tools/cachestat: fix python 3 str/bytes type error (iovisor#2287)

TypeError: argument should be integer or bytes-like object, not 'str'

Signed-off-by: Adrian Ratiu <[email protected]>

tools/cachestat.py

@@ -124,13 +124,13 @@ def get_meminfo():
  for k, v in sorted(counts.items(), key=lambda counts: counts[1].value):
  func = b.ksym(k.ip)
  # partial string matches in case of .isra (necessary?)
- if func.find("mark_page_accessed") == 0:
+ if func.find(b"mark_page_accessed") == 0:
  mpa = max(0, v.value)
- if func.find("mark_buffer_dirty") == 0:
+ if func.find(b"mark_buffer_dirty") == 0:
  mbd = max(0, v.value)
- if func.find("add_to_page_cache_lru") == 0:
+ if func.find(b"add_to_page_cache_lru") == 0:
  apcl = max(0, v.value)
- if func.find("account_page_dirtied") == 0:
+ if func.find(b"account_page_dirtied") == 0:
  apd = max(0, v.value)
 
  # total = total cache accesses without counting dirties