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[195.135.220.15]) by mx.google.com with ESMTPS id a7si1231375edl.383.2019.01.30.10.16.35 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 30 Jan 2019 10:16:35 -0800 (PST) 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 7CA96B01B; Wed, 30 Jan 2019 18:16:34 +0000 (UTC) Date: Wed, 30 Jan 2019 19:16:30 +0100 From: Michal Hocko To: Tejun Heo Cc: Johannes Weiner , Chris Down , Andrew Morton , Roman Gushchin , Dennis Zhou , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, kernel-team@fb.com Subject: Re: [PATCH 2/2] mm: Consider subtrees in memory.events Message-ID: <20190130181630.GF18811@dhcp22.suse.cz> References: <20190128151859.GO18811@dhcp22.suse.cz> <20190128154150.GQ50184@devbig004.ftw2.facebook.com> <20190128170526.GQ18811@dhcp22.suse.cz> <20190128174905.GU50184@devbig004.ftw2.facebook.com> <20190129144306.GO18811@dhcp22.suse.cz> <20190129145240.GX50184@devbig004.ftw2.facebook.com> <20190130165058.GA18811@dhcp22.suse.cz> <20190130170658.GY50184@devbig004.ftw2.facebook.com> <20190130174117.GC18811@dhcp22.suse.cz> <20190130175222.GA50184@devbig004.ftw2.facebook.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190130175222.GA50184@devbig004.ftw2.facebook.com> 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 30-01-19 09:52:22, Tejun Heo wrote: > On Wed, Jan 30, 2019 at 06:41:17PM +0100, Michal Hocko wrote: > > But we are discussing the file name effectively. I do not see a long > > term maintenance burden. Confusing? Probably yes but that is were the > > Cost on user side. > > > documentation would be helpful. > > which is an a lot worse option with way higher total cost. And how exactly does the cost get any smaller with a mount option. The consumer of the API will likely not know there are two modes and check for it to figure out how to interpret those values. Or maybe I still do not follow how exactly is the mount option supposed to work. -- Michal Hocko SUSE Labs