On 13 Feb 2024, at 7:30, Pankaj Raghav (Samsung) wrote: > Hi Zi yan, > >> From: Zi Yan <ziy@xxxxxxxxxx> >> >> Hi all, >> >> File folio supports any order and people would like to support flexible orders >> for anonymous folio[1] too. Currently, split_huge_page() only splits a huge >> page to order-0 pages, but splitting to orders higher than 0 is also useful. >> This patchset adds support for splitting a huge page to any lower order pages >> and uses it during file folio truncate operations. >> > > I recently posted patches to enable block size > page size(Large Block > Sizes) in XFS[1]. > The main idea of LBS is to have a notion of minimum order in the > page cache that corresponds to the filesystem block size. > > Ability to split a folio based on a given order is something that would > definitely optimize the LBS implementation. > > The current implementation refuses to split a large folio if it has a > minimum order set in the page cache [2]. What we would like to have instead > is to split it based on the minimum order. The main use is of course being > able to free some folios during partial truncate operation. > > Your patch was also suggested by willy during our LPC talk[3]. > > I tried rebasing your patch and there were a lot of non-trivial conflicts. > Is there any plans on sending a new version? Sure. I am going to rebase and send a new version out. > > > [1] https://lore.kernel.org/linux-xfs/20240213093713.1753368-1-kernel@xxxxxxxxxxxxxxxx/ > [2] https://lore.kernel.org/linux-xfs/20240213093713.1753368-9-kernel@xxxxxxxxxxxxxxxx/ > [3] https://youtu.be/ar72r5Xf7x4?si=XDb-g7SSIgS-5TkP&t=1457 > > -- > Pankaj -- Best Regards, Yan, Zi
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