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[2003:cb:c706:7900:b84d:7f2e:b638:3092]) by smtp.gmail.com with ESMTPSA id u2-20020a7bc042000000b003dd8feea827sm7905363wmc.4.2023.02.03.08.04.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 03 Feb 2023 08:04:03 -0800 (PST) Message-ID: <59630801-42b4-22e8-0ef6-5a5b8636dfbd@redhat.com> Date: Fri, 3 Feb 2023 17:04:01 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.6.0 Subject: Re: [RFC v3 2/4] mm: move PG_slab flag to page_type To: Matthew Wilcox , Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Vlastimil Babka , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Roman Gushchin , =?UTF-8?B?SE9SSUdVQ0hJIE5BT1lBKOWggOWPoyDnm7TkuZ8p?= , Joe Perches , Petr Mladek , Andy Shevchenko , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Alexander Potapenko , Marco Elver References: <20221218101901.373450-1-42.hyeyoo@gmail.com> <20221218101901.373450-3-42.hyeyoo@gmail.com> <15fda061-72d9-2ee9-0e9f-6f0f732a7382@suse.cz> From: David Hildenbrand Organization: Red Hat In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 13D5F2002F X-Stat-Signature: e9jhwqy5zqt7e6ubm77z48h6nsrhiy96 X-Rspam-User: X-HE-Tag: 1675440246-2236 X-HE-Meta: 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 /G3VkLGa 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 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 30.01.23 06:11, Matthew Wilcox wrote: > On Mon, Jan 30, 2023 at 01:34:59PM +0900, Hyeonggon Yoo wrote: >>> Seems like quite some changes to page_type to accomodate SLAB, which is >>> hopefully going away soon(TM). Could we perhaps avoid that? >> >> If it could be done with less changes, I'll try to avoid that. > > Let me outline the idea I had for removing PG_slab: > > Observe that PG_reserved and PG_slab are mutually exclusive. Also, I recall that there are SetPageReserved() calls on pages allocated via slab. -- Thanks, David / dhildenb