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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,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 03EF2C636C8 for ; Fri, 16 Jul 2021 01:12:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DCFF5613DA for ; Fri, 16 Jul 2021 01:12:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232865AbhGPBPL (ORCPT ); Thu, 15 Jul 2021 21:15:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60108 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229603AbhGPBPI (ORCPT ); Thu, 15 Jul 2021 21:15:08 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D859BC06175F for ; Thu, 15 Jul 2021 18:12:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=STY4s5pzqccUtW+qUB1iOKanwmw+wdA3y3vXLfLdfbo=; b=fvA4DkjoQc5jRbwwnORSkc+2RS dMu+N4IcPWmrBB4oqNjXs8Uw0+hbjStd8LcCifGczeAWaxme+hvi2/B6DGhGXy+J1TL2iKNsAoYBp 2nHAtsE21mBSqygEAxDCaBpGSoNW5as3HRKs6jSoQ4ijgM42JVm8rknq6YLFvpfcwKqPFOqHP5w+T wqmSBseyLqFVVW+06V3a6WoIJEkFoQg7mrRn5Gs/lW830upV2QcxX8sQcLYYIXpX1QDoD2+W4aSTj MohRgBrC5dqnuGd9j8T10c/D1V9xVcvZH4oieM3YmvCh2UhBnAfK6rOmWQF4cbAy7lR5ME0tgmnuz lw9nDyxA==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1m4CNP-0041Of-73; Fri, 16 Jul 2021 01:11:16 +0000 Date: Fri, 16 Jul 2021 02:10:51 +0100 From: Matthew Wilcox To: Dave Hansen Cc: Andrew Morton , Huang Ying , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Dave Hansen , yang.shi@linux.alibaba.com, rientjes@google.com, dan.j.williams@intel.com, david@redhat.com, osalvador@suse.de, weixugc@google.com, Michal Hocko , Yang Shi , Zi Yan Subject: Re: [PATCH -V10 0/9] Migrate Pages in lieu of discard Message-ID: References: <20210715055145.195411-1-ying.huang@intel.com> <20210715123836.ad76b0a2e29c0bbd3cd67767@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 15, 2021 at 02:42:07PM -0700, Dave Hansen wrote: > The end game for auto-migration is to on by default, wherever these > hardware configurations show up. Just like THP, I expect this to be > broadly useful. But, given the breadth of our user base, I also expect > it to be nasty for a minority of users. They'll need a way to turn it > off, and hopefully they'll also provide feedback so that, if possible, > we can improve the default behavior and bring them back into the fold. ... or if the THP experience is anything to go by, they continue to shout loudly about how borken it is for a decade ;-(