From: "Mi, Dapeng" <dapeng1.mi@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Kan Liang <kan.liang@linux.intel.com>,
Andi Kleen <ak@linux.intel.com>,
Eranian Stephane <eranian@google.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Dapeng Mi <dapeng1.mi@intel.com>
Subject: Re: [Patch v3 11/22] perf/x86/intel: Allocate arch-PEBS buffer and initialize PEBS_BASE MSR
Date: Wed, 16 Apr 2025 09:03:30 +0800 [thread overview]
Message-ID: <5a9f25a8-7679-4619-8fa1-97ab86dc6104@linux.intel.com> (raw)
In-Reply-To: <20250415134829.GB4031@noisy.programming.kicks-ass.net>
On 4/15/2025 9:48 PM, Peter Zijlstra wrote:
> On Tue, Apr 15, 2025 at 11:44:17AM +0000, Dapeng Mi wrote:
>
>> +void fini_arch_pebs_buf_on_cpu(int cpu)
>> +{
>> + if (!x86_pmu.arch_pebs)
>> + return;
>> +
>> + release_pebs_buffer(cpu);
>> + wrmsr_on_cpu(cpu, MSR_IA32_PEBS_BASE, 0, 0);
>> +}
> So first we free the pages, and then we tell the hardware to not write
> into them again.
>
> What could possibly go wrong :-)
Oh, yes. Thanks for pointing this. I would exchange the sequence.
next prev parent reply other threads:[~2025-04-16 1:03 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-15 11:44 [Patch v3 00/22] Arch-PEBS and PMU supports for Clearwater Forest and Panther Lake Dapeng Mi
2025-04-15 11:44 ` [Patch v3 01/22] perf/x86/intel: Add Panther Lake support Dapeng Mi
2025-04-15 11:44 ` [Patch v3 02/22] perf/x86/intel: Add PMU support for Clearwater Forest Dapeng Mi
2025-04-15 11:44 ` [Patch v3 03/22] perf/x86/intel: Parse CPUID archPerfmonExt leaves for non-hybrid CPUs Dapeng Mi
2025-04-15 11:44 ` [Patch v3 04/22] perf/x86/intel: Decouple BTS initialization from PEBS initialization Dapeng Mi
2025-04-15 11:44 ` [Patch v3 05/22] perf/x86/intel: Rename x86_pmu.pebs to x86_pmu.ds_pebs Dapeng Mi
2025-04-15 11:44 ` [Patch v3 06/22] perf/x86/intel: Introduce pairs of PEBS static calls Dapeng Mi
2025-04-15 11:44 ` [Patch v3 07/22] perf/x86/intel: Initialize architectural PEBS Dapeng Mi
2025-04-15 11:44 ` [Patch v3 08/22] perf/x86/intel/ds: Factor out PEBS record processing code to functions Dapeng Mi
2025-04-15 11:44 ` [Patch v3 09/22] perf/x86/intel/ds: Factor out PEBS group " Dapeng Mi
2025-04-15 11:44 ` [Patch v3 10/22] perf/x86/intel: Process arch-PEBS records or record fragments Dapeng Mi
2025-04-15 13:57 ` Peter Zijlstra
2025-04-15 16:09 ` Liang, Kan
2025-04-15 11:44 ` [Patch v3 11/22] perf/x86/intel: Allocate arch-PEBS buffer and initialize PEBS_BASE MSR Dapeng Mi
2025-04-15 13:45 ` Peter Zijlstra
2025-04-16 0:59 ` Mi, Dapeng
2025-04-15 13:48 ` Peter Zijlstra
2025-04-16 1:03 ` Mi, Dapeng [this message]
2025-04-15 11:44 ` [Patch v3 12/22] perf/x86/intel: Update dyn_constranit base on PEBS event precise level Dapeng Mi
2025-04-15 13:53 ` Peter Zijlstra
2025-04-15 16:31 ` Liang, Kan
2025-04-16 1:46 ` Mi, Dapeng
2025-04-16 13:59 ` Liang, Kan
2025-04-17 1:15 ` Mi, Dapeng
2025-04-16 15:32 ` Peter Zijlstra
2025-04-16 19:45 ` Liang, Kan
2025-04-16 19:56 ` Peter Zijlstra
2025-04-22 22:50 ` Liang, Kan
2025-04-15 11:44 ` [Patch v3 13/22] perf/x86/intel: Setup PEBS data configuration and enable legacy groups Dapeng Mi
2025-04-15 11:44 ` [Patch v3 14/22] perf/x86/intel: Add counter group support for arch-PEBS Dapeng Mi
2025-04-15 11:44 ` [Patch v3 15/22] perf/x86/intel: Support SSP register capturing " Dapeng Mi
2025-04-15 14:07 ` Peter Zijlstra
2025-04-16 5:49 ` Mi, Dapeng
2025-04-15 11:44 ` [Patch v3 16/22] perf/core: Support to capture higher width vector registers Dapeng Mi
2025-04-15 14:36 ` Peter Zijlstra
2025-04-16 6:42 ` Mi, Dapeng
2025-04-16 15:53 ` Peter Zijlstra
2025-04-17 2:00 ` Mi, Dapeng
2025-04-22 3:05 ` Mi, Dapeng
2025-04-15 11:44 ` [Patch v3 17/22] perf/x86/intel: Support arch-PEBS vector registers group capturing Dapeng Mi
2025-04-15 11:44 ` [Patch v3 18/22] perf tools: Support to show SSP register Dapeng Mi
2025-04-15 11:44 ` [Patch v3 19/22] perf tools: Enhance arch__intr/user_reg_mask() helpers Dapeng Mi
2025-04-15 11:44 ` [Patch v3 20/22] perf tools: Enhance sample_regs_user/intr to capture more registers Dapeng Mi
2025-04-15 11:44 ` [Patch v3 21/22] perf tools: Support to capture more vector registers (x86/Intel) Dapeng Mi
2025-04-15 11:44 ` [Patch v3 22/22] perf tools/tests: Add vector registers PEBS sampling test Dapeng Mi
2025-04-15 15:21 ` [Patch v3 00/22] Arch-PEBS and PMU supports for Clearwater Forest and Panther Lake Liang, Kan
2025-04-16 7:42 ` Peter Zijlstra
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