I suggest assigning values bufferusage.shared_blks_read + bufferusage.local_blks_read and bufferusage.shared_blks_dirtied + bufferusage.local_blks_dirtied to new variables and using them. This would keep the changed lines within
the 80 symbols limit, and make the code more readable overall.
The same applies to bufferusage.shared_blks_hit + bufferusage.local_blks_hit