tree 14d204d0565fd0c61511b5b6f071602d2c97d218
parent cab4d7c6b57d601bf1e875e180a3071c5175f225
author Joel Fernandes <joelaf@google.com> 1519792722 -0800
committer Joel Fernandes <joelaf@google.com> 1519870755 -0800

tools/cachestat: Rewrite it so it makes more sense

cachstat separation between read and writes doesn't make much sense. During tests
its seen that a workload that is supposed to be completely in the missed category
appears to be 50% hit.

This patch rewrites the BCC tool to be more inline with Brendan Gregg's original
cachestat perf tool which makes more sense:
https://github.com/brendangregg/perf-tools/blob/master/fs/cachestat
http://www.brendangregg.com/blog/2014-12-31/linux-page-cache-hit-ratio.html

Fixes Issue: #1586
Signed-off-by: Joel Fernandes <joelaf@google.com>