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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 EEA19C433DB for ; Fri, 5 Feb 2021 08:56:39 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4B5CC64E4A for ; Fri, 5 Feb 2021 08:56:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4B5CC64E4A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id A268A6B0075; Fri, 5 Feb 2021 03:56:38 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 9D6B96B007B; Fri, 5 Feb 2021 03:56:38 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8D0D26B0075; Fri, 5 Feb 2021 03:56:38 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0059.hostedemail.com [216.40.44.59]) by kanga.kvack.org (Postfix) with ESMTP id 764BB6B0075 for ; Fri, 5 Feb 2021 03:56:38 -0500 (EST) Received: from smtpin23.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 403B18249980 for ; Fri, 5 Feb 2021 08:56:38 +0000 (UTC) X-FDA: 77783608476.23.pest02_1c0602c275e3 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin23.hostedemail.com (Postfix) with ESMTP id 2346E37606 for ; Fri, 5 Feb 2021 08:56:38 +0000 (UTC) X-HE-Tag: pest02_1c0602c275e3 X-Filterd-Recvd-Size: 2685 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf15.hostedemail.com (Postfix) with ESMTP for ; Fri, 5 Feb 2021 08:56:37 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 52615AD37; Fri, 5 Feb 2021 08:56:36 +0000 (UTC) Date: Fri, 5 Feb 2021 09:56:33 +0100 From: Oscar Salvador To: Miaohe Lin Cc: Muchun Song , duanxiongchun@bytedance.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, paulmck@kernel.org, mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com, rdunlap@infradead.org, oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de, almasrymina@google.com, rientjes@google.com, willy@infradead.org, mhocko@suse.com, song.bao.hua@hisilicon.com, david@redhat.com, naoya.horiguchi@nec.com Subject: Re: [PATCH v14 6/8] mm: hugetlb: introduce nr_free_vmemmap_pages in the struct hstate Message-ID: <20210205085632.GC13848@linux> References: <20210204035043.36609-1-songmuchun@bytedance.com> <20210204035043.36609-7-songmuchun@bytedance.com> <42c8272a-f170-b27e-af5e-a7cb7777a728@huawei.com> <20210205082211.GA13848@linux> <435f3c32-0694-7af4-9032-0653a28a6a99@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <435f3c32-0694-7af4-9032-0653a28a6a99@huawei.com> User-Agent: Mutt/1.10.1 (2018-07-13) 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 Fri, Feb 05, 2021 at 04:39:26PM +0800, Miaohe Lin wrote: > Hi: > On 2021/2/5 16:22, Oscar Salvador wrote: > > On Fri, Feb 05, 2021 at 03:29:43PM +0800, Miaohe Lin wrote: > >>> + if (likely(vmemmap_pages > RESERVE_VMEMMAP_NR)) > >>> + h->nr_free_vmemmap_pages = vmemmap_pages - RESERVE_VMEMMAP_NR; > >> > >> Not a problem. Should we set h->nr_free_vmemmap_pages to 0 in 'else' case explicitly ? > > > > No, hstate fields are already zeroed. > > I know hstate fields are already zeroed. What I mean is should we set nr_free_vmemmap_pages > to 0 _explicitly_ like nr_huge_pages and free_huge_pages in hugetlb_add_hstate() ? > But this is really trival. We do not anny more [1] [1] https://patchwork.kernel.org/project/linux-mm/patch/20201119112141.6452-1-osalvador@suse.de/ -- Oscar Salvador SUSE L3