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[195.135.220.15]) by mx.google.com with ESMTPS id z4si30361ejb.370.2019.05.14.23.53.16 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 14 May 2019 23:53:17 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 15111AE5D; Wed, 15 May 2019 06:53:16 +0000 (UTC) Date: Wed, 15 May 2019 08:53:11 +0200 From: Michal Hocko To: Oleksandr Natalenko Cc: linux-kernel@vger.kernel.org, Kirill Tkhai , Vlastimil Babka , Matthew Wilcox , Pavel Tatashin , Timofey Titovets , Aaron Tomlin , Grzegorz Halat , linux-mm@kvack.org, linux-api@vger.kernel.org, Hugh Dickins Subject: Re: [PATCH RFC v2 0/4] mm/ksm: add option to automerge VMAs Message-ID: <20190515065311.GB16651@dhcp22.suse.cz> References: <20190514131654.25463-1-oleksandr@redhat.com> <20190514144105.GF4683@dhcp22.suse.cz> <20190514145122.GG4683@dhcp22.suse.cz> <20190515062523.5ndf7obzfgugilfs@butterfly.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190515062523.5ndf7obzfgugilfs@butterfly.localdomain> User-Agent: Mutt/1.10.1 (2018-07-13) 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 15-05-19 08:25:23, Oleksandr Natalenko wrote: [...] > > > Please make sure to describe a usecase that warrants adding a new > > > interface we have to maintain for ever. > > I think of two major consumers of this interface: > > 1) hosts, that run containers, especially similar ones and especially in > a trusted environment; > > 2) heavy applications, that can be run in multiple instances, not > limited to opensource ones like Firefox, but also those that cannot be > modified. This is way too generic. Please provide something more specific. Ideally with numbers. Why those usecases cannot use an existing interfaces. Remember you are trying to add a new user interface which we will have to maintain for ever. I will try to comment on the interface itself later. But I have to say that I am not impressed. Abusing sysfs for per process features is quite gross to be honest. -- Michal Hocko SUSE Labs