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=-1.0 required=3.0 tests=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 17F70C33CAF for ; Thu, 23 Jan 2020 09:13:43 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id DB2E922522 for ; Thu, 23 Jan 2020 09:13:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DB2E922522 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 7393B6B0003; Thu, 23 Jan 2020 04:13:42 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 6E9336B0005; Thu, 23 Jan 2020 04:13:42 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5FFDF6B0006; Thu, 23 Jan 2020 04:13:42 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0030.hostedemail.com [216.40.44.30]) by kanga.kvack.org (Postfix) with ESMTP id 47BCD6B0003 for ; Thu, 23 Jan 2020 04:13:42 -0500 (EST) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id 0CC5A6418 for ; Thu, 23 Jan 2020 09:13:42 +0000 (UTC) X-FDA: 76408336284.17.trade82_7793bd4ce2302 X-HE-Tag: trade82_7793bd4ce2302 X-Filterd-Recvd-Size: 3334 Received: from mail-wm1-f66.google.com (mail-wm1-f66.google.com [209.85.128.66]) by imf08.hostedemail.com (Postfix) with ESMTP for ; Thu, 23 Jan 2020 09:13:41 +0000 (UTC) Received: by mail-wm1-f66.google.com with SMTP id q9so1703373wmj.5 for ; 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=ms2yy4EzrjGIHGr4NOJzfCJePRgXFY+hACTbyVkJw2nTzF6SPqGzfYs1QmYKrF7veb zvbY5cq4U8TyY51Bq+ld4wZek5lQMxpYoIXKl2zb3by+gwuvsN3k88YFjPfBTC6FjLTE V8ZusCwP2edmkxzccs8fbUNdSJ4fL/VR964FHCni+WJr+yZnjh0V6AnbyXLAlNy6AquD O+358/X9108vETN/O6EXv/ViEgHbtWAKsp+VRQRih31x25/GhJYrGyZoU/MO9gThMak2 H6OMtHiA69qoU4StLO2Zpf5GmhaegXaDURgwz15BjCH9o9Atm8fCE+A+MhVJC/IAnGb5 mt+g== X-Gm-Message-State: APjAAAVk+l8QPQTiIsksVQ4eObEqkF0XagFJH9IIxXUgH4Ce/5XDmh5c C77MaEMGqV6l71dTLuwMnIw= 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> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000008, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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