[Linux Kernel, GPL-only] mm: Change global memory state symbols to GPL-only

[kernelOfTruth]

Could the following change be of concern (in case spl or some part of zfs rely on it) ?

http://marc.info/?l=linux-kernel&m=143968216905052&w=2

Proprietary modules should not be able to touch vm_stat or participate
in shrinking.

[behlendorf]

Thanks for pointing me to this thread. Yes this potentially of major concern to us. We've been trying to shift away from the shrinker anyway but this may speed that up.

[sempervictus]

Seems an unnecessary spoke in the wheel of anyone writing kernel code/drivers. Wonder what the motivation for this is.

@behlendorf: How do you implement a separate memory reclamation scheme anyway?

[behlendorf]

@sempervictus for a filesystem the right way has always been to rely on notifications through the page cache.

[ryao]

Thanks for telling us about this. I have sent an email to the list informing them that we need these. My understanding from what the OpenAFS/Auristor developers have told me is that we need to do that to ensure that we don't lose things we need.

https://lkml.org/lkml/2015/8/31/553

[behlendorf]

Closing. It turns out this wasn't an issue.