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=-2.2 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=unavailable 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 BBCCAC04AAB for ; Tue, 7 May 2019 17:36:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 87211205C9 for ; Tue, 7 May 2019 17:36:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Lv9eHU/Y" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727458AbfEGRg5 (ORCPT ); Tue, 7 May 2019 13:36:57 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:47702 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726378AbfEGRg5 (ORCPT ); Tue, 7 May 2019 13:36:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.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:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=clVmOpDd5LzvkH+bJWwETDAH6oZsPTXJW+h72BQ3YmA=; b=Lv9eHU/YCnEEcZbzOeCcafBMF OswjYy2ZYStFugMU0UuKCzCEoJL1SeV8aIwcRB9okQqJ9hF87xa9smgAI1nlogUPWbQt2/csogLsh klr5i5nLmuZlcA3EdxtfOlQsI/rKdwxGZAQBVMngU6fNViPjUE0ZjFowgSXAg8QafQF6y/1aUavH0 DUg3anwUIkMdltSZOAIXMEjLKzAr+mCBhyHfLIPctmeSOWVj0/hAbr7k51DT5uC3RrDFnyzw4TvKi S0nHugtqx5JMKIFWALxBGRckiMkHDJtdM0Xq80o6t5HYCsbAMDW/hJD8IlHtxEyO7TF0+zvLtkShr WlE47EP3Q==; Received: from willy by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1hO41Q-0000Zl-4S; Tue, 07 May 2019 17:36:56 +0000 Date: Tue, 7 May 2019 10:36:55 -0700 From: Matthew Wilcox To: Michal Hocko Cc: Sasha Levin , Linus Torvalds , Alexander Duyck , LKML , stable , Mikhail Zaslonko , Gerald Schaefer , Mikhail Gavrilov , Dave Hansen , Alexander Duyck , Pasha Tatashin , Martin Schwidefsky , Heiko Carstens , Andrew Morton , Sasha Levin , linux-mm Subject: Re: [PATCH AUTOSEL 4.14 62/95] mm, memory_hotplug: initialize struct pages for the full memory section Message-ID: <20190507173655.GA1403@bombadil.infradead.org> References: <20190507053826.31622-1-sashal@kernel.org> <20190507053826.31622-62-sashal@kernel.org> <20190507170208.GF1747@sasha-vm> <20190507171806.GG1747@sasha-vm> <20190507173224.GS31017@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190507173224.GS31017@dhcp22.suse.cz> User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 07, 2019 at 07:32:24PM +0200, Michal Hocko wrote: > On Tue 07-05-19 13:18:06, Sasha Levin wrote: > > Michal, is there a testcase I can plug into kselftests to make sure we > > got this right (and don't regress)? We care a lot about memory hotplug > > working right. > > As said in other email. The memory hotplug tends to work usually. It > takes unexpected memory layouts which trigger corner cases. This makes > testing really hard. Can we do something with qemu? Is it flexible enough to hotplug memory at the right boundaries?