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Wed, 18 Jun 2025 08:23:07 -0700 (PDT) Message-ID: <7f4be5d6-7547-4e53-b35e-075763f10f67@linux.intel.com> Date: Wed, 18 Jun 2025 11:24:48 -0400 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 06/12] perf: Support extension of sample_regs To: Dave Hansen , Peter Zijlstra Cc: Mark Rutland , "Mi, Dapeng" , mingo@redhat.com, acme@kernel.org, namhyung@kernel.org, tglx@linutronix.de, dave.hansen@linux.intel.com, irogers@google.com, adrian.hunter@intel.com, jolsa@kernel.org, alexander.shishkin@linux.intel.com, linux-kernel@vger.kernel.org, ak@linux.intel.com, zide.chen@intel.com, broonie@kernel.org References: <20250617102813.GS1613376@noisy.programming.kicks-ass.net> <20250617133333.GU1613376@noisy.programming.kicks-ass.net> <20250617140617.GC1613633@noisy.programming.kicks-ass.net> <20250617144416.GY1613376@noisy.programming.kicks-ass.net> <20250618093500.GH1613376@noisy.programming.kicks-ass.net> <0782de41-c8c4-4077-8498-651fb9a10ef5@linux.intel.com> <20250618133003.GC1613200@noisy.programming.kicks-ass.net> <99087e26-192f-4fa6-b43b-0c6a39c45b38@linux.intel.com> <1ff8ed73-f766-494a-ab22-81c2076d7f07@intel.com> <64f071a5-3454-4dd2-9228-da9b394a3d07@intel.com> Content-Language: en-US From: "Liang, Kan" In-Reply-To: <64f071a5-3454-4dd2-9228-da9b394a3d07@intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 2025-06-18 10:47 a.m., Dave Hansen wrote: > 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. Right, there is no plan to export the XSAVE formats directly to the userspace. > Big ack from me on > that, fwiw. Thanks. :) Kan