#!/usr/bin/env stap

global bytes_flushed, flush_count, hits, misses, start

probe process("/home/evan/code/bitcoin/src/bitcoind").mark("cache__flush_start") {
  start = gettimeofday_us()
  bytes_flushed += $arg1
  flush_count++
  printf("> flush %d bytes\n", $arg1)
}

probe process("/home/evan/code/bitcoin/src/bitcoind").mark("cache__flush_end") {
  t = gettimeofday_us() - start
  printf("< flush (%d micros)\n", t)
}

probe process("/home/evan/code/bitcoin/src/bitcoind").mark("cache__hit") {
  hits++
}

probe process("/home/evan/code/bitcoin/src/bitcoind").mark("cache__miss") {
  misses++
}

probe timer.sec(10) {
  if (hits || misses)
    printf("hit rate: %d / %d\n", hits, hits + misses)
}

probe begin {
  printf("monitoring for coin flushes...\n")
}

probe end {
  printf("total flushes: %d\n", flush_count)
  printf("total bytes flushed: %d\n", bytes_flushed)
  printf("hit rate: %d / %d\n", hits, misses)
}