From: Peter Zijlstra <peterz@infradead.org>
To: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Kan Liang <kan.liang@linux.intel.com>,
Like Xu <likexu@tencent.com>, Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
kvm@vger.kernel.org, linux-perf-users@vger.kernel.org,
linux-kernel@vger.kernel.org,
Zhenyu Wang <zhenyuw@linux.intel.com>,
Zhang Xiong <xiong.y.zhang@intel.com>,
Lv Zhiyuan <zhiyuan.lv@intel.com>,
Yang Weijiang <weijiang.yang@intel.com>,
Dapeng Mi <dapeng1.mi@intel.com>
Subject: Re: [Patch v4 07/13] perf/x86: Add constraint for guest perf metrics event
Date: Wed, 27 Sep 2023 13:33:12 +0200 [thread overview]
Message-ID: <20230927113312.GD21810@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <20230927033124.1226509-8-dapeng1.mi@linux.intel.com>
On Wed, Sep 27, 2023 at 11:31:18AM +0800, Dapeng Mi wrote:
> When guest wants to use PERF_METRICS MSR, a virtual metrics event needs
> to be created in the perf subsystem so that the guest can have exclusive
> ownership of the PERF_METRICS MSR.
Urgh, can someone please remind me how all that is supposed to work
again? The guest is just a task that wants the event. If the
host creates a CPU event, then that gets scheduled with higher priority
and the task looses out, no joy.
So you cannot guarantee the guest gets anything.
That is, I remember we've had this exact problem before, but I keep
forgetting how this all is supposed to work. I don't use this virt stuff
(and every time I try qemu arguments defeat me and I give up in
disgust).
next prev parent reply other threads:[~2023-09-27 11:33 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-27 3:31 [Patch v4 00/13] Enable fixed counter 3 and topdown perf metrics for vPMU Dapeng Mi
2023-09-27 3:31 ` [Patch v4 01/13] KVM: x86/pmu: Add Intel CPUID-hinted TopDown slots event Dapeng Mi
2023-09-27 3:31 ` [Patch v4 02/13] KVM: x86/pmu: Support PMU fixed counter 3 Dapeng Mi
2023-09-27 3:31 ` [Patch v4 03/13] perf/core: Add function perf_event_group_leader_check() Dapeng Mi
2023-09-27 3:31 ` [Patch v4 04/13] perf/core: Add function perf_event_move_group() Dapeng Mi
2023-09-27 3:31 ` [Patch v4 05/13] perf/core: Add *group_leader for perf_event_create_group_kernel_counters() Dapeng Mi
2023-09-27 3:31 ` [Patch v4 06/13] perf/x86: Fix typos and inconsistent indents in perf_event header Dapeng Mi
2023-09-27 3:31 ` [Patch v4 07/13] perf/x86: Add constraint for guest perf metrics event Dapeng Mi
2023-09-27 11:33 ` Peter Zijlstra [this message]
2023-09-27 17:27 ` Sean Christopherson
2023-09-28 9:24 ` Mi, Dapeng
2023-09-29 11:53 ` Peter Zijlstra
2023-09-29 15:20 ` Ravi Bangoria
2023-10-02 12:29 ` Peter Zijlstra
2023-10-03 6:36 ` Ravi Bangoria
2023-09-29 15:46 ` Sean Christopherson
2023-09-30 3:29 ` Jim Mattson
2023-10-01 0:31 ` Namhyung Kim
2023-10-02 11:57 ` Peter Zijlstra
2023-10-02 13:30 ` Ingo Molnar
2023-10-02 15:23 ` David Dunn
2023-10-02 19:02 ` Mingwei Zhang
2023-10-02 15:56 ` Sean Christopherson
2023-10-02 19:50 ` Liang, Kan
2023-10-02 20:52 ` Peter Zijlstra
2023-10-02 20:40 ` Peter Zijlstra
2023-10-03 0:56 ` Sean Christopherson
2023-10-03 8:16 ` Peter Zijlstra
2023-10-03 15:23 ` Sean Christopherson
2023-10-03 18:21 ` Jim Mattson
2023-10-04 11:32 ` Peter Zijlstra
2023-10-04 11:21 ` Peter Zijlstra
2023-10-04 19:51 ` Mingwei Zhang
2023-10-04 21:50 ` Sean Christopherson
2023-10-04 22:05 ` Sean Christopherson
2023-10-08 10:04 ` Like Xu
2023-10-09 17:03 ` Manali Shukla
2023-10-11 14:15 ` Peter Zijlstra
2023-10-17 10:24 ` Manali Shukla
2023-10-17 16:58 ` Mingwei Zhang
2023-10-18 0:01 ` Mingwei Zhang
2023-10-11 14:20 ` Peter Zijlstra
2023-10-13 17:02 ` Sean Christopherson
2023-10-03 17:31 ` Manali Shukla
2023-10-03 22:02 ` Mingwei Zhang
2023-10-04 20:43 ` Sean Christopherson
2023-09-27 3:31 ` [Patch v4 08/13] perf/core: Add new function perf_event_topdown_metrics() Dapeng Mi
2023-09-27 3:31 ` [Patch v4 09/13] perf/x86/intel: Handle KVM virtual metrics event in perf system Dapeng Mi
2023-09-27 3:31 ` [Patch v4 10/13] KVM: x86/pmu: Extend pmc_reprogram_counter() to create group events Dapeng Mi
2023-09-27 3:31 ` [Patch v4 11/13] KVM: x86/pmu: Support topdown perf metrics feature Dapeng Mi
2023-09-27 3:31 ` [Patch v4 12/13] KVM: x86/pmu: Handle PERF_METRICS overflow Dapeng Mi
2023-09-27 3:31 ` [Patch v4 13/13] KVM: x86/pmu: Expose Topdown in MSR_IA32_PERF_CAPABILITIES Dapeng Mi
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