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=-2.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 CC841C43387 for ; Mon, 14 Jan 2019 17:05:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9DD9220659 for ; Mon, 14 Jan 2019 17:05:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="qjHe9qzd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726854AbfANRFD (ORCPT ); Mon, 14 Jan 2019 12:05:03 -0500 Received: from userp2120.oracle.com ([156.151.31.85]:59126 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726646AbfANRFC (ORCPT ); Mon, 14 Jan 2019 12:05:02 -0500 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.22/8.16.0.22) with SMTP id x0EGrksQ047505; Mon, 14 Jan 2019 17:04:27 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=subject : to : cc : references : from : message-id : date : mime-version : in-reply-to : content-type : content-transfer-encoding; s=corp-2018-07-02; bh=7AFiiHYy7HBKm+Dazr0Agt4+SEq1G0/dENZ+3Arm9gQ=; b=qjHe9qzd1FfaQNDamwF5UBGPJppNtog/e/3cKn2kM6lv+CtkAtGIxoc7RYjjNFVsvz1Y S3j8suPhEGJuhw9t9H3KJoWkNMuLMkirVg7e76mzInPA93KmT/M4QMa+VKyz/uLZYdWy gAyRFMy7IahU86qt5Q0pP3szm8rWc6P6YPnTCZX9a8zw6SpHhnjL7PCsJiS/Uh16Hg0N 5uxb9BIjzIFlhN+GX7Zau1576tW097yMDaGyuEAbPWw9ZUt41nAxAjoYucVqh+sXb9Yi 5np3DOAL/47Tg38czK4UZzj5toypLcdBRWp/DIQDgyV8Tm6mWiF2anZY8X2x8a5J1UXx HQ== Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by userp2120.oracle.com with ESMTP id 2pybjrxqrj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 14 Jan 2019 17:04:27 +0000 Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserv0022.oracle.com (8.14.4/8.14.4) with ESMTP id x0EH4Ptm002298 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 14 Jan 2019 17:04:26 GMT Received: from abhmp0004.oracle.com (abhmp0004.oracle.com [141.146.116.10]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x0EH4NGA016660; Mon, 14 Jan 2019 17:04:24 GMT Received: from [10.152.35.100] (/10.152.35.100) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 14 Jan 2019 09:04:22 -0800 Subject: Re: [PATCH v4 10/10] sched/fair: Provide idle search schedstats To: Rick Lindsley , 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> <6966a01e-8144-f268-ac9b-3e6fad3a5b2d@linux.vnet.ibm.com> From: Steven Sistare Organization: Oracle Corporation Message-ID: <5447e3b5-db58-1ace-9974-6dfc250b4a1e@oracle.com> Date: Mon, 14 Jan 2019 12:04:19 -0500 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <6966a01e-8144-f268-ac9b-3e6fad3a5b2d@linux.vnet.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9136 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=635 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1901140139 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/24/2018 7:25 AM, Rick Lindsley wrote: > 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 Yes, they could be useful. I suspect it would take a while to reach consensus on new field definition, and whether their usefulness outweighs the downside of breaking out of tree tools that assume version 15. - Steve