On Tue, 2011-11-01 at 11:10 -0700, Dan Magenheimer wrote:

Case A) CONFIG_FRONTSWAP=n
Case B) CONFIG_FRONTSWAP=y and no tmem backend registers
Case C) CONFIG_FRONTSWAP=y and a tmem backend DOES register

...

The point is that only Case C has possible interactions
so Case A and Case B end-users and kernel developers need
not worry about the maintenance. 

I'm personally evaluating this as if all the distributions would turn it
on.  I'm evaluating as if every one of my employer's systems ships with
it and as if it is =y my laptop.  Basically, I'm evaluating A/B/C and
only looking at the worst-case maintenance cost (C).  In other words,
I'm ignoring A/B and assuming wide use.

I'm curious where you expect to see the code get turned on and used
since we might be looking at this from different angles.

-- Dave

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