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[91.12.101.77]) by smtp.gmail.com with ESMTPSA id v18sm501361wml.44.2021.09.27.13.45.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 27 Sep 2021 13:45:40 -0700 (PDT) Subject: Re: Struct page proposal To: Linus Torvalds , Kent Overstreet Cc: Vlastimil Babka , linux-fsdevel , Linux Kernel Mailing List , Linux-MM , Johannes Weiner , Matthew Wilcox , Andrew Morton , "Darrick J. Wong" , Christoph Hellwig , David Howells References: From: David Hildenbrand Organization: Red Hat Message-ID: <9e3b16f6-bb54-5bcc-1664-2ecb61424018@redhat.com> Date: Mon, 27 Sep 2021 22:45:39 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 893CB10000B2 X-Stat-Signature: b91rir5ekc4zgnpk3pa7gpkf1an6fok8 Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=XDCilIPn; dmarc=pass (policy=none) header.from=redhat.com; spf=none (imf12.hostedemail.com: domain of david@redhat.com has no SPF policy when checking 216.205.24.124) smtp.mailfrom=david@redhat.com X-HE-Tag: 1632775544-973177 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 27.09.21 20:34, Linus Torvalds wrote: > On Mon, Sep 27, 2021 at 10:54 AM Kent Overstreet > wrote: >> >> That list_head is the problematic one. Why do we need to be able to take a page >> from the middle of a freelist? > > At least for the merging with the buddy page case. And alloc_contig_range(), page reporting, page poisioning ... and probably more. -- Thanks, David / dhildenb