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b=YvC/ZXmQy/UI/n7UEmqmFhKXCQqFLoft41IaIEt96y8IYO/kIq26qxnidq1YP6Ek7 fPPvEYvIZvip5712h5y5P9whbfeukKXnoHdQVbP8erZtDZzIHh4fZ0gjStkuswJ08y dR18apYB5mqA2QKdTt43zg/7WHGAWIO4H1LLZ0mQZ+JnoYFrzFs1/dN5tCylPNWJ3s NFKVrVz5SGhi3+tcN/5ozF46va10ge2x2+WKwdRxcsXuHN46LVe8sKENXmerYWWUql 3NqexdFJbzAGOHCxO+AdowcAHITO+j86ZKbHU5CmG9ebVAX/ra4hQ5F6G87r9bRQi1 NzpTUGQp2xNig== Date: Fri, 17 Jan 2025 20:37:05 +0000 From: Jaegeuk Kim To: Matthew Wilcox Cc: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH 0/2 v6] add ioctl/sysfs to donate file-backed pages Message-ID: References: <20250117164350.2419840-1-jaegeuk@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 36C54100007 X-Stat-Signature: 497d3h6bqyjmj58bioe9gdu5ngze6naq X-Rspamd-Server: rspam08 X-Rspam-User: X-HE-Tag: 1737146228-485820 X-HE-Meta: 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 SxC5xAY3 HuxFUj4lmPabBMQYeZht4fKWP3FQG8ZKXwkN2QwXsZ0EiuppTZNxecUdH0s7g6czR7MwzXu2CsogjFmpYN8gMe8wpvfipeFdfkpo1mTUQyQwATgULyclF7AQvIsEKplHaEMti5lwCFETt9Hk0UoF2bxaGseua9J9TpzQxyYJLmqmhs+EEr1RrkdImiOJUYPEXYLd76Fa9TLXffSmOI9C7Y7pgF7BmLxSyKVEsGWVn7sc2G3/vDGcm6WQkoYjF72RPAkIwoC9/N2/GPuKSDVukdUZYOmQJ1FIKKTMr 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: List-Subscribe: List-Unsubscribe: On 01/17, Matthew Wilcox wrote: > On Fri, Jan 17, 2025 at 06:48:55PM +0000, Jaegeuk Kim wrote: > > > I don't understand how this is different from MADV_COLD. Please > > > explain. > > > > MADV_COLD is a vma range, while this is a file range. So, it's more close to > > fadvise(POSIX_FADV_DONTNEED) which tries to reclaim the file-backed pages > > at the time when it's called. The idea is to keep the hints only, and try to > > reclaim all later when admin expects system memory pressure soon. > > So you're saying you want POSIX_FADV_COLD? Yeah, the intention looks similar like marking it cold and paging out later.