From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 83EE815855E for ; Wed, 18 Jun 2025 14:47:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.9 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750258042; cv=none; b=OmxIOhCYqwKhKE3U0EgNurW0ijeCjryqlB6iqwUp9HNF+rZOcR/387TRHJoWiZdDIIwTDt7FC46BaGDZrSb+gsbbTyxP0TFB1v7+nwj05/BDoYcH0JLPgX7+NugaA4DHDVgBcMYF5Vc/Mh3Qa8r6fuXMnBbfOLWTn9yGl40S2Qo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750258042; c=relaxed/simple; bh=jQSyH1s27PNCKvNw3fd9+0n0YJobr3wSoWWLLx7fEhc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=dqU1UGPzFx2W1DjMRF4o8JNQKVvduDIIb/ykcoEMms3peWuP2gjRFepEBx6tHpu+uefGc9yBs0kPFEcney/Q28gLxudppD0Qm0TC0LZB2KSjocBDJ/Hyz7PFRpKmTjwE3YBQVGhULTvy7Pq3UneC9X+MNSCgcI4qvktXYOp0QKI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=cNtMaE5c; arc=none smtp.client-ip=192.198.163.9 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="cNtMaE5c" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1750258041; x=1781794041; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=jQSyH1s27PNCKvNw3fd9+0n0YJobr3wSoWWLLx7fEhc=; b=cNtMaE5cxfC0qzxFo9u1LxD4TL3sb390H8BaXOvOkjru5UceHdvt4DnU B291oALEWb8TJFwvoRNnTyIoRK1866X6qmY9GfJvbeZNJ/lCuPP2hARza v2Rik5RakWU7SzimRWn0rw8kTTCu638j/HhCTOsylo/pCGfR4o8VDB3sn /rv5HPTMib+ncH6ff0VtBQCC2q07n2GKcwG5STRIv+mzbCQi19rdl+Bj4 uN2fy/MvpjXNq8fnLfVT9ZLEt1lZVaAu1TD2ZTm94yF/jvQF51rhExHSj crSFz6IX2j7vz+zpyvSsqD0UGSOdBbDbYePMFnasCt+JR/AbGKu0uKr3b A==; X-CSE-ConnectionGUID: gNs5vex0SxunCi6JrApPTw== X-CSE-MsgGUID: EyemW3noQVCxR/zCQzjgLQ== X-IronPort-AV: E=McAfee;i="6800,10657,11468"; a="63151160" X-IronPort-AV: E=Sophos;i="6.16,246,1744095600"; d="scan'208";a="63151160" Received: from fmviesa009.fm.intel.com ([10.60.135.149]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Jun 2025 07:47:20 -0700 X-CSE-ConnectionGUID: pePJvfQaScOvSBU8ZILkFg== X-CSE-MsgGUID: toqNJTn1TCKfqX6eWx1JXQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,246,1744095600"; d="scan'208";a="150348235" Received: from agladkov-desk.ger.corp.intel.com (HELO [10.125.108.97]) ([10.125.108.97]) by fmviesa009-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Jun 2025 07:47:19 -0700 Message-ID: <64f071a5-3454-4dd2-9228-da9b394a3d07@intel.com> Date: Wed, 18 Jun 2025 07:47:18 -0700 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: "Liang, Kan" , 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> Content-Language: en-US From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; keydata= xsFNBE6HMP0BEADIMA3XYkQfF3dwHlj58Yjsc4E5y5G67cfbt8dvaUq2fx1lR0K9h1bOI6fC oAiUXvGAOxPDsB/P6UEOISPpLl5IuYsSwAeZGkdQ5g6m1xq7AlDJQZddhr/1DC/nMVa/2BoY 2UnKuZuSBu7lgOE193+7Uks3416N2hTkyKUSNkduyoZ9F5twiBhxPJwPtn/wnch6n5RsoXsb ygOEDxLEsSk/7eyFycjE+btUtAWZtx+HseyaGfqkZK0Z9bT1lsaHecmB203xShwCPT49Blxz VOab8668QpaEOdLGhtvrVYVK7x4skyT3nGWcgDCl5/Vp3TWA4K+IofwvXzX2ON/Mj7aQwf5W iC+3nWC7q0uxKwwsddJ0Nu+dpA/UORQWa1NiAftEoSpk5+nUUi0WE+5DRm0H+TXKBWMGNCFn c6+EKg5zQaa8KqymHcOrSXNPmzJuXvDQ8uj2J8XuzCZfK4uy1+YdIr0yyEMI7mdh4KX50LO1 pmowEqDh7dLShTOif/7UtQYrzYq9cPnjU2ZW4qd5Qz2joSGTG9eCXLz5PRe5SqHxv6ljk8mb ApNuY7bOXO/A7T2j5RwXIlcmssqIjBcxsRRoIbpCwWWGjkYjzYCjgsNFL6rt4OL11OUF37wL QcTl7fbCGv53KfKPdYD5hcbguLKi/aCccJK18ZwNjFhqr4MliQARAQABzUVEYXZpZCBDaHJp c3RvcGhlciBIYW5zZW4gKEludGVsIFdvcmsgQWRkcmVzcykgPGRhdmUuaGFuc2VuQGludGVs LmNvbT7CwXgEEwECACIFAlQ+9J0CGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEGg1 lTBwyZKwLZUP/0dnbhDc229u2u6WtK1s1cSd9WsflGXGagkR6liJ4um3XCfYWDHvIdkHYC1t MNcVHFBwmQkawxsYvgO8kXT3SaFZe4ISfB4K4CL2qp4JO+nJdlFUbZI7cz/Td9z8nHjMcWYF IQuTsWOLs/LBMTs+ANumibtw6UkiGVD3dfHJAOPNApjVr+M0P/lVmTeP8w0uVcd2syiaU5jB aht9CYATn+ytFGWZnBEEQFnqcibIaOrmoBLu2b3fKJEd8Jp7NHDSIdrvrMjYynmc6sZKUqH2 I1qOevaa8jUg7wlLJAWGfIqnu85kkqrVOkbNbk4TPub7VOqA6qG5GCNEIv6ZY7HLYd/vAkVY E8Plzq/NwLAuOWxvGrOl7OPuwVeR4hBDfcrNb990MFPpjGgACzAZyjdmYoMu8j3/MAEW4P0z F5+EYJAOZ+z212y1pchNNauehORXgjrNKsZwxwKpPY9qb84E3O9KYpwfATsqOoQ6tTgr+1BR CCwP712H+E9U5HJ0iibN/CDZFVPL1bRerHziuwuQuvE0qWg0+0SChFe9oq0KAwEkVs6ZDMB2 P16MieEEQ6StQRlvy2YBv80L1TMl3T90Bo1UUn6ARXEpcbFE0/aORH/jEXcRteb+vuik5UGY 5TsyLYdPur3TXm7XDBdmmyQVJjnJKYK9AQxj95KlXLVO38lczsFNBFRjzmoBEACyAxbvUEhd GDGNg0JhDdezyTdN8C9BFsdxyTLnSH31NRiyp1QtuxvcqGZjb2trDVuCbIzRrgMZLVgo3upr MIOx1CXEgmn23Zhh0EpdVHM8IKx9Z7V0r+rrpRWFE8/wQZngKYVi49PGoZj50ZEifEJ5qn/H Nsp2+Y+bTUjDdgWMATg9DiFMyv8fvoqgNsNyrrZTnSgoLzdxr89FGHZCoSoAK8gfgFHuO54B lI8QOfPDG9WDPJ66HCodjTlBEr/Cwq6GruxS5i2Y33YVqxvFvDa1tUtl+iJ2SWKS9kCai2DR 3BwVONJEYSDQaven/EHMlY1q8Vln3lGPsS11vSUK3QcNJjmrgYxH5KsVsf6PNRj9mp8Z1kIG qjRx08+nnyStWC0gZH6NrYyS9rpqH3j+hA2WcI7De51L4Rv9pFwzp161mvtc6eC/GxaiUGuH BNAVP0PY0fqvIC68p3rLIAW3f97uv4ce2RSQ7LbsPsimOeCo/5vgS6YQsj83E+AipPr09Caj 0hloj+hFoqiticNpmsxdWKoOsV0PftcQvBCCYuhKbZV9s5hjt9qn8CE86A5g5KqDf83Fxqm/ vXKgHNFHE5zgXGZnrmaf6resQzbvJHO0Fb0CcIohzrpPaL3YepcLDoCCgElGMGQjdCcSQ+Ci FCRl0Bvyj1YZUql+ZkptgGjikQARAQABwsFfBBgBAgAJBQJUY85qAhsMAAoJEGg1lTBwyZKw l4IQAIKHs/9po4spZDFyfDjunimEhVHqlUt7ggR1Hsl/tkvTSze8pI1P6dGp2XW6AnH1iayn yRcoyT0ZJ+Zmm4xAH1zqKjWplzqdb/dO28qk0bPso8+1oPO8oDhLm1+tY+cOvufXkBTm+whm +AyNTjaCRt6aSMnA/QHVGSJ8grrTJCoACVNhnXg/R0g90g8iV8Q+IBZyDkG0tBThaDdw1B2l asInUTeb9EiVfL/Zjdg5VWiF9LL7iS+9hTeVdR09vThQ/DhVbCNxVk+DtyBHsjOKifrVsYep WpRGBIAu3bK8eXtyvrw1igWTNs2wazJ71+0z2jMzbclKAyRHKU9JdN6Hkkgr2nPb561yjcB8 sIq1pFXKyO+nKy6SZYxOvHxCcjk2fkw6UmPU6/j/nQlj2lfOAgNVKuDLothIxzi8pndB8Jju KktE5HJqUUMXePkAYIxEQ0mMc8Po7tuXdejgPMwgP7x65xtfEqI0RuzbUioFltsp1jUaRwQZ MTsCeQDdjpgHsj+P2ZDeEKCbma4m6Ez/YWs4+zDm1X8uZDkZcfQlD9NldbKDJEXLIjYWo1PH hYepSffIWPyvBMBTW2W5FRjJ4vLRrJSUoEfJuPQ3vW9Y73foyo/qFoURHO48AinGPZ7PC7TF vUaNOTjKedrqHkaOcqB185ahG2had0xnFsDPlx5y In-Reply-To: <1ff8ed73-f766-494a-ab22-81c2076d7f07@intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit 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.