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Fri, 20 Dec 2024 06:08:43 -0500 (EST) Date: Fri, 20 Dec 2024 13:08:39 +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, willy@infradead.org, bfoster@redhat.com, David Hildenbrand , Vlastimil Babka Subject: Re: [PATCH 04/11] mm: add PG_dropbehind folio flag Message-ID: References: <20241213155557.105419-1-axboe@kernel.dk> <20241213155557.105419-5-axboe@kernel.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241213155557.105419-5-axboe@kernel.dk> X-Stat-Signature: gdmsdhf3f6zbir3uiu8qokjsnj96akag X-Rspam-User: X-Rspamd-Queue-Id: BBC0440015 X-Rspamd-Server: rspam08 X-HE-Tag: 1734692902-232939 X-HE-Meta: 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 GA35G/Wz gu4XTLXdCvwxQyHKKiYsdbltwrkKE726EA7LrA8mqr1JNnqc0YZdg0vrZllC1EUDIMymNoecspJSe6tNG5sSDYgjvr1gbaak90B6YTCY8tekp94CUIJAxNpa6OS6425biLLw9dQmm3bQf6ZJf2SAnurv1pW+ebbcmJstja0nYrwzwxbAmpLfK2rn5xXiYUvCm3md/FEuWzkOB8uweOUMUIOhKShVoTkN1TmA4vC52P0HsmmY9rUrGe60A5v4g9DXITDDipm3DDrRlPaR3prTF6WVEgACPj9c1u5uOg5hNW5yvRCkjpv3aSc4WWhtW4xwcl6WMpU/fXJObnumd91gW2mTqJ2baF4FmxTTVLfFjuXqJe38r6lMtaRKxed+rOO9Z5s5ze4N0OPGgV3aCi/Slg7NPvmq0xT1Q3xC4TGomYkPOiZutZeov+TpVLg== 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, Dec 13, 2024 at 08:55:18AM -0700, Jens Axboe wrote: > Add a folio flag that file IO can use to indicate that the cached IO > being done should be dropped from the page cache upon completion. > > Signed-off-by: Jens Axboe Reviewed-by: Kirill A. Shutemov + David, Vlastimil. I think we should consider converting existing folio_set_reclaim() / SetPageReclaim() users to the new flag. From a quick scan, all of them would benefit from dropping the page after writeback is complete instead of leaving the folio on the LRU. -- Kiryl Shutsemau / Kirill A. Shutemov