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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 06505C73C50 for ; Tue, 9 Jul 2019 14:58:31 +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 53C1921670 for ; Tue, 9 Jul 2019 14:58:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 53C1921670 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 lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 45jlnH5R8SzDqVp for ; Wed, 10 Jul 2019 00:58:27 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=linux.ibm.com (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=nathanl@linux.ibm.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.ibm.com 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 45jllJ0nvLzDqL5 for ; Wed, 10 Jul 2019 00:56:42 +1000 (AEST) Received: from pps.filterd (m0098404.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x69EpvWw018740 for ; Tue, 9 Jul 2019 10:56:39 -0400 Received: from e13.ny.us.ibm.com (e13.ny.us.ibm.com [129.33.205.203]) by mx0a-001b2d01.pphosted.com with ESMTP id 2tmt6qrq42-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 09 Jul 2019 10:56:39 -0400 Received: from localhost by e13.ny.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) Tue, 9 Jul 2019 15:56:35 +0100 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x69EuYDc45351318 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 9 Jul 2019 14:56:35 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E1C53B2067; Tue, 9 Jul 2019 14:56:34 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BC825B205F; Tue, 9 Jul 2019 14:56:34 +0000 (GMT) Received: from localhost (unknown [9.80.239.26]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 9 Jul 2019 14:56:34 +0000 (GMT) From: Nathan Lynch To: Michael Ellerman Subject: Re: ["RFC PATCH" 1/2] powerpc/mm: Fix node look up with numa=off boot In-Reply-To: <877e8x3mb4.fsf@concordia.ellerman.id.au> References: <20190629083629.29037-1-aneesh.kumar@linux.ibm.com> <1329fd62-c2ad-f2c9-d3df-731f543dd3ea@linux.ibm.com> <87imslso3u.fsf@linux.ibm.com> <0beef991-6e3a-9f88-3c83-f9ff97c5d454@linux.ibm.com> <878stgsa2r.fsf@linux.ibm.com> <877e8x3mb4.fsf@concordia.ellerman.id.au> Date: Tue, 09 Jul 2019 09:56:34 -0500 MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 x-cbid: 19070914-0064-0000-0000-000003F8DC3D X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00011401; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000286; SDB=6.01229728; UDB=6.00647663; IPR=6.01010987; MB=3.00027652; MTD=3.00000008; XFM=3.00000015; UTC=2019-07-09 14:56:37 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19070914-0065-0000-0000-00003E31CAC5 Message-Id: <875zobs1ct.fsf@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-07-09_06:, , 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=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907090178 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Vaibhav Jain , paulus@samba.org, linuxppc-dev@lists.ozlabs.org, npiggin@gmail.com, "Aneesh Kumar K.V" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Michael Ellerman writes: > Nathan Lynch writes: >> "Aneesh Kumar K.V" writes: >>>> Just checking: do people still need numa=off? Seems like it's a >>>> maintenance burden :-) >>>> >>> >>> That is used in kdump kernel. >> >> I see, thanks. > > That doesn't mean it's a good idea :) > > Does it actually reduce memory usage much? Last time I dug into the > kdump kernel's usage of weird command line flags none of them really did > anything useful. I think it's intended to work around bugs in numa initialization, e.g. https://www.suse.com/support/kb/doc/?id=7023399 Hopefully the original bug with numa/kdump interaction has been fixed?