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

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Date:   Thu, 22 Jul 2021 20:53:19 +0800
From:   Liuxiangdong <liuxiangdong5@...wei.com>
To:     <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>,
        <kan.liang@...ux.intel.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <liuxiangdong5@...wei.com>,
        <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

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?

Thanks,
Xiangdong Liu