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[198.145.29.99]) by mx.google.com with ESMTPS id c36si8536598pgl.287.2019.07.12.07.37.38 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 12 Jul 2019 07:37:38 -0700 (PDT) Received-SPF: pass (google.com: domain of will@kernel.org designates 198.145.29.99 as permitted sender) client-ip=198.145.29.99; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=oSDuCh7A; spf=pass (google.com: domain of will@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=will@kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from willie-the-truck (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 997A82080A; Fri, 12 Jul 2019 14:37:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562942258; bh=Q0fQ8cIZPQQvRl+HqtEP93tavumXUJrRQeEzq/T0ZjU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=oSDuCh7A+Xs42MXbXEieBsFty+Z7wObUN12OgwqLbOFW9oih/BmQBTm6f9I5uATLs k3FxtcxVs2OyWqrnzMXueSISfTrdrWEpEWu7/gxb4zS9dLiXyM0oMjuEOYKj4+vyf3 slAytCaCOnyinCVXlJAAWb5BUeKOp+4U+rFpZcIw= Date: Fri, 12 Jul 2019 15:37:30 +0100 From: Will Deacon To: Michal Hocko Cc: Hoan Tran OS , Catalin Marinas , Heiko Carstens , "open list:MEMORY MANAGEMENT" , Paul Mackerras , "H . Peter Anvin" , "sparclinux@vger.kernel.org" , Alexander Duyck , "linux-s390@vger.kernel.org" , Michael Ellerman , "x86@kernel.org" , Mike Rapoport , Christian Borntraeger , Ingo Molnar , Vlastimil Babka , Benjamin Herrenschmidt , Open Source Submission , Pavel Tatashin , Vasily Gorbik , Will Deacon , Borislav Petkov , Thomas Gleixner , "linux-arm-kernel@lists.infradead.org" , Oscar Salvador , "linux-kernel@vger.kernel.org" , Andrew Morton , "linuxppc-dev@lists.ozlabs.org" , "David S . Miller" , willy@infradead.org Subject: Re: [PATCH v2 0/5] mm: Enable CONFIG_NODES_SPAN_OTHER_NODES by default for NUMA Message-ID: <20190712143730.au3662g4ua2tjudu@willie-the-truck> References: <1562887528-5896-1-git-send-email-Hoan@os.amperecomputing.com> <20190712070247.GM29483@dhcp22.suse.cz> <586ae736-a429-cf94-1520-1a94ffadad88@os.amperecomputing.com> <20190712121223.GR29483@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190712121223.GR29483@dhcp22.suse.cz> User-Agent: NeoMutt/20170113 (1.7.2) 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: Hi all, On Fri, Jul 12, 2019 at 02:12:23PM +0200, Michal Hocko wrote: > On Fri 12-07-19 10:56:47, Hoan Tran OS wrote: > [...] > > It would be good if we can enable it by-default. Otherwise, let arch > > enables it by them-self. Do you have any suggestions? > > I can hardly make any suggestions when it is not really clear _why_ you > want to remove this config option in the first place. Please explain > what motivated you to make this change. Sorry, I think this confusion might actually be my fault and Hoan has just been implementing my vague suggestion here: https://lore.kernel.org/linux-arm-kernel/20190625101245.s4vxfosoop52gl4e@willie-the-truck/ If the preference of the mm folks is to leave CONFIG_NODES_SPAN_OTHER_NODES as it is, then we can define it for arm64. I just find it a bit weird that the majority of NUMA-capable architectures have to add a symbol in the arch Kconfig file, for what appears to be a performance optimisation applicable only to ia64, mips and sh. At the very least we could make the thing selectable. Will