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[91.12.107.170]) by smtp.gmail.com with ESMTPSA id h11sm6573479wmq.26.2021.02.18.03.27.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 18 Feb 2021 03:27:16 -0800 (PST) From: David Hildenbrand Mime-Version: 1.0 (1.0) Subject: Re: [PATCH RFC] mm/madvise: introduce MADV_POPULATE to prefault/prealloc memory Date: Thu, 18 Feb 2021 12:27:14 +0100 Message-Id: <254581A8-3108-436F-80AF-129B3F93CBF4@redhat.com> References: <50f73055950ff7382f2194134ef0f439@sf-tec.de> Cc: Vlastimil Babka , David Hildenbrand , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andrew Morton , Arnd Bergmann , Michal Hocko , Oscar Salvador , Matthew Wilcox , Andrea Arcangeli , Minchan Kim , Jann Horn , Jason Gunthorpe , Dave Hansen , Hugh Dickins , Rik van Riel , "Michael S . Tsirkin" , "Kirill A . Shutemov" , Richard Henderson , Ivan Kokshaysky , Matt Turner , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Chris Zankel , Max Filippov , linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org, Linux API In-Reply-To: <50f73055950ff7382f2194134ef0f439@sf-tec.de> To: Rolf Eike Beer X-Mailer: iPhone Mail (18D52) Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Stat-Signature: a4kbowh7endfepzw5hhk8fbquix3h8is X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: F26C7A0009D5 Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf23; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=216.205.24.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1613647640-142657 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: > Am 18.02.2021 um 12:15 schrieb Rolf Eike Beer : >=20 > =EF=BB=BF >>=20 >>> Let's introduce MADV_POPULATE with the following semantics >>> 1. MADV_POPULATED does not work on PROT_NONE and special VMAs. It works >>> on everything else. >>> 2. Errors during MADV_POPULATED (especially OOM) are reported. If we hi= t >>> hardware errors on pages, ignore them - nothing we really can or >>> should do. >>> 3. On errors during MADV_POPULATED, some memory might have been >>> populated. Callers have to clean up if they care. >>> 4. Concurrent changes to the virtual memory layour are tolerated - we > ^t >>> process each and every PFN only once, though. >>> 5. If MADV_POPULATE succeeds, all memory in the range can be accessed >>> without SIGBUS. (of course, not if user space changed mappings in the >>> meantime or KSM kicked in on anonymous memory). >=20 > You are talking both about MADV_POPULATE and MADV_POPULATED here. >=20 Already fixed up :) thanks! > Eike >=20