gistfile1.txt

evan@bitcoin ~/code/bitcoin (probes) $ readelf -n src/bitcoind

Displaying notes found in: .note.ABI-tag
  Owner                 Data size	Description
  GNU                  0x00000010	NT_GNU_ABI_TAG (ABI version tag)
    OS: Linux, ABI: 3.2.0

Displaying notes found in: .note.gnu.build-id
  Owner                 Data size	Description
  GNU                  0x00000014	NT_GNU_BUILD_ID (unique build ID bitstring)
    Build ID: 8d3bf52cb6cdbeb3fa3fff3c7f2b709363e873c8

Displaying notes found in: .note.stapsdt
  Owner                 Data size	Description
  stapsdt              0x00000037	NT_STAPSDT (SystemTap probe descriptors)
    Provider: bitcoin
    Name: flushcache
    Location: 0x00000000001ac700, Base: 0x00000000003fd3d0, Semaphore: 0x0000000000687078
    Arguments: -8@16(%rsp)

evan@bitcoin ~/code/bitcoin (probes) $ cat cache.stp 
#!/usr/bin/env stap

global bytes_flushed, flush_count

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

probe end {
  printf("total flushes: %d\n", flush_count)
}

evan@bitcoin ~/code/bitcoin (probes) $ stap -c "$PWD/src/bitcoind -reindex-chainstate" cache.stp 
flushed 7293872 bytes
flushed 7319968 bytes
flushed 7438720 bytes
flushed 8320192 bytes
flushed 7293872 bytes
flushed 7297584 bytes
^Cflushed 2856736 bytes
flushed 863200 bytes
total flushes: 8
bytes_flushed=0x2e6dc70