[PATCH 0/2] 2 zone_pages_reclaimable fixes

[Michal Hocko <mhocko@kernel.org>]

Hi,
Johannes had a valid point [1] that zone_pages_reclaimable should contain
isolated pages as well. This is what the first patch does. While I was
there I've realized that the current logic of this function allows for
a large overestimation of the reclaimable memory with anon >> nr_swap_pages
which would be visible especially when the swap is getting short on space.
I think this is a bug and this is fixed in the second patch.

I do not have any particular workload which would show significant misbehavior
because of the current implementation though. We mostly just happen to scan
longer than necessary because zone_reclaimable would keep us looping longer
but I still think it makes sense to fix this regardless.

[1] http://lkml.kernel.org/r/20151123182447.GF13000%40cmpxchg.org

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