Received: by 2002:a25:4158:0:0:0:0:0 with SMTP id o85csp252286yba; Thu, 25 Apr 2019 22:35:33 -0700 (PDT) X-Google-Smtp-Source: APXvYqwpBxQnNZUZ9v8KjYyrDdlCKPubjWn8emDOuou2rt0pR29RqPNYBe2GFJuVKrLnBB/rvHrl X-Received: by 2002:a17:902:2a4b:: with SMTP id i69mr43779935plb.292.1556256933558; Thu, 25 Apr 2019 22:35:33 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1556256933; cv=none; d=google.com; s=arc-20160816; b=gcXagZVXmEe3h7uYkKC+n3z9kTZTZN/ewErvzDqdJsHkfyv37fY4NsuqEGq9kPvmFq 2YgJGyQeh0w4/bQurV24hBD6ybUxIPXiLmXI5gY6ZZff9K1rrdNgGRjEbwVBF9QTHD+y GdETH87XBD10lzdlGASq9mRtR86tC2PN0Naja2WHNiWXJkKFE7hhuEnogWuXTMWKv5vb Cwle8aqObW3iWfbUzuvW4SEUNsbUgZrqeisyUYNTEEp/JwDeNntE4on7FVXfH79uxVUP 6/nMTNajeyfJOyYKyLyhNQNNCJluAEsRMdLb3Xv6atkSSyeNV/vY8+uHUatwbbaTzR6H bJEg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date; bh=C+p7fomEgPNJYoFX151pymwK7KQuUXLVfehBIWkBdmk=; b=a1oaJ0VnjUhgcJLuYsUzym5ZCrDHfF8F/02fNDBLSJRzr8cFjTZ2eB7mtHcEi2asKn lD7LyIZZV2hsNYey0I7sLT7BKtFBWb2ddtLfjr9JFvyiqSfMU1NmEqk5rdQQ0WulDTS8 VqEGsJ9FfDWNe5mOjR7dCMGDNNiUiTjlKLbPQaoMtFoUrgRiZrbseFj+m3sld1n5POVD 9VA9n4iwPhYQ6G6YwNfE8lkrlM7JeZzg5n/+PNaF9x/cu8nEtADbU8JEIPSrnd1vlz50 ZE9dp9nX/pg3QxS1JaHnPZrh8yiiKXBo7Ke/tcbp6b1j+DVy360qTmT22tSOs2Pt4S2K Zc7Q== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id w17si1091198plq.307.2019.04.25.22.35.18; Thu, 25 Apr 2019 22:35:33 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729368AbfDZFZX (ORCPT + 99 others); Fri, 26 Apr 2019 01:25:23 -0400 Received: from mx2.suse.de ([195.135.220.15]:42092 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725881AbfDZFZX (ORCPT ); Fri, 26 Apr 2019 01:25:23 -0400 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) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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