linux-kernel - Re: [PATCH V8 00/18] KVM: x86/pmu: Add *basic* support to enable guest PEBS via DS

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Message-ID: <4e990190-069e-4769-b0be-7db7d721f8a6@linux.intel.com>
Date:   Thu, 22 Jul 2021 09:08:12 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Liuxiangdong <liuxiangdong5@...wei.com>, lingshan.zhu@...el.com,
        like.xu.linux@...il.com
Cc:     ak@...ux.intel.com, boris.ostrvsky@...cle.com, bp@...en8.de,
        eranian@...gle.com, jmattson@...gle.com, joro@...tes.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        pbonzini@...hat.com, peterz@...radead.org, seanjc@...gle.com,
        vkuznets@...hat.com, wanpengli@...cent.com, wei.w.wang@...el.com,
        x86@...nel.org, Xiexiangyou <xiexiangyou@...wei.com>,
        "Fangyi (Eric)" <eric.fangyi@...wei.com>
Subject: Re: [PATCH V8 00/18] KVM: x86/pmu: Add *basic* support to enable
 guest PEBS via DS



On 7/22/2021 8:53 AM, Liuxiangdong wrote:
> Hi，like and lingshan.
> 
> We can use pebs on the Icelake by using "perf record -e $event:pp", but 
> how can we get all the supported $event for the Icelake?
> Because it seems like that all the hardware event/software event/kernel 
> pmu event listed by "perf list" can use ":pp" without error.
> 
> 
> By quering events list for Icelake("https://perfmon-events.intel.com/), 
> we can use "perf record -e cpu/event=0xXX,unask=0xXX/pp"
> to enable sampling. There are some events with "PEBS： 
> [PreciseEventingIP]" in "Additional Info" column. Are they the only 
> supported
> precise events? Do those events which have "PEBS:[NonPreciseEventingIP]" 
> in last column support PEBS?
>

Starts from Ice Lake, the extended PEBS feature is supported, which 
extend the PEBS for all counters and all performance monitoring events 
(both precise event and non-precise). You can sample any events with PEBS.
For details, please refer to the 18.9.1 extended PEBS in the latest SDM 
vol3.

Thanks,
Kan