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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id f62si29147800plb.339.2019.04.28.01.14.01 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 28 Apr 2019 01:14:01 -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=eDzzAt6J; 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=H7pSF8CSi3Mqest59wbgaWW0VcSYcjBW94HJQdX6LtQ=; b=eDzzAt6Jd4hljvq3l+ATNeBe+ qpl0rfWEg5FVpeoaZDWvRC/hp+cIzXIHkW/+gK4+ZTECZUpwoOdHVdWoVy61+cZPde0uTLt5MD26Q 4+WAFs1pMnH2K2L93uAhBHF2T3CTL8KPCewNrSaE+G7PhP8SGWuK9rD7thPYwFKZRECdivq1SLlb/ 9UCtNCQex5pXRPwOJZ5Me6Kksb1HFeZfMgirxHYgH/kJfiHy821EK+CeZq0NLkipSnCsLWfPZ91jx tVLB2jnoZHjXPknEjE0AMLDfomVTv/9r6DBGjOawGM1NpR2q7lQA2O1IAGaN6oQEoFRpZPLdIzPNe 0dzcD+bsw==; Received: from hch by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1hKewb-00016d-NE; Sun, 28 Apr 2019 08:13:53 +0000 Date: Sun, 28 Apr 2019 01:13:53 -0700 From: Christoph Hellwig To: Meelis Roos Cc: Christopher Lameter , 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, Tony Luck , Fenghua Yu , linux-ia64@vger.kernel.org Subject: Re: DISCONTIGMEM is deprecated Message-ID: <20190428081353.GB30901@infradead.org> References: <20190419094335.GJ18914@techsingularity.net> <20190419140521.GI7751@bombadil.infradead.org> <0100016a461809ed-be5bd8fc-9925-424d-9624-4a325a7a8860-000000@email.amazonses.com> <25cabb7c-9602-2e09-2fe0-cad3e54595fa@linux.ee> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <25cabb7c-9602-2e09-2fe0-cad3e54595fa@linux.ee> 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 Tue, Apr 23, 2019 at 07:49:57PM +0300, Meelis Roos wrote: > > > ia64 (looks complicated ...) > > > > Well as far as I can tell it was not even used 12 or so years ago on > > Itanium when I worked on that stuff. > > My notes tell that on UP ia64 (RX2620), !NUMA was broken with both > SPARSEMEM and DISCONTIGMEM. NUMA+SPARSEMEM or !NUMA worked. Even > NUMA+DISCONTIGMEM worked, that was my config on 2-CPU RX2660. ia64 has a such a huge number of memory model choices. Maybe we need to cut it down to a small set that actually work. That includes fund bits like the 'VIRTUAL_MEM_MAP' option where the comment claims: # VIRTUAL_MEM_MAP and FLAT_NODE_MEM_MAP are functionally equivalent. # VIRTUAL_MEM_MAP has been retained for historical reasons. but it still is selected as the default if sparsemem is not enabled..