From: "Mi, Dapeng" <dapeng1.mi@linux.intel.com>
To: Andi Kleen <ak@linux.intel.com>, 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>,
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 v2 15/24] perf/x86/intel: Add SSP register support for arch-PEBS
Date: Thu, 27 Feb 2025 14:29:36 +0800 [thread overview]
Message-ID: <92ecca66-e0ca-42d8-a54a-f3e5d016e42a@linux.intel.com> (raw)
In-Reply-To: <Z74rqf5V6bfTZxhG@tassilo>
On 2/26/2025 4:44 AM, Andi Kleen wrote:
> On Tue, Feb 25, 2025 at 12:54:50PM +0100, Peter Zijlstra wrote:
>> On Tue, Feb 18, 2025 at 03:28:09PM +0000, Dapeng Mi wrote:
>>
>>> @@ -651,6 +651,16 @@ int x86_pmu_hw_config(struct perf_event *event)
>>> return -EINVAL;
>>> }
>>>
>>> + /* sample_regs_user never support SSP register. */
>>> + if (unlikely(event->attr.sample_regs_user & BIT_ULL(PERF_REG_X86_SSP)))
>>> + return -EINVAL;
>> We can easily enough read user SSP, no?
> Not for multi record PEBS.
>
> Also technically it may not be precise.
Yes, If need to support to capture user space SSP, then PEBS has to fall
back to only capture single record.
Andi, you said "it may not be precise", could you please give more details?
I didn't get this. Thanks.
>
> -andi
>
next prev parent reply other threads:[~2025-02-27 6:29 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-18 15:27 [Patch v2 00/24] Arch-PEBS and PMU supports for Clearwater Forest and Panther Lake Dapeng Mi
2025-02-18 15:27 ` [Patch v2 01/24] perf/x86: Add dynamic constraint Dapeng Mi
2025-02-18 15:27 ` [Patch v2 02/24] perf/x86/intel: Add Panther Lake support Dapeng Mi
2025-02-18 15:27 ` [Patch v2 03/24] perf/x86/intel: Add PMU support for Clearwater Forest Dapeng Mi
2025-02-18 15:27 ` [Patch v2 04/24] perf/x86/intel: Parse CPUID archPerfmonExt leaves for non-hybrid CPUs Dapeng Mi
2025-02-18 15:27 ` [Patch v2 05/24] perf/x86/intel: Decouple BTS initialization from PEBS initialization Dapeng Mi
2025-02-18 15:28 ` [Patch v2 06/24] perf/x86/intel: Rename x86_pmu.pebs to x86_pmu.ds_pebs Dapeng Mi
2025-02-18 15:28 ` [Patch v2 07/24] perf/x86/intel: Introduce pairs of PEBS static calls Dapeng Mi
2025-02-18 15:28 ` [Patch v2 08/24] perf/x86/intel: Initialize architectural PEBS Dapeng Mi
2025-02-18 15:28 ` [Patch v2 09/24] perf/x86/intel/ds: Factor out common PEBS processing code to functions Dapeng Mi
2025-02-18 15:28 ` [Patch v2 10/24] perf/x86/intel: Process arch-PEBS records or record fragments Dapeng Mi
2025-02-25 10:39 ` Peter Zijlstra
2025-02-25 11:00 ` Peter Zijlstra
2025-02-26 5:20 ` Mi, Dapeng
2025-02-26 9:35 ` Peter Zijlstra
2025-02-26 15:45 ` Liang, Kan
2025-02-27 2:04 ` Mi, Dapeng
2025-02-25 20:42 ` Andi Kleen
2025-02-26 2:54 ` Mi, Dapeng
2025-02-18 15:28 ` [Patch v2 11/24] perf/x86/intel: Factor out common functions to process PEBS groups Dapeng Mi
2025-02-25 11:02 ` Peter Zijlstra
2025-02-26 5:24 ` Mi, Dapeng
2025-02-18 15:28 ` [Patch v2 12/24] perf/x86/intel: Allocate arch-PEBS buffer and initialize PEBS_BASE MSR Dapeng Mi
2025-02-25 11:18 ` Peter Zijlstra
2025-02-26 5:48 ` Mi, Dapeng
2025-02-26 9:46 ` Peter Zijlstra
2025-02-27 2:05 ` Mi, Dapeng
2025-02-25 11:25 ` Peter Zijlstra
2025-02-26 6:19 ` Mi, Dapeng
2025-02-26 9:48 ` Peter Zijlstra
2025-02-27 2:09 ` Mi, Dapeng
2025-02-18 15:28 ` [Patch v2 13/24] perf/x86/intel: Update dyn_constranit base on PEBS event precise level Dapeng Mi
2025-02-27 14:06 ` Liang, Kan
2025-03-05 1:41 ` Mi, Dapeng
2025-02-18 15:28 ` [Patch v2 14/24] perf/x86/intel: Setup PEBS data configuration and enable legacy groups Dapeng Mi
2025-02-18 15:28 ` [Patch v2 15/24] perf/x86/intel: Add SSP register support for arch-PEBS Dapeng Mi
2025-02-25 11:52 ` Peter Zijlstra
2025-02-26 6:56 ` Mi, Dapeng
2025-02-25 11:54 ` Peter Zijlstra
2025-02-25 20:44 ` Andi Kleen
2025-02-27 6:29 ` Mi, Dapeng [this message]
2025-02-18 15:28 ` [Patch v2 16/24] perf/x86/intel: Add counter group " Dapeng Mi
2025-02-18 15:28 ` [Patch v2 17/24] perf/core: Support to capture higher width vector registers Dapeng Mi
2025-02-25 20:32 ` Peter Zijlstra
2025-02-26 7:55 ` Mi, Dapeng
2025-02-18 15:28 ` [Patch v2 18/24] perf/x86/intel: Support arch-PEBS vector registers group capturing Dapeng Mi
2025-02-25 15:32 ` Peter Zijlstra
2025-02-26 8:08 ` Mi, Dapeng
2025-02-27 6:40 ` Mi, Dapeng
2025-03-04 3:08 ` Mi, Dapeng
2025-03-04 16:26 ` Liang, Kan
2025-03-05 1:34 ` Mi, Dapeng
2025-02-18 15:28 ` [Patch v2 19/24] perf tools: Support to show SSP register Dapeng Mi
2025-02-18 15:28 ` [Patch v2 20/24] perf tools: Enhance arch__intr/user_reg_mask() helpers Dapeng Mi
2025-02-18 15:28 ` [Patch v2 21/24] perf tools: Enhance sample_regs_user/intr to capture more registers Dapeng Mi
2025-02-18 15:28 ` [Patch v2 22/24] perf tools: Support to capture more vector registers (x86/Intel) Dapeng Mi
2025-02-18 15:28 ` [Patch v2 23/24] perf tools/tests: Add vector registers PEBS sampling test Dapeng Mi
2025-02-18 15:28 ` [Patch v2 24/24] perf tools: Fix incorrect --user-regs comments Dapeng Mi
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