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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id j15si29948438pfi.8.2019.04.28.01.11.17 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 28 Apr 2019 01:11:17 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of batv+6e876697d14fde6a77e3+5726+infradead.org+hch@bombadil.srs.infradead.org designates 2607:7c80:54:e::133 as permitted sender) client-ip=2607:7c80:54:e::133; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20170209 header.b=TFCG+qkP; spf=pass (google.com: best guess record for domain of batv+6e876697d14fde6a77e3+5726+infradead.org+hch@bombadil.srs.infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=BATV+6e876697d14fde6a77e3+5726+infradead.org+hch@bombadil.srs.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=9cfzCZHsC8Z1URVhGFCxQrxINgq5TQBCpge+7Hexgeo=; b=TFCG+qkPsR1tZhgIZ7nDdAu0U 41Nj91cp2ngQL//A/7D/Qd/9wiELv5/cmOFeNyPyksBVKb+qMzDrmLMV4ybT5jMS9H+MF5ZsLts1l lfKLPgcZ0ZX3lBjNfifZXvn/oylF71G4vYc2rkGFLX8tAm9OrHVcOVcOGG0fnOkbaFDAL4OM0KDPp T8SYAMoCCLFGrrD8yxjawK2PBNYA0Xix+L43FIhjbTddeH2nGIBjguRfnkqeOg3LL21Kp+PkuxAh/ 4bERD+PCrlUYLJtsUSZQ5FXKeu2DsZb8IsCRYAqtv3geoy0wDTwEDGjksVmGvGbPjksJtmYTcqLcr 1c0xSPqAg==; Received: from hch by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1hKetv-00011K-CV; Sun, 28 Apr 2019 08:11:07 +0000 Date: Sun, 28 Apr 2019 01:11:07 -0700 From: Christoph Hellwig To: Mike Rapoport Cc: Christoph Hellwig , Mel Gorman , Matthew Wilcox , 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 Message-ID: <20190428081107.GA30901@infradead.org> References: <20190419094335.GJ18914@techsingularity.net> <20190419140521.GI7751@bombadil.infradead.org> <20190421063859.GA19926@rapoport-lnx> <20190421132606.GJ7751@bombadil.infradead.org> <20190421211604.GN18914@techsingularity.net> <20190423071354.GB12114@infradead.org> <20190424113352.GA6278@rapoport-lnx> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190424113352.GA6278@rapoport-lnx> User-Agent: Mutt/1.9.2 (2017-12-15) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html 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 Wed, Apr 24, 2019 at 02:33:53PM +0300, Mike Rapoport wrote: > On Tue, Apr 23, 2019 at 12:13:54AM -0700, Christoph Hellwig wrote: > > On Sun, Apr 21, 2019 at 10:16:04PM +0100, Mel Gorman wrote: > > > 32-bit NUMA systems should be non-existent in practice. The last NUMA > > > system I'm aware of that was both NUMA and 32-bit only died somewhere > > > between 2004 and 2007. If someone is running a 64-bit capable system in > > > 32-bit mode with NUMA, they really are just punishing themselves for fun. > > > > Can we mark it as BROKEN to see if someone shouts and then remove it > > a year or two down the road? Or just kill it off now.. > > How about making SPARSEMEM default for x86-32? Sounds good. Another question: I always found the option to even select the memory models like a bad tradeoff. Can we really expect a user to make a sane choice? I'd rather stick to a relativelty optimal choice based on arch and maybe a few other parameters (NUMA or not for example) and stick to it, reducing the testing matrix.