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bh=3gHZrGopRj+/QtDb/9N2USnjAmR/1np+CUt5Rx5vS9w=; b=caF/oSETzApJmuRC5VDdcjQAl8SK+i7GM+TUYttFanaBHLN/w6+f58MPD37O8NxvZbOIHw B4fBq5By1DemO2rScyNJJhahcBT92H+ynAErH1OLU/oVYK/ZkmnV/NOvTZAI/y19NKgD6s qz/GI9gKm6cumjxJ+g0CFOZJdMNFPAA= 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-241-CWsEjFvDOfab41_2em0s8w-1; Mon, 10 Aug 2020 03:56:44 -0400 X-MC-Unique: CWsEjFvDOfab41_2em0s8w-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6078B800474; Mon, 10 Aug 2020 07:56:42 +0000 (UTC) Received: from [10.36.113.172] (ovpn-113-172.ams2.redhat.com [10.36.113.172]) by smtp.corp.redhat.com (Postfix) with ESMTP id 181075D9E7; Mon, 10 Aug 2020 07:56:33 +0000 (UTC) Subject: Re: [PATCH v4 0/6] mm / virtio-mem: support ZONE_MOVABLE To: linux-kernel@vger.kernel.org, Andrew Morton References: <20200804194142.28279-1-david@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200804194142.28279-1-david@redhat.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Cc: Pankaj Gupta , Michal Hocko , Baoquan He , "Michael S. Tsirkin" , virtualization@lists.linux-foundation.org, linux-mm@kvack.org, Qian Cai , Mike Rapoport , Mike Rapoport , Mike Kravetz X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" On 04.08.20 21:41, David Hildenbrand wrote: > @Andrew can we give this a churn and consider it for v5.9 in case there > are no more comments? @Andrew, Ping, so I assume we'll target v5.10? > > Patch #1-#4,#6 have RBss or ACKs, patch #5 is virtio-mem stuff maintained > by me (and MST is aware). > > --- > > When introducing virtio-mem, the semantics of ZONE_MOVABLE were rather > unclear, which is why we special-cased ZONE_MOVABLE such that partially > plugged blocks would never end up in ZONE_MOVABLE. > > Now that the semantics are much clearer (and are documented in patch #6), > let's support partially plugged memory blocks in ZONE_MOVABLE, allowing > partially plugged memory blocks to be online to ZONE_MOVABLE and also > unplugging from such memory blocks. This avoids surprises when onlining > of memory blocks suddenly fails, just because they are not completely > populated by virtio-mem (yet). > > This is especially helpful for testing, but also paves the way for > virtio-mem optimizations, allowing more memory to get reliably unplugged. > > Cleanup has_unmovable_pages() and set_migratetype_isolate(), providing > better documentation of how ZONE_MOVABLE interacts with different kind of > unmovable pages (memory offlining vs. alloc_contig_range()). > > v3 -> v4: > - "mm/page_isolation: drop WARN_ON_ONCE() in set_migratetype_isolate()" > -- Fix typo in description > - "virtio-mem: don't special-case ZONE_MOVABLE" > -- Add more details why we initialli special-cased ZONE_MOVABLE (via MST) > - "mm: document semantics of ZONE_MOVABLE" > -- Rephrase some parts of documentation (via Mike) > > v2 -> v3: > - "mm: document semantics of ZONE_MOVABLE" > -- Fix a typo > > v1 -> v2: > - "mm/page_isolation: don't dump_page(NULL) in set_migratetype_isolate()" > -- Move to position 1, add Fixes: tag > -- Drop unused "out:" label > - "mm/page_isolation: drop WARN_ON_ONCE() in set_migratetype_isolate()" > -- Keep curly braces on "else" case > - Replace "[PATCH v1 5/6] mm/page_alloc: restrict ZONE_MOVABLE optimization > in has_unmovable_pages() to memory offlining" > by "mm: document semantics of ZONE_MOVABLE" > -- Brain dump of what I know about ZONE_MOVABLE > > David Hildenbrand (6): > mm/page_isolation: don't dump_page(NULL) in set_migratetype_isolate() > mm/page_alloc: tweak comments in has_unmovable_pages() > mm/page_isolation: drop WARN_ON_ONCE() in set_migratetype_isolate() > mm/page_isolation: cleanup set_migratetype_isolate() > virtio-mem: don't special-case ZONE_MOVABLE > mm: document semantics of ZONE_MOVABLE > > drivers/virtio/virtio_mem.c | 47 +++++++------------------------------ > include/linux/mmzone.h | 35 +++++++++++++++++++++++++++ > mm/page_alloc.c | 22 +++++------------ > mm/page_isolation.c | 39 ++++++++++++++---------------- > 4 files changed, 66 insertions(+), 77 deletions(-) > -- Thanks, David / dhildenb _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization