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Subject: Re: [PATCH] perf metricgroup: Fix system PMU metrics
To:     Joakim Zhang <qiangqing.zhang@nxp.com>,
        "peterz@infradead.org" <peterz@infradead.org>,
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        <alexander.shishkin@linux.intel.com>,
        "jolsa@redhat.com" <jolsa@redhat.com>,
        "namhyung@kernel.org" <namhyung@kernel.org>,
        "irogers@google.com" <irogers@google.com>,
        "kjain@linux.ibm.com" <kjain@linux.ibm.com>
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From:   John Garry <john.garry@huawei.com>
Message-ID: <b25f0861-1cec-3ac8-a0ef-8e9e94c4e662@huawei.com>
Date:   Tue, 19 Jan 2021 15:47:00 +0000
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On 19/01/2021 10:56, Joakim Zhang wrote:
> It seems have other issue compared to 5.10 kernel after switching to this framework, below metric can't work.
> "MetricExpr": "(( imx8_ddr0@read\\-cycles@ + imx8_ddr0@write\\-cycles@ ) * 4 * 4 / duration_time) / (750 * 1000000 * 4 * 4)"
> After change to:
> "MetricExpr": "(( imx8mm_ddr.read_cycles + imx8mm_ddr.write_cycles ) * 4 * 4 / duration_time) / (750 * 1000000 * 4 * 4)",

It seems that any metric which includes "duration_time" is broken, even 
on x86:

john@localhost:~/acme/tools/perf> sudo ./perf stat -v -M 
L1D_Cache_Fill_BW sleep 1
Using CPUID GenuineIntel-6-3D-4
metric expr 64 * l1d.replacement / 1000000000 / duration_time for 
L1D_Cache_Fill_BW
found event duration_time
found event l1d.replacement
adding {l1d.replacement}:W,duration_time
l1d.replacement -> cpu/umask=0x1,(null)=0x1e8483,event=0x51/
Segmentation fault


Seems to be from my commit c2337d67199 ("perf metricgroup: Fix metrics 
using aliases covering multiple PMUs")

I'll look to fix it now.

Thanks,
John