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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Sun, 21 Apr 2019 07:39:03 +0100 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x3L6d2FV52625588 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 21 Apr 2019 06:39:02 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 35FB952052; Sun, 21 Apr 2019 06:39:02 +0000 (GMT) Received: from rapoport-lnx (unknown [9.148.8.112]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTPS id 6B7BA52050; Sun, 21 Apr 2019 06:39:01 +0000 (GMT) Date: Sun, 21 Apr 2019 09:38:59 +0300 From: Mike Rapoport To: Matthew Wilcox Cc: Mel Gorman , Andrew Morton , Mikulas Patocka , James Bottomley , linux-parisc@vger.kernel.org, linux-mm@kvack.org, Vlastimil Babka , LKML , linux-arch@vger.kernel.org Subject: Re: DISCONTIGMEM is deprecated References: <20190419094335.GJ18914@techsingularity.net> <20190419140521.GI7751@bombadil.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190419140521.GI7751@bombadil.infradead.org> User-Agent: Mutt/1.5.24 (2015-08-30) X-TM-AS-GCONF: 00 x-cbid: 19042106-0016-0000-0000-00000271078B X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19042106-0017-0000-0000-000032CD6817 Message-Id: <20190421063859.GA19926@rapoport-lnx> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-04-21_03:,, 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=460 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904210050 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Apr 19, 2019 at 07:05:21AM -0700, Matthew Wilcox wrote: > On Fri, Apr 19, 2019 at 10:43:35AM +0100, Mel Gorman wrote: > > DISCONTIG is essentially deprecated and even parisc plans to move to > > SPARSEMEM so there is no need to be fancy, this patch simply disables > > watermark boosting by default on DISCONTIGMEM. > > I don't think parisc is the only arch which uses DISCONTIGMEM for !NUMA > scenarios. Grepping the arch/ directories shows: > > alpha (does support NUMA, but also non-NUMA DISCONTIGMEM) > arc (for supporting more than 1GB of memory) > ia64 (looks complicated ...) > m68k (for multiple chunks of memory) > mips (does support NUMA but also non-NUMA) > parisc (both NUMA and non-NUMA) i386 NUMA as well > I'm not sure that these architecture maintainers even know that DISCONTIGMEM > is deprecated. Adding linux-arch to the cc. > -- Sincerely yours, Mike.