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h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=DLdwuFKfXyQYohVa5/G0tTRg6Koz6o8MJ0B3SPXOH3WjJTcE8wOX9ogcbysaONH6O NvIDNmOvJu+h7qhw7Shh/0hRivKcrP2ri4yhbXYEFLZHJlHmk5aRc9xmNNK6iD4UQv 7SNBm27KcvwtFaVVePvTIx6eC7KX6c4QHKmIwRGRAU7sx4iXGdd5KD5ZvylYUkBbZ8 K+M+5vmeXJeDuG/AdJAix0fhxM86Lga74z3pr4GmcGN0TH66qGwJdVm1WzwrvqF4ET gY6KtdW7Qm/jvO4kM7/0fI7HzYqigY+mHLyxheqOmz7uGXprnNyGtkQS2WCzl6jYis JpJKNhQaveRZw== Date: Mon, 10 Feb 2025 17:00:47 +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-Stat-Signature: k466568g457ytfadnx9unzrqqax4gakd X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 598FC10002F X-Rspam-User: X-HE-Tag: 1739206851-955643 X-HE-Meta: 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 1kkA32cv 1ylm7QA1RkeCeGCYbOsAsCNaBuDQdM3McViIrVF4/4Lv066dNHAlMQCW55LEZ4KFrq0ZwsKNLkwy1RwkD27tlBvDcrNL4yQtp8N7RWpPxYL/iUGLw4cWV07278pHzV1tcE0JewLqcrsA5HT1ZuoJgjNb/9UiHJJiRb9s9nrSznPTHZNWYCr6QCm/X4pZONeGTz90Xi+WMPCrjeHGZld40LAGVi+vyrYFgDFPUhjMkEV1gCFkTvsLji9P9NrpXfoL4LvxlFHbrQ1akdsyH/XniNGc2mveRW/wqLGO1 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 02/04, Jaegeuk Kim wrote: > On 01/17, Jaegeuk Kim wrote: > > 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. > > Kindly ping, for the feedback on the direction. If there's demand for something > generalized api, I'm happy to explore. If there's no objection, let me push the change in f2fs and keep an eye on who more will need this in general.