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=-7.4 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 2C2C4C48BE6 for ; Wed, 16 Jun 2021 08:36:05 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C2156610CA for ; Wed, 16 Jun 2021 08:36:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C2156610CA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 06B606B006C; Wed, 16 Jun 2021 04:36:04 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 01BB66B006E; Wed, 16 Jun 2021 04:36:03 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DD7856B0070; Wed, 16 Jun 2021 04:36:03 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0149.hostedemail.com [216.40.44.149]) by kanga.kvack.org (Postfix) with ESMTP id AC87F6B006C for ; Wed, 16 Jun 2021 04:36:03 -0400 (EDT) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 3F09DB7B2 for ; Wed, 16 Jun 2021 08:36:03 +0000 (UTC) X-FDA: 78258929406.13.3F362B6 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by imf18.hostedemail.com (Postfix) with ESMTP id 7BBF9200109C for ; Wed, 16 Jun 2021 08:35:53 +0000 (UTC) Received: from imap.suse.de (imap-alt.suse-dmz.suse.de [192.168.254.47]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 604D7218EF; Wed, 16 Jun 2021 08:36:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1623832561; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=WpwWJbbtKDFq0LT6lzpD9iRvLN/Y2hzAGAL9x1GzMXI=; b=GqmM3W9jqtg9amOXzrtpy1yTl3bBFO3KAybWdsg4IC1Qv7FCVBB2nLXco30LCG31cVeHkH uTLB0z5NP/3CwNkc/dPDTMVexbEKejwSnot5gBtKHXuJOQ313lu3LG5HSdnUtATirQUcWj KqY54sHwdA0pY+haY3u+In4JsU/ro1A= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1623832561; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=WpwWJbbtKDFq0LT6lzpD9iRvLN/Y2hzAGAL9x1GzMXI=; b=VZ5jeBZw9+qGfzd7wLy7xRuF90LK+I+roENfph52Xni1FODD7HCzFfjzcDwEM2+VgJSpx4 w+bEghGFA5gxbRDA== Received: from imap3-int (imap-alt.suse-dmz.suse.de [192.168.254.47]) by imap.suse.de (Postfix) with ESMTP id 3CCE8118DD; Wed, 16 Jun 2021 08:36:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1623832561; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=WpwWJbbtKDFq0LT6lzpD9iRvLN/Y2hzAGAL9x1GzMXI=; b=GqmM3W9jqtg9amOXzrtpy1yTl3bBFO3KAybWdsg4IC1Qv7FCVBB2nLXco30LCG31cVeHkH uTLB0z5NP/3CwNkc/dPDTMVexbEKejwSnot5gBtKHXuJOQ313lu3LG5HSdnUtATirQUcWj KqY54sHwdA0pY+haY3u+In4JsU/ro1A= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1623832561; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=WpwWJbbtKDFq0LT6lzpD9iRvLN/Y2hzAGAL9x1GzMXI=; b=VZ5jeBZw9+qGfzd7wLy7xRuF90LK+I+roENfph52Xni1FODD7HCzFfjzcDwEM2+VgJSpx4 w+bEghGFA5gxbRDA== Received: from director2.suse.de ([192.168.254.72]) by imap3-int with ESMTPSA id KoxcDvG3yWBfDQAALh3uQQ (envelope-from ); Wed, 16 Jun 2021 08:36:01 +0000 Subject: Re: [PATCH] mm: Mark idle page tracking as BROKEN To: Yu Zhao , David Hildenbrand Cc: akpm@linuxfoundation.org, Linux-MM , Heiko Carstens , Rafael Aquini , Vladimir Davydov , "Kirill A . Shutemov" , Andrea Arcangeli , Donald Dutile , Matthew Wilcox References: <20210612000714.775825-1-willy@infradead.org> From: Vlastimil Babka Message-ID: Date: Wed, 16 Jun 2021 10:36:00 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=GqmM3W9j; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=VZ5jeBZw; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=GqmM3W9j; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=VZ5jeBZw; dmarc=none; spf=pass (imf18.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.28 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Rspamd-Server: rspam02 X-Stat-Signature: idj8pyc7crykft17myz6btwf8ihpbhes X-Rspamd-Queue-Id: 7BBF9200109C X-HE-Tag: 1623832553-775245 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 6/16/21 8:22 AM, Yu Zhao wrote: > On Tue, Jun 15, 2021 at 8:55 PM Matthew Wilcox wrote: >> >> >> I don't know. I asked the others on the call and the answer I got was >> essentially "Just delete it". >> >> I'm kind of hoping the others speak up. > > I listed a couple of things when acking this patch. Being broken is > not a problem as long as there are users who care about it. What made > me think such users may not exist is that nobody ever complained about > those things until we stumbled on them -- I'm not insisting on > deleting this feature, just clarifying why I thought so. Similar feelings here. On the call it looked like the feature was abandoned by its creators, and it wasn't clear if the distros that had it enabled did so due to reasons that still apply for future versions. Sending the proposal and getting a feedback that there are users is one of the expected valid outcomes. > The real question is how well we want to support it. My understanding, > based on the previous discussion, is "as-is". That is we simply follow > the current "semantics" when converting it to using folios. >