linux-kernel - Re: [RFCv2 00/48] perf tools: Add threads to record command

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Date:   Mon, 24 Sep 2018 10:02:56 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFCv2 00/48] perf tools: Add threads to record command

Hi,

On 23.09.2018 22:30, Jiri Olsa wrote:
> On Fri, Sep 21, 2018 at 09:13:08AM +0300, Alexey Budankov wrote:
> 
> SNIP
> 
>> Events:
>> cpu/period=P,event=0x3c/Duk;CPU_CLK_UNHALTED.THREAD
>> cpu/period=P,umask=0x3/Duk;CPU_CLK_UNHALTED.REF_TSC
>> cpu/period=P,event=0xc0/Duk;INST_RETIRED.ANY
>> cpu/period=0xaae61,event=0xc2,umask=0x10/uk;UOPS_RETIRED.ALL
>> cpu/period=0x11171,event=0xc2,umask=0x20/uk;UOPS_RETIRED.SCALAR_SIMD
>> cpu/period=0x11171,event=0xc2,umask=0x40/uk;UOPS_RETIRED.PACKED_SIMD
>>
>> =================================================
>>
>> Command:
>> /usr/bin/time /tmp/vtune_amplifier_2019.574715/bin64/perf.thr record --threads=T \
>> 	-a -N -B -T -R --call-graph dwarf,1024 --user-regs=ip,bp,sp \
>>         -e cpu/period=P,event=0x3c/Duk,\
>>            cpu/period=P,umask=0x3/Duk,\
>>            cpu/period=P,event=0xc0/Duk,\
>>            cpu/period=0x30d40,event=0xc2,umask=0x10/uk,\
>>            cpu/period=0x4e20,event=0xc2,umask=0x20/uk,\
>>            cpu/period=0x4e20,event=0xc2,umask=0x40/uk \
>>          --clockid=monotonic_raw -- ./matrix.(icc|gcc)
> 
> hum, so I guess the results suck because of the -a option,
> getting extra samples for all the perf record threads
> 
> could you try without the -a? you monitor only user events,
> so you're interested only in ./matrix.* samples, right?

Ok, trying without -a, in per-process mode. 
VTune collects as user as kernel mode samples, using /uk modifiers set.
The set can be extended to collect in VM host and guests as well.

Thanks,
Alexey

> 
> thanks,
> jirka
>