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=-8.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 62F25C18E5B for ; Mon, 16 Mar 2020 07:15:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3BF8120663 for ; Mon, 16 Mar 2020 07:15:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="GVR2OVGV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729832AbgCPHO7 (ORCPT ); Mon, 16 Mar 2020 03:14:59 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:43616 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728302AbgCPHO6 (ORCPT ); Mon, 16 Mar 2020 03:14:58 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1584342897; h=from:from:reply-to:subject:subject: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=JPNnOddM2c90CWFUfutbV41h/MSedE2cTHjorY7SiB4=; b=GVR2OVGVSiyuz3ouQ9lCLOTgpvSmKkXg5jw1vJEu3iup3OSwEJ3/UIaXbtncIWFCASIvnf TYeCkNwjgo2vKM55fSULBPYRDZyJFeVatItpLQK8mQrnX80BORi47Y4/zKDE4mKjQB7E4c rsqGfcOnSv4BH20Z4skHGR6Mrt0IvAA= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-233-S2ZhaITeMfu5QyHDlb3BYA-1; Mon, 16 Mar 2020 03:14:54 -0400 X-MC-Unique: S2ZhaITeMfu5QyHDlb3BYA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4DAE3107ACC9; Mon, 16 Mar 2020 07:14:53 +0000 (UTC) Received: from localhost (ovpn-12-129.pek2.redhat.com [10.72.12.129]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 7866F5C1B2; Mon, 16 Mar 2020 07:14:49 +0000 (UTC) Date: Mon, 16 Mar 2020 15:14:47 +0800 From: Baoquan He To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, willy@infradead.org, linux-mm@kvack.org, mhocko@suse.com, akpm@linux-foundation.org, richard.weiyang@gmail.com Subject: Re: [PATCH v3] mm/sparse.c: Use kvmalloc_node/kvfree to alloc/free memmap for the classic sparse Message-ID: <20200316071447.GD3486@MiWiFi-R3L-srv> References: <20200312130822.6589-1-bhe@redhat.com> <20200312141749.GL27711@MiWiFi-R3L-srv> <5c6351e9-1539-40c9-0057-cc58116ecc3a@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5c6351e9-1539-40c9-0057-cc58116ecc3a@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/13/20 at 04:04pm, David Hildenbrand wrote: > On 12.03.20 15:17, Baoquan He wrote: > > This change makes populate_section_memmap()/depopulate_section_memmap > > much simpler. > > > > Suggested-by: Michal Hocko > > Signed-off-by: Baoquan He > > --- > > v2->v3: > > Remove __GFP_NOWARN and use array_size when calling kvmalloc_node() > > per Matthew's comments. > > > > mm/sparse.c | 27 +++------------------------ > > 1 file changed, 3 insertions(+), 24 deletions(-) > > > > diff --git a/mm/sparse.c b/mm/sparse.c > > index bf6c00a28045..bb99633575b5 100644 > > --- a/mm/sparse.c > > +++ b/mm/sparse.c > > @@ -734,35 +734,14 @@ static void free_map_bootmem(struct page *memmap) > > struct page * __meminit populate_section_memmap(unsigned long pfn, > > unsigned long nr_pages, int nid, struct vmem_altmap *altmap) > > { > > - struct page *page, *ret; > > - unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION; > > - > > - page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size)); > > - if (page) > > - goto got_map_page; > > - > > - ret = vmalloc(memmap_size); > > - if (ret) > > - goto got_map_ptr; > > - > > - return NULL; > > -got_map_page: > > - ret = (struct page *)pfn_to_kaddr(page_to_pfn(page)); > > -got_map_ptr: > > - > > - return ret; > > + return kvmalloc_node(array_size(sizeof(struct page), > > + PAGES_PER_SECTION), GFP_KERNEL, nid); > > > Indentation of the parameters looks wrong/weird. Maybe just calculate > memmap_size outside of the call, makes it easier to read IMHO. I'll fix the indentation issue. Adding variable memmap_size seems not so necessary. > > Apart from that, looks good to me. > > Reviewed-by: David Hildenbrand > > -- > Thanks, > > David / dhildenb