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Date:   Thu, 5 Mar 2020 14:48:52 -0800
From:   Andi Kleen <ak@linux.intel.com>
To:     Luwei Kang <luwei.kang@intel.com>
Cc:     x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        peterz@infradead.org, mingo@redhat.com, acme@kernel.org,
        mark.rutland@arm.com, alexander.shishkin@linux.intel.com,
        jolsa@redhat.com, namhyung@kernel.org, tglx@linutronix.de,
        bp@alien8.de, hpa@zytor.com, pbonzini@redhat.com,
        sean.j.christopherson@intel.com, vkuznets@redhat.com,
        wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org,
        pawan.kumar.gupta@linux.intel.com, thomas.lendacky@amd.com,
        fenghua.yu@intel.com, kan.liang@linux.intel.com,
        like.xu@linux.intel.com
Subject: Re: [PATCH v1 00/11] PEBS virtualization enabling via DS
Message-ID: <20200305224852.GE1454533@tassilo.jf.intel.com>
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> 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