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42b9995f88
Traditionally, unused inodes would be held on the superblock inode cache until the associated on-disk file is removed or the kernel requests reclaim. On filesystems with millions of rarely-used files, this can be a lot of unusable memory. Here we implement the superblock drop_inode method, and add a zfs_delete_inode tunable to control its behaviour. By default it continues the traditional behaviour, but when the tunable is enabled, we signal that the inode should be deleted immediately when the last reference is dropped, rather than cached. This releases the associated data to the dbuf cache and ARC, allowing them to be reclaimed normally. Sponsored-by: Klara, Inc. Sponsored-by: Fastmail Pty Ltd Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Closes #17746 |
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