linux-kernel - Re: [RFC PATCH 06/12] perf: Support extension of sample

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Message-ID: <64f071a5-3454-4dd2-9228-da9b394a3d07@intel.com>
Date: Wed, 18 Jun 2025 07:47:18 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: "Liang, Kan" <kan.liang@...ux.intel.com>,
 Peter Zijlstra <peterz@...radead.org>
Cc: Mark Rutland <mark.rutland@....com>,
 "Mi, Dapeng" <dapeng1.mi@...ux.intel.com>, mingo@...hat.com,
 acme@...nel.org, namhyung@...nel.org, tglx@...utronix.de,
 dave.hansen@...ux.intel.com, irogers@...gle.com, adrian.hunter@...el.com,
 jolsa@...nel.org, alexander.shishkin@...ux.intel.com,
 linux-kernel@...r.kernel.org, ak@...ux.intel.com, zide.chen@...el.com,
 broonie@...nel.org
Subject: Re: [RFC PATCH 06/12] perf: Support extension of sample_regs

On 6/18/25 07:30, Dave Hansen wrote:
> If software is going to munge the XSAVE format, then you don't have to
> worry about alignment because you'd save it to some probably per-cpu
> 64-byte-aligned buffer and then munge it into the unaligned
> PERF_SAMPLE_SIMD_REGS above.

BTW, Peter just mentioned that you're just going to munge both the XSAVE
and PEBS formats before letting userspace see them. Big ack from me on
that, fwiw.