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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id r20si10053172pgb.162.2019.04.21.06.26.12 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 21 Apr 2019 06:26:12 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of willy@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=RgDwe3K3; spf=pass (google.com: best guess record for domain of willy@infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=willy@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=Rc67H1HDEjDy3HjQxasxWDB9M7vQy15mNKQuX9FUK1U=; b=RgDwe3K3Ke2irRAMVA4Yuayg5 BR+M5mJK9AmCzzfU5OcbUqI2BjZcqfev7ed/9vrArbV/YOAew5l297EsE2X6yaD3jvvUrPcrq1UbD 0P5HUDSp+DlQo5Oh5ZIIHk3WkRqA0AovrVcIWw/wslFt9rRqrxSRYh+WCla/VeosnH+2t5io5FTUD g4XnitQYKo7V32SMmUH8yOQJiJA0+r/AIo51eUqqIKzTxr49vPVShhvM/R4RhlrvWT2HXJk+wob6O 2dhMD6nMhbYh9Db8OAsuM1uuqEPVhzBTbbjV/tsTleBfK+Hv567D52zbX6MzjoUBaVHDk/9M3AtgV zaBGfz//w==; Received: from willy by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1hICTv-0003S4-86; Sun, 21 Apr 2019 13:26:07 +0000 Date: Sun, 21 Apr 2019 06:26:07 -0700 From: Matthew Wilcox To: Mike Rapoport 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 Message-ID: <20190421132606.GJ7751@bombadil.infradead.org> References: <20190419094335.GJ18914@techsingularity.net> <20190419140521.GI7751@bombadil.infradead.org> <20190421063859.GA19926@rapoport-lnx> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190421063859.GA19926@rapoport-lnx> User-Agent: Mutt/1.9.2 (2017-12-15) 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 Sun, Apr 21, 2019 at 09:38:59AM +0300, Mike Rapoport wrote: > 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 clearly over-trimmed. The original assumption that Mel had was that DISCONTIGMEM => NUMA, and that's not true on the above six architectures. It is true on i386 ;-)