From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AEA53C43387 for ; Mon, 24 Dec 2018 12:26:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8587221850 for ; Mon, 24 Dec 2018 12:26:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725897AbeLXM0S (ORCPT ); Mon, 24 Dec 2018 07:26:18 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:33004 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725308AbeLXM0S (ORCPT ); Mon, 24 Dec 2018 07:26:18 -0500 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id wBOCNmiF047341 for ; Mon, 24 Dec 2018 07:26:16 -0500 Received: from e34.co.us.ibm.com (e34.co.us.ibm.com [32.97.110.152]) by mx0b-001b2d01.pphosted.com with ESMTP id 2pjume8q3c-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 24 Dec 2018 07:26:16 -0500 Received: from localhost by e34.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 24 Dec 2018 12:26:10 -0000 Received: from b03ledav001.gho.boulder.ibm.com (b03ledav001.gho.boulder.ibm.com [9.17.130.232]) by b03cxnp08026.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id wBOCQ9qS20709612 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 24 Dec 2018 12:26:09 GMT Received: from b03ledav001.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 10D016E053; Mon, 24 Dec 2018 12:26:09 +0000 (GMT) Received: from b03ledav001.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 45E596E04E; Mon, 24 Dec 2018 12:25:41 +0000 (GMT) Received: from [9.85.137.124] (unknown [9.85.137.124]) by b03ledav001.gho.boulder.ibm.com (Postfix) with ESMTP; Mon, 24 Dec 2018 12:25:40 +0000 (GMT) Subject: Re: [PATCH v4 10/10] sched/fair: Provide idle search schedstats To: Steve Sistare , mingo@redhat.com, peterz@infradead.org Cc: subhra.mazumdar@oracle.com, dhaval.giani@oracle.com, daniel.m.jordan@oracle.com, pavel.tatashin@microsoft.com, matt@codeblueprint.co.uk, umgwanakikbuti@gmail.com, riel@redhat.com, jbacik@fb.com, juri.lelli@redhat.com, valentin.schneider@arm.com, vincent.guittot@linaro.org, quentin.perret@arm.com, linux-kernel@vger.kernel.org References: <1544131696-2888-1-git-send-email-steven.sistare@oracle.com> <1544131696-2888-11-git-send-email-steven.sistare@oracle.com> From: Rick Lindsley Date: Mon, 24 Dec 2018 04:25:37 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1544131696-2888-11-git-send-email-steven.sistare@oracle.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 18122412-0016-0000-0000-000009689B5D X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010278; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000272; SDB=6.01136370; UDB=6.00590994; IPR=6.00916550; MB=3.00024820; MTD=3.00000008; XFM=3.00000015; UTC=2018-12-24 12:26:14 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18122412-0017-0000-0000-000041844C83 Message-Id: <6966a01e-8144-f268-ac9b-3e6fad3a5b2d@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-12-24_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=616 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1812240110 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/06/2018 01:28 PM, Steve Sistare wrote: > Add schedstats to measure the effectiveness of searching for idle CPUs > and stealing tasks. This is a temporary patch intended for use during > development only. SCHEDSTAT_VERSION is bumped to 16, and the following > fields are added to the per-CPU statistics of /proc/schedstat: Why only temporary? It would seem that this might be useful information in the future too, for other developers with either new code or new use cases. Rick