linux-kernel - Re: [PATCH v1 00/11] PEBS virtualization enabling via DS

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Date:   Thu, 5 Mar 2020 14:48:52 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Luwei Kang <luwei.kang@...el.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org, tglx@...utronix.de,
        bp@...en8.de, hpa@...or.com, pbonzini@...hat.com,
        sean.j.christopherson@...el.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        pawan.kumar.gupta@...ux.intel.com, thomas.lendacky@....com,
        fenghua.yu@...el.com, kan.liang@...ux.intel.com,
        like.xu@...ux.intel.com
Subject: Re: [PATCH v1 00/11] PEBS virtualization enabling via DS

> Testing:
> The guest can use PEBS feature like native. e.g.

Could you please add example qemu command lines too? That will make it much easier
for someone to reproduce.

-Andi
> 
> # perf record -e instructions:ppp ./br_instr a
> 
> perf report on guest:
> # Samples: 2K of event 'instructions:ppp', # Event count (approx.): 1473377250
> # Overhead  Command   Shared Object      Symbol
>   57.74%  br_instr  br_instr           [.] lfsr_cond
>   41.40%  br_instr  br_instr           [.] cmp_end
>    0.21%  br_instr  [kernel.kallsyms]  [k] __lock_acquire
> 
> perf report on host:
> # Samples: 2K of event 'instructions:ppp', # Event count (approx.): 1462721386
> # Overhead  Command   Shared Object     Symbol
>   57.90%  br_instr  br_instr          [.] lfsr_cond
>   41.95%  br_instr  br_instr          [.] cmp_end
>    0.05%  br_instr  [kernel.vmlinux]  [k] lock_acquire