There What is (directly or indirectly) way to compress data in page cachean alternative for zcache?

In addition, seek times are lower because compression reduces the physical distances between logical blocks of data on the disk, and the disk buffer’s hit rate improves since it is able to store more data in the same amount of space (note that we’re talking about the hard drive’s buffer – this last advantage does not apply to the buffer cache since ZFS decompresses blocks before saving them in the cache).

above text come from:https://www.citusdata.com/blog/2013/04/30/zfs-compression/

Seem compress of ZFS not working forI want to use a high-speed swap device or zram as page cache"page cache"?

There is similar ways is feasible for, so that page cache?(zcache alrady discontinued)data can be dropped automatically when the system is out of memory.

Newest good English version of this question Apparently, zcache has been discontinued. Is there an available alternative? If yes, which one?

Thank Marc.2377bcache provide the newest good Englishdoesn't seem to drop data when there's no memory available.

There is (directly or indirectly) way to compress data in page cache?

In addition, seek times are lower because compression reduces the physical distances between logical blocks of data on the disk, and the disk buffer’s hit rate improves since it is able to store more data in the same amount of space (note that we’re talking about the hard drive’s buffer – this last advantage does not apply to the buffer cache since ZFS decompresses blocks before saving them in the cache).

above text come from:https://www.citusdata.com/blog/2013/04/30/zfs-compression/

Seem compress of ZFS not working for page cache?

There is similar ways is feasible for page cache?(zcache alrady discontinued)

Newest good English version of this question

Thank Marc.2377 provide the newest good English.