From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.13]) (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 4AE0B12F365; Fri, 21 Jun 2024 06:24:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.13 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718951050; cv=none; b=HjLK6LtEr+0Ik/E5VVgpCvA+z2SaivVgGHLDhZJk9yzlgbE+x6KvIz3a5IU7HAnWdvPEZ//ntFIPkniG0s5X1nogbY6XyFS8jcNTT1sDIOz0KEZCI3x66BbjcN7E/n87lEN8eHGX2x5RtrkLlk8KLjKVheblk9tLMLSGmFbYNfY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718951050; c=relaxed/simple; bh=7Cn2LiEwUik0k5WAFctKO8MFLAbRBS347iFlEJ7yo5k=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=GBoEgYol/tzDQmrlOPMhfNoZY87D/X9ZB+IOAKXmLLoqczMTNy2elZWD3cFHkHEBtID4JQVUXYCCuj2SSaTM5pSIG+JSJumlBzcG/42q6ShVjWLmNk7VbXzQixDSFXP8FGOt+ZnhThWHm5r5xC89E8xum1CokgFOA9Boa0js9oU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=ZDORCxfO; arc=none smtp.client-ip=198.175.65.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="ZDORCxfO" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1718951049; x=1750487049; h=date:from:to:cc:subject:message-id:references: mime-version:content-transfer-encoding:in-reply-to; bh=7Cn2LiEwUik0k5WAFctKO8MFLAbRBS347iFlEJ7yo5k=; b=ZDORCxfO6az9vJ4qcbjCGNdgFI7ONW38ZNsoghk60kSzp0gIUxxNifx5 2/8q55nUpus+7mvUvFTD8qHVBwc/O9mJBONEuMd98Nn+zx60tTdUxyKj3 qC/uKmIxC8LdRnbUGMqgmKMopj4O8qbJcx3nG3lA90fKGt3ljXFQhhva2 PSzhYlHiSzQr04VGASon/knSnpIch5peJ8kry0brVmdGIHrp0dinwiqRN NXkoEX+pCj4Cga560+wxL2I7idF24Y4XlM9pIZDG9kRtScDSyRcs2q1Yq byBN8NvHOCwonmFYSi/+URF6TpKJWjuH84bWXpH3Lg6WVceCzfhq1eBce A==; X-CSE-ConnectionGUID: yBd7O+YXRN6dOcFM9EKu0g== X-CSE-MsgGUID: Mu5FDXb3QvaiKukxuEd9bQ== X-IronPort-AV: E=McAfee;i="6700,10204,11109"; a="27106815" X-IronPort-AV: E=Sophos;i="6.08,253,1712646000"; d="scan'208";a="27106815" Received: from fmviesa009.fm.intel.com ([10.60.135.149]) by orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jun 2024 23:24:09 -0700 X-CSE-ConnectionGUID: CK2E6po+Sd60GzmEnY+SpQ== X-CSE-MsgGUID: ZQx7FbvFSRSuVXrXE+lpVw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,253,1712646000"; d="scan'208";a="42572422" Received: from mesincla-mobl1.amr.corp.intel.com (HELO desk) ([10.209.40.87]) by fmviesa009-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jun 2024 23:24:07 -0700 Date: Thu, 20 Jun 2024 23:23:58 -0700 From: Pawan Gupta To: Brice Goglin Cc: Dave Hansen , srinivas pandruvada , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, daniel.sneddon@linux.intel.com, tony.luck@intel.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-perf-users@vger.kernel.org, Josh Poimboeuf , "Rafael J. Wysocki" , Ricardo Neri , "Liang, Kan" , Andrew Cooper Subject: Re: [PATCH 0/9] Add CPU-type to topology Message-ID: <20240621062358.w4fjrs62uu2s5onk@desk> References: <20240617-add-cpu-type-v1-0-b88998c01e76@linux.intel.com> <8d757ea3-87a3-4663-ac76-66b04e33e6b3@gmail.com> <20240619015315.3ei5f6rovzdnxovo@desk> <0021f5f2-67c5-4b20-939d-48c9c1c60cdb@gmail.com> <1b99017a-6964-46de-ba3a-09552e7cf072@intel.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Thu, Jun 20, 2024 at 05:22:59PM +0200, Brice Goglin wrote: > Le 20/06/2024 à 17:06, Dave Hansen a écrit : > > > On 6/19/24 14:25, Brice Goglin wrote: > > > Good point. From this patch series, I understand that the current kernel > > > side doesn't care about these different E-cores. However it might be > > > good to expose them as different cpu-types (or better name) to userspace ? > > > > > > Something like type 0 = P-core, 1 = normal E-core, 2 = low power E-core ? > > The first priority here is getting the kernel to comprehend these types > > for architectural purposes: when there are functional differences > > between the cores. > > > > Let's get that in place, first. Then we can discuss the possibility of > > new ABI in the area. > > Agreed. Sorry replying late, I was on vacation. Yes, let's leave the ABI for another series when we have a clear use case.