From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sonic304-23.consmr.mail.ir2.yahoo.com (sonic304-23.consmr.mail.ir2.yahoo.com [77.238.179.148]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C1EE731B10B for ; Sun, 10 May 2026 19:45:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=77.238.179.148 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778442303; cv=none; b=GMKAwpzAmt5vae9+2yCC5ODWJUpK6t2QY9Vucmi3xbyhqbA1zfsDmCL91uEK4BjB1JH4LixXvb8hOH/6xQc+8iCj5E46oytVxFq9MZ2M+BxA7QcJz6xHB+QrwOThkxFlWC3LbT1VaCC21EATIeblyPbsZx9mwChfrIf7gI5myUw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778442303; c=relaxed/simple; bh=4XpeV4lF/a3HLV4YD1Rv9ICiEsfHbHExdHPabgjl0nM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ixJd6zwM2BgDE2waPBTBZ13E3W1BdIkh51jKEa/Ni2+4k9yjDsooLx/rbSM4cgnR2+/kdW6J5RxmHZHXqN3gPQy16CLNVAKb87xQr2ourztJjpsT43xTRks4VyKssqGURvg+aRqc5uSPLJ5WXnGdNd0JnOM6w/IY+cNBjeIKa1U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=yahoo.com; spf=pass smtp.mailfrom=yahoo.com; dkim=pass (2048-bit key) header.d=yahoo.com header.i=@yahoo.com header.b=SlTr9Vp7; arc=none smtp.client-ip=77.238.179.148 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=yahoo.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=yahoo.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=yahoo.com header.i=@yahoo.com header.b="SlTr9Vp7" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1778442300; bh=EEXchYaNLhNNKyHPk7lxnuJFOBFGN9beR+dureZixG4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject:Reply-To; b=SlTr9Vp7jm9fOlvXnD4iuGc2FLa6erFtGQlsS6H+bfHQ17GnxYlOa8dsfyC8p6YtPHmMP/itOyfRsEVrpiRZ3nqJT1Qmu9nlAIErjLp8IQYM7ZrExpr8CdzWCmZfoZWQAedxgT+vXJXK07AmTa/BUwm8nsnneaNxX/gsUc+WBN4NCabzi3FcaNDbMMkyztI4Jhx3FUTFHmlp4uDF6rRQWZUCG604YC/7gYxW/pQQd22/r2qk8AXNC/PO3Y0fc3IWrBffz5ozwkpxv7f6zrf0R4C18qvdBv0HPZszut/1YWMdh1z/vSqhaOa8jF2igaLeqQmQa3t+h4JaAGps/eHQAg== X-SONIC-DKIM-SIGN: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1778442300; bh=6r1HExe/blw7qR+iyvJOzfvMZQQCoVVm8D7/GOUrS85=; h=X-Sonic-MF:From:To:Subject:Date:From:Subject; b=tDqXJCnQJK0JTPkPsMytNiBiVXbzLPgcX8EqD/rDa1ZS+LCG+91Lczxt898vq+bizenyo/kzerQmChOwC/6O/k3Bf3p4JVjS/x2LmIXOVZiCXh1V28nEaj+3tD6q+Xbs60XEBfw/5i5NzaL2TlMQGLzBtyUYl1bMeE+LtHh/iK2gYJHV83QHyBkUewom6QzGGitZ2gUsIjadgL7i3UdTZH9yf/cQGm/mBdwWu/ILzkxyYwPQRYvQr2JnO03xvmhqTbTRNAqK8c2eYEeDn7Gro7SUZspBaE5ymLFUrPtPvJvc7Z6ge3EFN93vZ2Cg0a0h3UtyN2h3oCNzKSzsi0+AFA== X-YMail-OSG: FyYv4_wVM1ku7J63ZyubnD7NoBC8tWnae3gl0D2.juzkmrfyHKtjtBW6gnjZdR3 6tKJXFxO3txhWSwP1o4Pzmcqcp8Z1rjEU8eq8Q6m1ZVemiJdvq1U83.wZFlVOcVgVw9I9c5HSkdo GMa0Wlsm1Yu98Py2FoyoWrSncgid.9Zm6V4FKtzkIMs1x.FlLWni6FUlQ.O0KPhlVggMKngGFfsv o4DOkqNuLRVu.QWJm8KU4q4aYkFH4Afg58fyjpxpGkMgRHiI2tS0m93My2Baqm39eEKIFPWWG_kh S9DUJsgSoeytGtYyCgAaiETed_EcR6AYFJnqyIqIV9qwvZ1EzPMbFIePLtxTBY8PZnYDv7GqpbA7 O4VTlMSjHBIYh0neWz2uJt3VYIp1LoVwfcFi3XiDzu7ck94F72IhusidFOZQJxfm0sodsXEMQOoo FPNbR5gKvJ45l3hnxPTx1DLcfwjNLmS3iC1Ufv5JXegkquSPc_4AavEvTERDczCNAnmyETStjwe_ eTUNdlaW5OsErERcTA6sACm7lH1VtqAWtxM8H7g0mUEDioAozNpQA8jO8JGFiSSdpsVbVJWXXt2O BKmTflO1UImnjIdgwSOtS3LJQ0q2Vg7XuV4iho37UPzldO0jbu49xjfKHrRnFmmY7TC22PRvF.e0 es88EBla3GDrqDdD7sf346znjLVcTBGpopfJH2B1m1oa1Fg0pkuBSyeb9HM68yMJGWyNiWQ62Jbm 7vJZuZXiuYuZNN.D2lHPZGvPT1ZrbfPkaXbe8W7A8JTCDolDuy44ZlZgeprhulsXkE7p6C_3WuMB WXu1K.sDS3Sn5bK1qLIGzt3Qjco8GiLYsogSpOtlJdnzYGeGj5V_htsCJ00vavRaGOAm7q3LoD7T GbRH9iSgpoDfA4mICeIjVqi295T9FG83vP1YpolaFK7v3IacntYRGfqyw4KMfMvr3z4chgp54nmm daYU3HAWzkJM.3TbKRkfEKnXxyicpQXtSWE2yNZ6Lrzv0DeeDNZcatyWHzsL3Y1038Z6AqIXtNGg ERtYKL4f6ZW9ACsWlN71oSHaBBRluFxTMGYv6GKO4.ev6Ek5HfL5EsU0RKcLKm7erdrSsP1a07j_ E_zwFGv0oE6kJ3oXLbFWy1sZkU1xSE0M5CTlanN4OTvxg.uLl20bUyDicHeUW2McfhAyAsuT2dkV PkY.ln.PI7JzsMpjBiErtEhRBjQIXNJvL1n7B2FcTTcit4ctqgXiplXHoUeqOq6R35jyFBrgnCGW x0TFJc2PV56F7LOVgikoc5nWTI3mclPS7dz93c49HQ0AkJe3XXnsRJ7XtjJLLJqNfuDz1f3t1bag NbozMYG5T0pHHhoFzKEt8XeQ1WL_NL5KRVbZVLjYNXl_4TjlDqm1aR0eZCyLQutRxUjDj9f5s5Nx uGYgGqOgsc1wC45cTaljPMGkxLyvzrQj0LcinLqLxujB4xel5ZxVZVfNdM981btoOylFsVqhErkJ .5.5G_Sn1Eki4eswyTHY2dOV_jn4ENFnL1co7OPNn57511m3LFHqJMaSxyMSmfJ_baHNPuQ5OLJv 0K07gFrxwLT4y0oaXTVZhhwREvfCliTNM2PjnxIgIn8iNnx.q3QGwdhIPrf4E3p5FKngaqN3B_TO TLSxxUVPyDnX8msF4.8KMXNTKFlx0i0DqJNxaelyOuafaGB_7IgKzEsgO8weWl5o3SJrJA6HPUQl 2vkxpjcdAYTDuZCC7Q59eeQjm_kUEAp6D1qDnM4SkOqO3.Kh9TCRpq03S_zvJdTjbvgDQfW04x05 yD6zTTiuwcnOT53iFEY17XHUVIQqmYW6XJbeRhNdu76BFhTXep8HfukbgA7pU1c9bzFmhtdojj0J qPyCHr_uf46kAyEchrnbrfKEHe7S8ZArygAkchEnpSX0m0CoDguQE.9yHRZfhaEnfGQGLuBbsexT Cj7Id1W_MmRVAxRNa2_eYsAnwNswRYdDp5g0TSA_9q.vZq8YxUm6Bu3eL509TiAthYJwQ4CaIjxT 5VnJCahfHSwBLtxGuwlsP_Z9WG2RSRAe4ZdeIYlXoqegQiX6rab4QE3pSMe4MGju_cJBKsHdIl9f cwlWilXf.p2..0xcR7mWPVPi8BiIsrIwd7MzfcMQdCHsnx8SpcH5Dk6NTwjI5CCBON.yn9TIIG8m HdeyYVWP6rX5mPkF7YPgoT38z4jioZn3NBOt.Xgr75MPOV49UVM_V2oWCfP_2huj_k2KVFJIB61T vucCVI9tUYuBcXTOV5aGRpP0aymhlYK3Uxrx2XCRJg.vPHScepCPwoWubL57f5ug_PIo- X-Sonic-MF: X-Sonic-ID: 70ade669-a801-4f51-81e2-7672d7c61e27 Received: from sonic.gate.mail.ne1.yahoo.com by sonic304.consmr.mail.ir2.yahoo.com with HTTP; Sun, 10 May 2026 19:45:00 +0000 Received: by hermes--production-ir2-89844b765-p4qxl (Yahoo Inc. Hermes SMTP Server) with ESMTPA ID 0241877a80b841ba8e83704e7616a54a; Sun, 10 May 2026 19:34:41 +0000 (UTC) From: NicoErdmann To: linux-pm@vger.kernel.org Cc: linux-doc@vger.kernel.org, rafael@kernel.org, viresh.kumar@linaro.org, corbet@lwn.net, skhan@linuxfoundation.org, NicoErdmann Subject: [PATCH v2] cpufreq-stats: document limitations on modern cpufreq drivers Date: Sun, 10 May 2026 21:33:52 +0200 Message-ID: <20260510193352.195181-1-nicobsc4@yahoo.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add a note clarifying that cpufreq-stats may not be present or may not provide meaningful statistics depending on the active CPU frequency scaling driver. In particular, drivers such as intel_pstate and amd_pstate may use alternative mechanisms for frequency scaling and accounting. v2: - Add missing period at end of sentence (reported by Randy) Signed-off-by: NicoErdmann --- Documentation/cpu-freq/cpufreq-stats.rst | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/cpu-freq/cpufreq-stats.rst b/Documentation/cpu-freq/cpufreq-stats.rst index 9ad695b1c7db..6ffa5a6a63c9 100644 --- a/Documentation/cpu-freq/cpufreq-stats.rst +++ b/Documentation/cpu-freq/cpufreq-stats.rst @@ -28,6 +28,13 @@ Various statistics will form read_only files under this directory. This driver is designed to be independent of any particular cpufreq_driver that may be running on your CPU. So, it will work with any cpufreq_driver. +.. note:: + + On some modern systems, this interface may not be available or may not + expose meaningful statistics depending on the active CPU frequency scaling driver. + + In particular, drivers such as intel_pstate or amd_pstate may use alternative + mechanisms for frequency scaling and accounting. 2. Statistics Provided (with example) ===================================== -- 2.54.0