From patchwork Tue Aug 16 05:16:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Rui X-Patchwork-Id: 12944432 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9CECC32772 for ; Tue, 16 Aug 2022 07:57:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229627AbiHPH5b (ORCPT ); Tue, 16 Aug 2022 03:57:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60904 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230383AbiHPH4w (ORCPT ); Tue, 16 Aug 2022 03:56:52 -0400 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 427ACF47E4; Mon, 15 Aug 2022 22:13:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1660626790; x=1692162790; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=u+ZvcOj9M2zkdP1mQyjcoYw0fYKI0r1gp+/88xhN1yA=; b=Srm1zOzumwswv84gJwzNYsGXTvNptIFlqkj+tpZjD2fbTALrwfk6/HVj iUWEIMZXDesgcj//0wG2Fq1HDWzE6CeuitPyMtWSHMsZZycBrz5rM09ay u/iG/J7CFHV0Rj6t4WrZLdlxS0mXXQOSkZWX4N75dwVxFRAeNlGpqr9gS tBjGjaoTUZ5LIFsbO3zT/3vAupUl8FCtJHdl2xtKXqK71c6y3it3/u8F/ l/rqZivoIJVM6ede+PdvNQMVZro7xz3DxFW2RZm2llOB9WKuU2nqNUfHu hL9XiKtKLNYreLDbgfIARFD9gbvZ4cKb9cP4626mx3LZfUpTKpxxPSX0u g==; X-IronPort-AV: E=McAfee;i="6400,9594,10440"; a="356130180" X-IronPort-AV: E=Sophos;i="5.93,240,1654585200"; d="scan'208";a="356130180" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Aug 2022 22:13:10 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.93,240,1654585200"; d="scan'208";a="666953525" Received: from power-sh.sh.intel.com ([10.239.183.122]) by fmsmga008.fm.intel.com with ESMTP; 15 Aug 2022 22:13:07 -0700 From: Zhang Rui To: linux-kernel@vger.kernel.org, x86@kernel.org, linux-hwmon@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, corbet@lwn.net, fenghua.yu@intel.com, jdelvare@suse.com, linux@roeck-us.net, len.brown@intel.com, rui.zhang@intel.com Subject: [PATCH V2 7/8] Documentation: x86: Update smp_num_siblings/x86_max_cores description Date: Tue, 16 Aug 2022 13:16:32 +0800 Message-Id: <20220816051633.17775-8-rui.zhang@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220816051633.17775-1-rui.zhang@intel.com> References: <20220816051633.17775-1-rui.zhang@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org smp_num_siblings/cpuinfo_x86.x86_max_cores are retrieved via CPUID EAX bit_shift value, and they represent the maximum possible number of threads in a core, and the maximum possible number of cores in a package. Update the smp_num_siblings/cpuinfo_x86.x86_max_cores description in the documentation. Reviewed-by: Len Brown Signed-off-by: Zhang Rui --- Documentation/x86/topology.rst | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/Documentation/x86/topology.rst b/Documentation/x86/topology.rst index 7f58010ea86a..c5eb5bc42380 100644 --- a/Documentation/x86/topology.rst +++ b/Documentation/x86/topology.rst @@ -49,7 +49,8 @@ AMD nomenclature for package is 'Node'. - cpuinfo_x86.x86_max_cores: - The number of cores in a package. This information is retrieved via CPUID. + The maximum possible number of cores in a package. This information is + retrieved via CPUID. - cpuinfo_x86.x86_max_dies: @@ -102,10 +103,10 @@ AMDs nomenclature for a CMT core is "Compute Unit". The kernel always uses - smp_num_siblings: - The number of threads in a core. The number of threads in a package can be - calculated by:: + The maximum possible number of threads in a core. The maximum possible + number of threads in a package can be calculated by:: - threads_per_package = cpuinfo_x86.x86_max_cores * smp_num_siblings + maximum_threads_per_package = cpuinfo_x86.x86_max_cores * smp_num_siblings Threads