Lee Revell wrote:
On Nov 15, 2007 5:24 PM, Stefan Monnier <[email protected]> wrote:
[ I realize this is probably better implemented outside of the kernel, but
it seems like it might be of interest here. Please redirect me to
a more appropriate place if you can think of one (other than
/dev/null that is). ]
It would require some kernel support to reclaim the storage from the
caching application rather than returning -ENOSPC when a "normal" app
needs the storage. Even if you make the caching app free the space by
itself you need a kernel mechanism to signal it when this happens.
In particular, you need a way to hold off the "real" application until
disk reclaim is done.
If you do it purely in userspace (asynchronously) then it's subject to
ENOSPC while the reclaimer runs.
This, by the way, has been discussed on and off -- often in the context
of undelete (which is an identical problem.) The problem usually is
that performance of real storage users suffer because of locality
issues. However, flash storage doesn't have locality requirements...
-hpa
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