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b=jRr7GJAhGlahPzN0bmeBXmtT0my8GCvw8BEnvoA0LHYmPZeF2NiGk/GoK4nW4iAI2 ah3DD6/iXQ06gmV829oiq4bltVzTjc4l9q/dzZxerNzX0v35Ht2iMEHMJ2Emrqt67I MC9X0Ve2SmiTTeUv8lJORBTKQNvbigYOqlPLtBZtmWYaZSp8lVMgMDzjob8fkxb5hQ FvBEW+y9hVHlppwfRLE2LN/rhcRUt55KCb8XV4FkKz5AVg1tN2pOESYeRx/RNoE2m0 aY4/qERt8Yjo9xLdjWHct8cXrh7SN9YUdfxwFBPRCtp+SF81vbpHlwAfuGPCj/WoLj oqBb9fXdQZb2Q== Date: Wed, 27 May 2026 15:42:07 +0000 From: Jaegeuk Kim To: Christoph Hellwig Cc: Matthew Wilcox , Theodore Tso , linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-mm@kvack.org, Akilesh Kailash , linux-fsdevel@vger.kernel.org, Christian Brauner Subject: Re: [f2fs-dev] [PATCH v2] f2fs: another way to set large folio by remembering inode number Message-ID: References: <20260521155748.GA79343@macsyma-wired.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam11 X-Stat-Signature: 5x3de4dm7e7y5t1y5ds9dq7oq8maif79 X-Rspamd-Queue-Id: 2C61740004 X-Rspam-User: X-HE-Tag: 1779896530-726678 X-HE-Meta: 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 Ejo8X5UG 7WCAut3wK2c5gLd08P3NvdHYEJfm7gxqY1TcXHjBolJ+VXpE8g9/KgvAelPhglfIfLxPM3G54pUoiKCQUUF+5wGYBMbT0YJzEadcGX3gIXeaBusVhbNPHwCZqBvMTed999A94eP7iVfJvGGNrRG7xKkPub6rx8PWqz/dkECXzlfgakICaZFGJFv5nF1vaczWxKUF1smlWwTXaYnNAuUN7FwEYMjYfVQOKuLsYHjpJeZDMWlUtVh4+m/fnthwMEANC2gIH0P+oYADPzaiX1S0LkwS8M8eaNyOOACC8H/SfAzteDMH1jvAomT4IgQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 05/26, Christoph Hellwig wrote: > On Tue, May 26, 2026 at 03:31:08AM +0100, Matthew Wilcox wrote: > > > > And what are you trying to say us with that? > > > > > > This means, high-order pages were used up by EROFS which sets large folio by > > > default. So, I wanted to say the concern was based on actual data which was what > > > Mattew asked. > > > > This isn't that though. What you actually need is to show that high order > > allocations are _failing_. > > Exactly. > > > If what you want is large folios readily available, then what you want > > is large folios used _everywhere_ because then they're easy to get! > > Yes. > > > If there's small folios in use, you need to reclaim a lot of memory in > > order to reassemble large folios (it's the birthday paradox, similar to > > the hash collision problem). > > Yeah. Although it seems we have an issue with > order costly folios > at the moment, but we should fix this. > > And f2fs really needs to up the game and support large folios fully > so that we can run that kind of analysis there as well, without this > all this is just piling hacks on top of other hacks. Ok, I'll revisit the large folio support in f2fs, and try to revisit the problem afterwards. Thanks, > > > _______________________________________________ > Linux-f2fs-devel mailing list > Linux-f2fs-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel