>,
Linuxarm <linuxarm@...wei.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
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<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH v2 09/13] perf vendor events: Add JSON metrics for
imx8mm DDR Perf
On 20/04/2020 05:17, Joakim Zhang wrote:
> However, it seems that there are small defects from metric.
>
> Firstly, could you help change "ScaleUnit": "9.765625e-4MB" into "ScaleUnit": "9.765625e-4KB", this is a mistake.
ok
>
> Then, you can see that test is okay from 8MM. However, metric would add twice once time from 8QM which has two ddr perf(ddr0/ddr1), it looks incorrect.
>
> 8MM:
> root@...8mmevk:~# ./perf stat -v -a -I 1000 -M imx8mm_ddr_write.all
> Using CPUID 0x00000000410fd030
> metric expr imx8_ddr.write_cycles * 4 * 4 for imx8mm_ddr_write.all
> found event imx8_ddr.write_cycles
> adding {imx8_ddr.write_cycles}:W
> imx8_ddr.write_cycles -> imx8_ddr0/event=0x2b/
> imx8_ddr.write_cycles: 13153 1000495125 1000495125
> # time counts unit events
> 1.000476625 13153 imx8_ddr.write_cycles # 205.5 MB imx8mm_ddr_write.all
> imx8_ddr.write_cycles: 3582 1000681375 1000681375
> 2.001167750 3582 imx8_ddr.write_cycles # 56.0 MB imx8mm_ddr_write.all
>
>
> 8QM:
> root@...8qmmek:~# ./perf stat -v -a -I 1000 -M imx8qm_ddr_read.all
Note: for this example, I don't know why you didn't use
imx8mm_ddr_write.all, as for your 8MM test, so we can compare the same.
> Using CPUID 0x00000000410fd030
> metric expr imx8_ddr.read_cycles * 4 * 4 for imx8qm_ddr_read.all
> found event imx8_ddr.read_cycles
> metric expr imx8_ddr.read_cycles * 4 * 4 for imx8qm_ddr_read.all
> found event imx8_ddr.read_cycles
> adding {imx8_ddr.read_cycles}:W,{imx8_ddr.read_cycles}:W
> imx8_ddr.read_cycles -> imx8_ddr0/event=0x2a/
> imx8_ddr.read_cycles -> imx8_ddr1/event=0x2a/
> imx8_ddr.read_cycles -> imx8_ddr0/event=0x2a/
> imx8_ddr.read_cycles -> imx8_ddr1/event=0x2a/
> imx8_ddr.read_cycles: 22748 1000378750 1000378750
> imx8_ddr.read_cycles: 24640 1000376625 1000376625
> imx8_ddr.read_cycles: 22800 1000375125 1000375125
> imx8_ddr.read_cycles: 24616 1000372625 1000372625
> # time counts unit events
> 1.000377250 47388 imx8_ddr.read_cycles # 740.4 MB imx8qm_ddr_read.all
> 1.000377250 47416 imx8_ddr.read_cycles
> imx8_ddr.read_cycles: 32672 1000454375 1000454375
> imx8_ddr.read_cycles: 37888 1000457250 1000457250
> imx8_ddr.read_cycles: 32736 1000460250 1000460250
> imx8_ddr.read_cycles: 38012 1000463000 1000463000
> 2.000812375 70560 imx8_ddr.read_cycles # 1102.5 MB imx8qm_ddr_read.all
> 2.000812375 70748 imx8_ddr.read_cycles
>
I that is just how the aliases work. But how about trying:
./perf stat -v -a -I 1000 -M imx8_ddr0/imx8qm_ddr_read.all/
for just ddr0
I know that the following worked for non-metrics for aliases on a
specific HW PMU, so I guess should also work for metrics:
./perf stat -e smmuv3_pmcg_200148020/smmuv3_pmcg.l1_tlb/
Thanks,
John
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