From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 40mJ8S6Vy3zF155 for ; Thu, 17 May 2018 01:22:32 +1000 (AEST) Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w4GFFBD5005858 for ; Wed, 16 May 2018 11:22:30 -0400 Received: from e33.co.us.ibm.com (e33.co.us.ibm.com [32.97.110.151]) by mx0a-001b2d01.pphosted.com with ESMTP id 2j0pwh15pt-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 16 May 2018 11:22:29 -0400 Received: from localhost by e33.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 16 May 2018 09:22:29 -0600 From: Stewart Smith To: Akshay Adiga , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: Akshay Adiga , npiggin@gmail.com, ego@linux.vnet.ibm.com Subject: Re: [PATCH] cpuidle/powernv : init all present cpus for deep states In-Reply-To: <1526472134-23757-1-git-send-email-akshay.adiga@linux.vnet.ibm.com> References: <1526472134-23757-1-git-send-email-akshay.adiga@linux.vnet.ibm.com> Date: Wed, 16 May 2018 10:22:22 -0500 MIME-Version: 1.0 Content-Type: text/plain Message-Id: <87efiby6a9.fsf@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Akshay Adiga writes: > Init all present cpus for deep states instead of "all possible" cpus. > Init fails if the possible cpu is gaurded. Resulting in making only > non-deep states available for cpuidle/hotplug. Should this also head to stable? It means that for single threaded workloads, if you guard out a CPU core you'll not get WoF, which means that performance goes down when you wouldn't expect it to. Right? -- Stewart Smith OPAL Architect, IBM.