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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id e22si4947338pgi.66.2019.04.19.07.05.29 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 19 Apr 2019 07:05:29 -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=jTOIGU81; 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=8GHfViN1qI7tP5bjrRTuauCJlfPJIop88X8YcwvDN6s=; b=jTOIGU81UGM+SZeugfFRNRueG l6N+dMe5L8tE+LsbrB8ff0RI23zdhq6sMGzaJL9CqIcSoEsKeE+4mKtV6w04nWSC7qRYvmWsX4qVv Em6ez34lCyAWPmoo4haiEBl4pAP0PH4JLNkC+J77nltznW7JRNaHYaUvM5IoJDhTTIt9fWrjgAVWX Is1aHcSYYpXbYDLQcz5qHAlAfHu6Ej/IcDznFo6/qIoVShfVOmTYM2vgrmAG/mFYR9pCVl8JRV8eu HeKPmAjiFhTEbg9PgKdqcVA72Lz8X+M7ZlBEd2a/rQHpy56woJi6su9wdmYLTprp8Drt48ag2WAIl /o7GbTcpA==; Received: from willy by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1hHU8n-0006OX-Cm; Fri, 19 Apr 2019 14:05:21 +0000 Date: Fri, 19 Apr 2019 07:05:21 -0700 From: Matthew Wilcox To: Mel Gorman Cc: Andrew Morton , Mikulas Patocka , James Bottomley , linux-parisc@vger.kernel.org, linux-mm@kvack.org, Vlastimil Babka , LKML , linux-arch@vger.kernel.org Subject: DISCONTIGMEM is deprecated Message-ID: <20190419140521.GI7751@bombadil.infradead.org> References: <20190419094335.GJ18914@techsingularity.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190419094335.GJ18914@techsingularity.net> 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 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) I'm not sure that these architecture maintainers even know that DISCONTIGMEM is deprecated. Adding linux-arch to the cc.