percpu: use metadata blocks to update the chunk contig hint
The largest free region will either be a block level contig hint or an aggregate over the left_free and right_free areas of blocks. This is a much smaller set of free areas that need to be checked than a full traverse. Signed-off-by: NDennis Zhou <dennisszhou@gmail.com> Reviewed-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NTejun Heo <tj@kernel.org>
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