Usage: cassandra_pagecache_usage [options] <cassandra-data-directory>

Options:
  -h, --help            show this help message and exit
  -c, --columnfamily-summarize
                        Summarize cached Cassandra data on a per Column Family
                        basis.
  --exclude-filter      Exclude statistics for Cassandra Filter files.
  --exclude-index       Exclude statistics for Cassandra Index files.
  --exclude-data        Exclude statistics for Cassandra Data files.

This tool might be useful for debugging Cassandra's usage of Linux page cache.

This tool depends on python-ftools's fincore_ratio (which implements the
mincore system call via python C extension): http://github.com/david415/python-ftools

Enjoy!