Hi Naohiro. Naohiro Aota - 06.02.20, 11:41:54 CET: > This series refactors chunk allocation, device_extent allocation and > extent allocation functions and make them generalized to be able to > implement other allocation policy easily. > > On top of this series, we can simplify some part of the "btrfs: zoned > block device support" series as adding a new type of chunk allocator > and extent allocator for zoned block devices. Furthermore, we will be > able to implement and test some other allocator in the idea page of > the wiki e.g. SSD caching, dedicated metadata drive, chunk allocation > groups, and so on. Regarding SSD caching, are you aware that there has been previous work with even involved handling part of it in the Virtual Filesystem Switch (VFS)? VFS hot-data tracking, LWN article: https://lwn.net/Articles/525651/ Patchset, not sure whether it is the most recent one: [PATCH v2 00/12] VFS hot tracking https://lore.kernel.org/linux-btrfs/1368493184-5939-1-git-send-email-zwu.kernel@xxxxxxxxx/ So for SSD caching you may be able to re-use or pick up some of this work, unless it would be unsuitable to be used with this new approach. Thanks, -- Martin
