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[79.242.57.171]) by smtp.gmail.com with ESMTPSA id vr3sm4406332ejb.124.2020.10.17.00.39.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 17 Oct 2020 00:39:39 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: David Hildenbrand Mime-Version: 1.0 (1.0) Subject: Re: [PATCH v1 05/29] virtio-mem: generalize check for added memory Date: Sat, 17 Oct 2020 09:39:38 +0200 Message-Id: <2E12AC3C-872A-4B30-8FD7-12420FA1D14E@redhat.com> References: <20201016223811.GJ44269@L-31X9LVDL-1304.local> Cc: David Hildenbrand , linux-kernel@vger.kernel.org, linux-mm@kvack.org, virtualization@lists.linux-foundation.org, Andrew Morton , "Michael S . Tsirkin" , Jason Wang , Pankaj Gupta In-Reply-To: <20201016223811.GJ44269@L-31X9LVDL-1304.local> To: Wei Yang X-Mailer: iPhone Mail (18A393) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Am 17.10.2020 um 00:38 schrieb Wei Yang : >=20 > =EF=BB=BFOn Fri, Oct 16, 2020 at 12:32:50PM +0200, David Hildenbrand wrote= : >>>>> Ok, I seems to understand the logic now. >>>>>=20 >>>>> But how we prevent ONLINE_PARTIAL memory block get offlined? There are= three >>>>> calls in virtio_mem_set_fake_offline(), while all of them adjust page'= s flag. >>>>> How they hold reference to struct page? >>>>=20 >>>> Sorry, I should have given you the right pointer. (similar to my other >>>> reply) >>>>=20 >>>> We hold a reference either via >>>>=20 >>>> 1. alloc_contig_range() >>>=20 >>> I am not familiar with this one, need to spend some time to look into. >>=20 >> Each individual page will have a pagecount of 1. >>=20 >>>=20 >>>> 2. memmap init code, when not calling generic_online_page(). >>>=20 >>> I may miss some code here. Before online pages, memmaps are allocated in= >>> section_activate(). They are supposed to be zero-ed. (I don't get the ex= act >>> code line.) I am not sure when we grab a refcount here. >>=20 >> Best to refer to __init_single_page() -> init_page_count(). >>=20 >> Each page that wasn't onlined via generic_online_page() has a refcount >> of 1 and looks like allocated. >>=20 >=20 > Thanks, I see the logic. >=20 > online_pages() > move_pfn_range_to_zone() --- 1) > online_pages_range() --- 2) >=20 > At 1), __init_single_page() would set page count to 1. At 2), > generic_online_page() would clear page count, while the call back would no= t. >=20 > Then I am trying to search the place where un-zero page count prevent offl= ine. > scan_movable_pages() would fail, since this is a PageOffline() and has 1 p= age > count. >=20 > So the GUARD we prevent offline partial-onlined pages is >=20 > (PageOffline && page_count) >=20 > And your commit aa218795cb5fd583c94f >=20 > mm: Allow to offline unmovable PageOffline() pages via MEM_GOING_OFFLINE >=20 > is introduced to handle this case. >=20 > That's pretty clear now. >=20 I=E2=80=98m happy to see that I am no longer the only person that understand= s all this magic :) Thanks for having a look / reviewing! >> --=20 >> Thanks, >>=20 >> David / dhildenb >=20 > --=20 > Wei Yang > Help you, Help me >=20 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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 3782FC43457 for ; 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