linux-kernel - Re: [Patch v4 09/13] perf/x86/intel: Setup PEBS data configuration and enable legacy groups

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Message-ID: <20250621092718.GU1613376@noisy.programming.kicks-ass.net>
Date: Sat, 21 Jun 2025 11:27:18 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Dapeng Mi <dapeng1.mi@...ux.intel.com>
Cc: Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Eranian Stephane <eranian@...gle.com>, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org, Dapeng Mi <dapeng1.mi@...el.com>
Subject: Re: [Patch v4 09/13] perf/x86/intel: Setup PEBS data configuration
 and enable legacy groups

On Fri, Jun 20, 2025 at 10:39:05AM +0000, Dapeng Mi wrote:
> Different with legacy PEBS, arch-PEBS provides per-counter PEBS data
> configuration by programing MSR IA32_PMC_GPx/FXx_CFG_C MSRs.
> 
> This patch obtains PEBS data configuration from event attribute and then
> writes the PEBS data configuration to MSR IA32_PMC_GPx/FXx_CFG_C and
> enable corresponding PEBS groups.
> 
> Please notice this patach only enables XMM SIMD regs sampling for

What's a patach? :-)