Re: Questions on nilfs_cleanerd

[Gordan Bobic <gordan-UpbECiGlrmGsTnJN9+BGXg@public.gmane.org>]

These sound similar to the questions/concerns I raised a while back.

> 1) Does the daemon read/write the entire drive to look for dead blocks to clean?

Yes - sequentially (and then it rolls over to the beginning again).

> 2) What if there aren't any dead blocks to clean and the free space in
> the drive is still less than 10% (the default min_clean_segments in
> the conf file), does the daemon still process the drive? If so, how do
> I change the cleaning interval so that it doesn't process the drive as
> often?

The only worthwhile suggestion I heard is to set the minimum history 
retention rate (the FS is continuously snapshotting) to 1 day. That way 
you can guarantee the churn rate will never exceed the capacity of the 
disk per day. Not ideal, but at least it puts some kind of a hard limit 
on how quickly it'll waste your flash - at the expense of making the 
problem of the non-determinism of free space a little worse.

Gordan
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