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Fri, 8 Nov 2024 14:25:33 -0500 (EST) Date: Fri, 8 Nov 2024 21:25:30 +0200 From: "Kirill A. Shutemov" To: Jens Axboe Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, hannes@cmpxchg.org, clm@meta.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH 03/13] mm: add PG_uncached page flag Message-ID: References: <20241108174505.1214230-1-axboe@kernel.dk> <20241108174505.1214230-4-axboe@kernel.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241108174505.1214230-4-axboe@kernel.dk> X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 2DA59C0008 X-Stat-Signature: 3msh7yw163e7ukchffspxsg79ehr8d5o X-Rspam-User: X-HE-Tag: 1731093900-206270 X-HE-Meta: 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 jvyIz0DI zdyD+D6agehWsjV5Zrc84SjWuoDWNC9pIZAoKuw4EixVSE7MLoqaBb4ukNm0M8j9j23WQ2JhERAQbeB5cq/pBq49m6wFSr93jZE+NGENvZ74auJPuCLOXKVD1WJs0H09momFCGI5WnkJbxSz7nM3Guavhzq9V0zfVm8bJEmSIWo3I9Wx/9y3/DPSKXk3mvYj8OkLb7tAoeloBP8yWZRtddrq4Rclq78lwVYtgChCvOlRE4E3NW9bxvVG6EEBMdenSUSAvM8Cpf44bWXZyiHTm3L/4xynSldGRarEohSjLSWPXTcU9yowHpgtMmaJNgd+RdWJa2w7wI7jDMcchqtuKP8ztbySbj6ZToTb33idmxUX+/Tx8LTjepGY3jLQZ57DihD6uV9IBcdCGVHTCMuunu6SVqVGqZWXfF2+ZKgY1KfwOmlkpBa8EcJk97OIKmhfR5L6y1JLGtcxvf5c= 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, Nov 08, 2024 at 10:43:26AM -0700, Jens Axboe wrote: > Add a page flag that file IO can use to indicate that the IO being done > is uncached, as in it should not persist in the page cache after the IO > has been completed. Flag bits are precious resource. It would be nice to re-use an existing bit if possible. PG_reclaim description looks suspiciously close to what you want. I wounder if it would be valid to re-define PG_reclaim behaviour to drop the page after writeback instead of moving to the tail of inactive list. -- Kiryl Shutsemau / Kirill A. Shutemov