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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 84014C6379D for ; Fri, 27 Nov 2020 15:00:00 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D264322240 for ; Fri, 27 Nov 2020 14:59:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="M3o2V3LV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D264322240 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id D7F7A6B005C; Fri, 27 Nov 2020 09:59:58 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id D2FF96B006C; Fri, 27 Nov 2020 09:59:58 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C45846B006E; Fri, 27 Nov 2020 09:59:58 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0181.hostedemail.com [216.40.44.181]) by kanga.kvack.org (Postfix) with ESMTP id A88C76B005C for ; Fri, 27 Nov 2020 09:59:58 -0500 (EST) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 6809D180AD820 for ; Fri, 27 Nov 2020 14:59:58 +0000 (UTC) X-FDA: 77530508076.06.nose92_411181d27388 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin06.hostedemail.com (Postfix) with ESMTP id 42A1510035007 for ; Fri, 27 Nov 2020 14:59:58 +0000 (UTC) X-HE-Tag: nose92_411181d27388 X-Filterd-Recvd-Size: 2729 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf15.hostedemail.com (Postfix) with ESMTP for ; Fri, 27 Nov 2020 14:59:57 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1606489196; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=6LNiQ8ZXM8OcHPCX2BFxIKzNPs/e6rdjPX9IsX5bEjg=; b=M3o2V3LV5wl5siiMclRFUfelzmuaTVZKHH0eAu63xIR582r0+sq5CyT1JS/KQ9VP2ATDNY ZkjEvvZtqLtdKSzrxq2qHyB90asifGAe9W1bEOmcn71vWZ5WPBR/qbJ9xaY53jl2WShbUl tUD/+rNA7kq9VPPf8WlEJorWEk7/PR4= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 7CB03ABD7; Fri, 27 Nov 2020 14:59:56 +0000 (UTC) Date: Fri, 27 Nov 2020 15:59:55 +0100 From: Michal Hocko To: Oscar Salvador Cc: david@redhat.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, vbabka@suse.cz, pasha.tatashin@soleen.com Subject: Re: [RFC PATCH v2 1/4] mm,memory_hotplug: Introduce MHP_MEMMAP_ON_MEMORY Message-ID: <20201127145955.GT31550@dhcp22.suse.cz> References: <20201125112048.8211-1-osalvador@suse.de> <20201125112048.8211-2-osalvador@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201125112048.8211-2-osalvador@suse.de> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed 25-11-20 12:20:45, Oscar Salvador wrote: > MHP_MEMMAP_ON_MEMORY tells the system that we want the memmap > pagetables to be built from the hot-added range. > > Signed-off-by: Oscar Salvador This should be folded into the patch which uses the flag. > --- > include/linux/memory_hotplug.h | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h > index 551093b74596..5b1ea1f8d1ab 100644 > --- a/include/linux/memory_hotplug.h > +++ b/include/linux/memory_hotplug.h > @@ -70,6 +70,14 @@ typedef int __bitwise mhp_t; > */ > #define MEMHP_MERGE_RESOURCE ((__force mhp_t)BIT(0)) > > +/* > + * We want memmap (struct page array) to be self contained. > + * To do so, we will use the beginning of the hot-added range to build > + * the page tables for the memmap array that describes the entire range. > + * Only selected architectures support it with SPARSE_VMEMMAP. > + */ > +#define MHP_MEMMAP_ON_MEMORY ((__force mhp_t)BIT(1)) > + > /* > * Extended parameters for memory hotplug: > * altmap: alternative allocator for memmap array (optional) > -- > 2.26.2 -- Michal Hocko SUSE Labs