Ulrich Spörlein wrote:
On Wed, 06.01.2010 at 16:27:09 -0800, Julian Elischer wrote:
Pieter de Goeje wrote:
Because when you "erase" something, all it does is unlink (delete the
reference to) the data. So there is currently no way the memory disk can free
the memory associated with the data. That is also why you should normally use
swap backed memory disks instead, or use tmpfs. These can return memory to
the system.
The ability of the filesystem to mark certain blocks as "erased" is important
not only for memory disks but also for solid state drives. It is a feature
UFS2 is currently lacking unfortunately.
but is being worked on
Will this automagically work for md(4) backed UFS2 file-systems? Is this
also being worked on?
that will depend on md
there are two patches out there that use the VFS DELETE command under
UFS to free unused space. how that operation is handled depends on the
lower level.
Disclaimer: I have seen the patches but are not using them. I believe
Mav and Jeff have both looked at this and Kirk showed a path that was
similar to Jeff's.
Regards,
Uli
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