From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=frIq=X3=lists.ozlabs.org=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@kernel.org>
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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 42DACC10F14
	for <linuxppc-dev@archiver.kernel.org>; Wed,  2 Oct 2019 18:01:20 +0000 (UTC)
Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by mail.kernel.org (Postfix) with ESMTPS id DB9E421848
	for <linuxppc-dev@archiver.kernel.org>; Wed,  2 Oct 2019 18:01:19 +0000 (UTC)
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DB9E421848
Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com
Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])
	by lists.ozlabs.org (Postfix) with ESMTP id 46k3q00ksdzDqWd
	for <linuxppc-dev@archiver.kernel.org>; Thu,  3 Oct 2019 04:01:16 +1000 (AEST)
Authentication-Results: lists.ozlabs.org;
 spf=pass (mailfrom) smtp.mailfrom=linux.ibm.com
 (client-ip=148.163.158.5; helo=mx0a-001b2d01.pphosted.com;
 envelope-from=nathanl@linux.ibm.com; receiver=<UNKNOWN>)
Authentication-Results: lists.ozlabs.org;
 dmarc=none (p=none dis=none) header.from=linux.ibm.com
Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com
 [148.163.158.5])
 (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 46k3jv4xddzDqVl
 for <linuxppc-dev@lists.ozlabs.org>; Thu,  3 Oct 2019 03:56:51 +1000 (AEST)
Received: from pps.filterd (m0098413.ppops.net [127.0.0.1])
 by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id
 x92HqWU3115581; Wed, 2 Oct 2019 13:56:46 -0400
Received: from pps.reinject (localhost [127.0.0.1])
 by mx0b-001b2d01.pphosted.com with ESMTP id 2vd045s3g4-1
 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT);
 Wed, 02 Oct 2019 13:56:45 -0400
Received: from m0098413.ppops.net (m0098413.ppops.net [127.0.0.1])
 by pps.reinject (8.16.0.27/8.16.0.27) with SMTP id x92Hqa8G115985;
 Wed, 2 Oct 2019 13:56:45 -0400
Received: from ppma01dal.us.ibm.com (83.d6.3fa9.ip4.static.sl-reverse.com
 [169.63.214.131])
 by mx0b-001b2d01.pphosted.com with ESMTP id 2vd045s3fs-1
 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT);
 Wed, 02 Oct 2019 13:56:45 -0400
Received: from pps.filterd (ppma01dal.us.ibm.com [127.0.0.1])
 by ppma01dal.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id x92HqoIE006319;
 Wed, 2 Oct 2019 17:56:44 GMT
Received: from b01cxnp22036.gho.pok.ibm.com (b01cxnp22036.gho.pok.ibm.com
 [9.57.198.26]) by ppma01dal.us.ibm.com with ESMTP id 2v9y59q4e9-1
 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT);
 Wed, 02 Oct 2019 17:56:44 +0000
Received: from b01ledav005.gho.pok.ibm.com (b01ledav005.gho.pok.ibm.com
 [9.57.199.110])
 by b01cxnp22036.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id
 x92Huhxm39518504
 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK);
 Wed, 2 Oct 2019 17:56:44 GMT
Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1])
 by IMSVA (Postfix) with ESMTP id DFC63AE05F;
 Wed,  2 Oct 2019 17:56:43 +0000 (GMT)
Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1])
 by IMSVA (Postfix) with ESMTP id BABFCAE05C;
 Wed,  2 Oct 2019 17:56:43 +0000 (GMT)
Received: from localhost (unknown [9.85.153.250])
 by b01ledav005.gho.pok.ibm.com (Postfix) with ESMTP;
 Wed,  2 Oct 2019 17:56:43 +0000 (GMT)
From: Nathan Lynch <nathanl@linux.ibm.com>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Subject: Re: [PATCH v4 4/5] powerpc/numa: Early request for home node
 associativity
In-Reply-To: <20190913110945.12564-5-srikar@linux.vnet.ibm.com>
References: <20190913110945.12564-1-srikar@linux.vnet.ibm.com>
 <20190913110945.12564-5-srikar@linux.vnet.ibm.com>
Date: Wed, 02 Oct 2019 12:56:43 -0500
Message-ID: <87imp7jajo.fsf@linux.ibm.com>
MIME-Version: 1.0
Content-Type: text/plain
X-TM-AS-GCONF: 00
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, ,
 definitions=2019-10-02_08:, , signatures=0
X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0
 priorityscore=1501
 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0
 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0
 mlxlogscore=954 adultscore=0 classifier=spam adjust=0 reason=mlx
 scancount=1 engine=8.0.1-1908290000 definitions=main-1910020147
X-BeenThere: linuxppc-dev@lists.ozlabs.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org>
List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>
List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev/>
List-Post: <mailto:linuxppc-dev@lists.ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>
List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>
Cc: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>,
 linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
 Nicholas Piggin <npiggin@gmail.com>
Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

Srikar Dronamraju <srikar@linux.vnet.ibm.com> writes:

> Currently the kernel detects if its running on a shared lpar platform
> and requests home node associativity before the scheduler sched_domains
> are setup. However between the time NUMA setup is initialized and the
> request for home node associativity, workqueue initializes its per node
> cpumask. The per node workqueue possible cpumask may turn invalid
> after home node associativity resulting in weird situations like
> workqueue possible cpumask being a subset of workqueue online cpumask.
>
> This can be fixed by requesting home node associativity earlier just
> before NUMA setup. However at the NUMA setup time, kernel may not be in
> a position to detect if its running on a shared lpar platform. So
> request for home node associativity and if the request fails, fallback
> on the device tree property.

Reviewed-by: Nathan Lynch <nathanl@linux.ibm.com>