From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5AD8FC4360F for ; Sun, 24 Mar 2019 14:44:08 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id F36D5222EA for ; Sun, 24 Mar 2019 14:44:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F36D5222EA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=hallyn.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 3F2C46B0003; Sun, 24 Mar 2019 10:44:07 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3A1DB6B0006; Sun, 24 Mar 2019 10:44:07 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 244806B0007; Sun, 24 Mar 2019 10:44:07 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) by kanga.kvack.org (Postfix) with ESMTP id CA7916B0003 for ; Sun, 24 Mar 2019 10:44:06 -0400 (EDT) Received: by mail-wm1-f69.google.com with SMTP id t18so2137315wmj.3 for ; Sun, 24 Mar 2019 07:44:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:date:from:to :cc:subject:message-id:references:mime-version:content-disposition :in-reply-to:user-agent; bh=0yIfHbHAo2NF7XwDo1oKLIsjcSMuaDKl8bKZdw8OthQ=; b=G5NYwaRFtqPZR+XJzA0pfJjhGUqVp5Gt5TsfUt4FaSdxrxSSQPaRq0oEdL5pTimDv8 xC3x6XkzWMuzp9uT7oyHBK0kw2ooB6MRmfSaoYOZDeiqVUMgvBoaatjryZSObyMzEETb pLB1toa9JImMoj3x2bmu8nnZQoZSWOVl9de+c3P/pBemjj+lSsQesrgEjzsezwBopmaR /J7A9jjJHup6F+bLBg2ZmC5DL7mQuVn/e+MSZOSLuMqfW/SYwYZNnT7YhKG4M4uxCjQC LbcI9to4xEOK0vutM7x+BSa+57/rismnMKlht3SVbTUJLRT5IgNlORiBqkCGX6Hy6cOo qXtQ== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of serge@mail.hallyn.com designates 178.63.66.53 as permitted sender) smtp.mailfrom=serge@mail.hallyn.com X-Gm-Message-State: APjAAAVF5xGUD8BntSAaR42b06STHem5muzjzSSelhV45ig4Ox4aI9G0 pz8ckX9HawQ9lsN65GHifYUAL/ax7NGwbiWf8bchihXTH8zXfA0oZ1AMR4NBrgtQNgEXcmn0184 OpFUTWhTOGLfr8boyUIynkz60mmNE2P7rC4JhKeinV1+XJMzCTsdlmXbj+u24Ms0dBg== X-Received: by 2002:adf:b68d:: with SMTP id j13mr8079838wre.50.1553438646237; Sun, 24 Mar 2019 07:44:06 -0700 (PDT) X-Google-Smtp-Source: APXvYqzsis7g4813nd5xqJqCbQd3hbqlplCzEevoVK8FCFuoc5C8cidSeAZw648Oi7SsDyRsfFSM X-Received: by 2002:adf:b68d:: with SMTP id j13mr8079806wre.50.1553438645348; Sun, 24 Mar 2019 07:44:05 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1553438645; cv=none; d=google.com; s=arc-20160816; b=O8hhqOgzkRg7ZJAL0HLCe+8bdFtcigd/8JjDmNkarxS8ZTq500CSsTG/vijKTg9dvP xkF5JSXwuZdKifLraUsT/F26QHfS79U2+m9m/UflK2naVTP7CWrR6GJ2kgnT/WaKpdCV ncTf2ZMo00Ki7iFl6OznjSBeu2o0JbRP3GrUnlySO54BRqoHc2HgQdvVU2hEVarPCD9U qaEWszh0a/K1rYOYIaVo+sjVgXcCzvTSP6jhfHAb3NpREpWTsEXXBC0937ZLsYWRbtWL ADfw79UqSUAf/g8ryqsaI8jNRchCM5LkJtakSt+ru3MVaDi9y8JwjwiyEPu2oWZ47fhv CIzQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=user-agent:in-reply-to:content-disposition:mime-version:references :message-id:subject:cc:to:from:date; bh=0yIfHbHAo2NF7XwDo1oKLIsjcSMuaDKl8bKZdw8OthQ=; b=F8Y9wUba4XczF+valAwQEdtCjTP352Ff/oJ2/64+5CADnpJdPv48qkad7RZEfRsjpO h1SE7aJoHFy8q7WC2T9F+GZnwjBjVyBckHadMFm31/7JEpxS9wOTr24PneeICGBIqcUQ L8vKlZeY04LngsHo35TtxLu2hwdy47vACmXOEOarIIkPlBx5Pc+U7CTTttPk9UTcFUWp in/klpFNOfh5TQoRy6FcJ7pFQF5S43DElGo2aDB/+qxjKSULGwPLlhwe/td8/N+Lq2KA 7lhWZ2RbvJJNtLexQlpPsDfV+HvBA9FQyDt+U9dKMZP191TNX9otMwx+QxKgjURcfeyc hM3w== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of serge@mail.hallyn.com designates 178.63.66.53 as permitted sender) smtp.mailfrom=serge@mail.hallyn.com Received: from mail.hallyn.com (mail.hallyn.com. [178.63.66.53]) by mx.google.com with ESMTPS id y4si6463115wrt.288.2019.03.24.07.44.05 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 24 Mar 2019 07:44:05 -0700 (PDT) Received-SPF: pass (google.com: domain of serge@mail.hallyn.com designates 178.63.66.53 as permitted sender) client-ip=178.63.66.53; Authentication-Results: mx.google.com; spf=pass (google.com: domain of serge@mail.hallyn.com designates 178.63.66.53 as permitted sender) smtp.mailfrom=serge@mail.hallyn.com Received: by mail.hallyn.com (Postfix, from userid 1001) id C7E72E; Sun, 24 Mar 2019 09:44:04 -0500 (CDT) Date: Sun, 24 Mar 2019 09:44:04 -0500 From: "Serge E. Hallyn" To: Daniel Colascione Cc: Christian Brauner , Joel Fernandes , Suren Baghdasaryan , Steven Rostedt , Sultan Alsawaf , Tim Murray , Michal Hocko , Greg Kroah-Hartman , Arve =?iso-8859-1?B?SGr4bm5lduVn?= , Todd Kjos , Martijn Coenen , Ingo Molnar , Peter Zijlstra , LKML , "open list:ANDROID DRIVERS" , linux-mm , kernel-team , Oleg Nesterov , Andy Lutomirski , "Serge E. Hallyn" , Kees Cook Subject: Re: pidfd design Message-ID: <20190324144404.GA32603@mail.hallyn.com> References: <20190319231020.tdcttojlbmx57gke@brauner.io> <20190320015249.GC129907@google.com> <20190320035953.mnhax3vd47ya4zzm@brauner.io> <4A06C5BB-9171-4E70-BE31-9574B4083A9F@joelfernandes.org> <20190320182649.spryp5uaeiaxijum@brauner.io> <20190320185156.7bq775vvtsxqlzfn@brauner.io> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) 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, Mar 20, 2019 at 12:29:31PM -0700, Daniel Colascione wrote: > On Wed, Mar 20, 2019 at 11:52 AM Christian Brauner wrote: > > I really want to see Joel's pidfd_wait() patchset and have more people > > review the actual code. > > Sure. But it's also unpleasant to have people write code and then have > to throw it away due to guessing incorrectly about unclear > requirements. No, it is not. It is not unpleasant. And it is useful. It is the best way to identify and resolve those incorrect guesses and unclear requirements.