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Received: from willy by casper.infradead.org with local (Exim 4.98 #2 (Red Hat Linux)) id 1tYrdq-00000001jzm-3Ntm; Fri, 17 Jan 2025 19:04:26 +0000 Date: Fri, 17 Jan 2025 19:04:26 +0000 From: Matthew Wilcox To: Jaegeuk Kim 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: gpsssidw36b1osiwkdh19mhih6napcnu X-Rspam-User: X-Rspamd-Queue-Id: CE61E80016 X-Rspamd-Server: rspam03 X-HE-Tag: 1737140668-275119 X-HE-Meta: U2FsdGVkX1+uzb90vo6Pi6HI0aAKoKA+60+q3CbqQz/0tjdSzTP6QvD9W2Vsplzc+toFX317oOiSZ+Sv/7EcC5Y/6beHfxMnitJYW90hv5sPEvL2d7rHD6jm61hCZtOWQv0C1Q184bGwi7QPsS8ecxQov8pIg/wQ5reTgqQfqHLouhCtNwPWA+2YOHsI8eNm/vqntE1XRFQEGj1ayPhbphk1eUf/ka1FuamV9LqNPzF0UfKEYiHLbRRyUSA3M9voBy3BwrqjKo5AJSKJc4lUkJ4SnOeybi674y9gOA8QbyKU+blvl3moMvqRype7QAFmSqibXyiyla3C9ikE3gMMBB3rJ3zf/zbifswSKhmo36r0wDg3tccZRIsIE2yUM7JrNO37yl2BP42aRuXQkQ+CeRZ8wItvrWJvZUQrRRxHu5Ns5XVoy8kfF5W5sjvEzOsK3cktazZ6JxUNtGzEXIF+oKfQHYdo7YKsUFkSRK0isOOYt4z1wNRYtvrE/n2t5t/rubyGD1WPAQMKNou2zZNSPHYwlt8MsTakSTT62KFsnPdkDdZvZbWUHYa9Byn06vwMhwIF5Z5zdD/oo9eGXM2+r2mIigAhLoksfihZDbK5f7DH2xcccBqeY92AaKGvgM5sxEJCmNhxIkuz4JGVFuc1w7l3QGb5Y6ymLGqvOIITRw8CRenu8MeA6cvc/7fpJ1wNGtvJlcoIxXsgxeenT4sF86y6YBeHDlrbpIw8yD3u5O71S9XX0lOQ9+julmbilGOV92reEIVwAMLdDDSFrmkvR4UUWX1W2TQyHTLHSO2LwDvet1Y8gnrCsOal+p3E4A9EyHOlRCSpxeyM4oFFOIHBlZBkGsGQnj9OBjA2IrFj6UK0dH5AqOt6YVb5PNyojt+0bGLRqFYLV3+oA4NF3+IQlQybDpVaQ4odyXCniRhwmydRXqkhhqVP74A0YS+dWyZ/qAq+ruBjsM5P1OXDGw5 a+tG45CR Z4H2MBE1nKkpV+cQIsY6Wt1b4EuclX0dP0PQh8Hyq+k0NMWs9BhI2vwJMoRGQPX3GaI097OcoWzQwtZ5ayFIya9M4ZvTXXQHZwNwNaJux0CozLeDUJ4hHmE/64lrrj2EbKGFjt9KXzIeFo0MzLOHGcveEEh65SzVwNaD6iWkIF3S+DKjCFajR2snwratJTSN4RkqWCfJbqdm8IEX0RD7lx7asl9fWzI0GZzc3 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 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?