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=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 01FB1C2D0DB for ; Thu, 23 Jan 2020 09:13:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C68E124683 for ; Thu, 23 Jan 2020 09:13:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579770823; bh=WRzwJNR6jg+B3HOocJRb5HPmGvFQ1z/4qJ6S0Sl0M/c=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=vD2y610mqCVliQYTyrT3iL9qiL5f9nKQBSugFxphkEbPrJRUArquVB+ji5tJGUkAz 9yzroE8Pp83atYzjysdB78TSBVoogz4uqkE3s7i+yGFQ7ddirs1gWvDag1sgfmAedz 3eZap6v3IgDLZfN5xOv5xG1EM8oMbeDj6CMlEDVE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726792AbgAWJNn (ORCPT ); Thu, 23 Jan 2020 04:13:43 -0500 Received: from mail-wm1-f67.google.com ([209.85.128.67]:52231 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725785AbgAWJNm (ORCPT ); Thu, 23 Jan 2020 04:13:42 -0500 Received: by mail-wm1-f67.google.com with SMTP id p9so1716727wmc.2; Thu, 23 Jan 2020 01:13:41 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=SPWcVpEqvJz7GbyQVkDaNDKstaVbETmXMkdMpDNo2i8=; b=S7QUpyDkF/OGTMIK5+k+x2kyLXtQ1rgU/bV2fXZ1M5sXE1mlR+EsxMviA1/W4qiG69 WAMmCxm8uaYb1PlKa3aJwbyk3nXyr57e6xqIyrdRRlI+b/bVeYEqgrYi7jGnYjYeN5YH ZDDQiGegblG9bzrzAtP//N2dAS34YBlDj/EBf1cjNAuKTbwImEpg4mx+cFCdHr7nt2zk fjsksBJPjcXPwLFT/t3bI5sNV5lr4wPa+LPgcZ6vZZRhuLV5zdOBNjBvSvXum5Gogz/C mk8fKPvt7U+ITKcHO/cUADi++orgyGJqsIhyh3QwRo/go8C0cIHrgaLIgZEfER5LJlva Vs8Q== X-Gm-Message-State: APjAAAUZ1TX3B8lHRzAtjGAPlSJEwv/cLMYV+nDMzi9079m6yhHiyCet UFX8MFRjlwauXcMoUpXbDCQ= X-Google-Smtp-Source: APXvYqxcYhcAWeRgYJpVo8HYAfmCV39KAnYESYEedoa8zu1GS1GiJSAtq9Gy4H1+2j3pOg4pwIhUvA== X-Received: by 2002:a05:600c:10cd:: with SMTP id l13mr3152431wmd.102.1579770820674; Thu, 23 Jan 2020 01:13:40 -0800 (PST) Received: from localhost (prg-ext-pat.suse.com. [213.151.95.130]) by smtp.gmail.com with ESMTPSA id g21sm1846838wmh.17.2020.01.23.01.13.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Jan 2020 01:13:39 -0800 (PST) Date: Thu, 23 Jan 2020 10:13:39 +0100 From: Michal Hocko To: Minchan Kim Cc: sspatil@google.com, kirill@shutemov.name, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, oleksandr@redhat.com, surenb@google.com, timmurray@google.com, dancol@google.com, sonnyrao@google.com, bgeffon@google.com, hannes@cmpxchg.org, shakeelb@google.com, joaodias@google.com, ktkhai@virtuozzo.com, christian.brauner@ubuntu.com, sjpark@amazon.de Subject: Re: [PATCH v2 2/5] mm: introduce external memory hinting API Message-ID: <20200123091339.GI29276@dhcp22.suse.cz> References: <20200116235953.163318-3-minchan@kernel.org> <20200117115225.GV19428@dhcp22.suse.cz> <20200117155837.bowyjpndfiym6cgs@box> <20200117173239.GB140922@google.com> <20200117212653.7uftw3lk35oykkmb@box> <20200119161431.GA94410@google.com> <20200120075825.GH18451@dhcp22.suse.cz> <20200121183212.GF140922@google.com> <20200122082853.GS29276@dhcp22.suse.cz> <20200123014131.GA249784@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200123014131.GA249784@google.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed 22-01-20 17:41:31, Minchan Kim wrote: [...] > What do you want to see further? Either a consensus that it is sufficient to have an inherently racy interface that requires some form of external sychronization or a robust interface that can cope with races in a sensible way. And no, having a flag for future extension is definitely not the way how a new API should be added. Seriously! -- Michal Hocko SUSE Labs