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[195.135.220.15]) by mx.google.com with ESMTPS id i4si420252edg.192.2019.04.25.22.25.22 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 25 Apr 2019 22:25:22 -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 DC3ACAD2B; Fri, 26 Apr 2019 05:25:21 +0000 (UTC) Date: Fri, 26 Apr 2019 07:25:20 +0200 From: Michal Hocko To: Matthew Garrett Cc: linux-mm@kvack.org, Linux Kernel Mailing List , Linux API Subject: Re: [PATCH V2] mm: Allow userland to request that the kernel clear memory on release Message-ID: <20190426052520.GB12337@dhcp22.suse.cz> References: <20190424211038.204001-1-matthewgarrett@google.com> <20190425121410.GC1144@dhcp22.suse.cz> <20190425123755.GX12751@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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 Thu 25-04-19 13:39:01, Matthew Garrett wrote: > On Thu, Apr 25, 2019 at 5:37 AM Michal Hocko wrote: > > Besides that you inherently assume that the user would do mlock because > > you do not try to wipe the swap content. Is this intentional? > > Yes, given MADV_DONTDUMP doesn't imply mlock I thought it'd be more > consistent to keep those independent. Do we want to fail madvise call on VMAs that are not mlocked then? What if the munlock happens later after the madvise is called? -- Michal Hocko SUSE Labs