nilfs_cleanerd using a lot of disk-write bandwidth

[Gordan Bobic <gordan@xxxxxxxxxx>]

Hi,

I'm seeing nilfs_cleanerd using a lot of disk write bandwidth according 
to iotop. It seems to be performing approximately equal amounts of reads 
and writes when it is running. Reads I can understand, but why is it 
writing so much in order to garbage collect? Should it not be just 
trying to mark blocks as free? The disk I/O r/w symmetry implies that it 
is trying to do something like defragment the file system. Is there a 
way to configure this behaviour in some way? The main use-case I have 
for nilfs is cheap flash media that suffers from terrible random-write 
performance, but on such media this many writes are going to cause media 
failure very quickly. What can be done about this?

Gordan
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