lock: display info (symbol, slab cache, etc) for locks

It's useful to know if a lock belongs to a variable, or a slab object, or something else. The identify_address() function does this for us. Use it to format the lock information. Signed-off-by: Stephen Brennan <[email protected]>
oracle-samples · Oct 1, 2024 · d0b8197 · d0b8197
1 parent b1d0c10
commit d0b8197
Showing 1 changed file with 15 additions and 3 deletions.
diff --git a/drgn_tools/lock.py b/drgn_tools/lock.py
@@ -35,6 +35,7 @@
 from drgn import Object
 from drgn import Program
 from drgn import StackFrame
+from drgn.helpers.common import identify_address
 from drgn.helpers.linux.cpumask import for_each_present_cpu
 from drgn.helpers.linux.percpu import per_cpu
 from drgn.helpers.linux.pid import find_task
@@ -110,6 +111,14 @@ def scan_osq_node(prog: Program, verbosity: int = 0) -> None:
  bt(prog, cpu=cpu)
 
 
+def _addr_info(prog: Program, addr: int):
+ info = identify_address(prog, addr)
+ if info:
+ return f" ({info})"
+ else:
+ return ""
+
+
 def scan_mutex_lock(
  prog: Program,
  stack: bool,
@@ -147,7 +156,8 @@ def scan_mutex_lock(
 
  struct_owner = mutex_owner(prog, mutex)
  index = 0
- print(f"Mutex: 0x{mutex_addr:x}")
+ addr_info = _addr_info(prog, mutex_addr)
+ print(f"Mutex: 0x{mutex_addr:x}{addr_info}")
  if struct_owner:
  print(
  "Mutex OWNER:",
@@ -207,7 +217,8 @@ def show_sem_lock(
  seen_sems.add(semaddr)
 
  index = 0
- print(f"Semaphore: 0x{semaddr:x}")
+ addr_info = _addr_info(prog, semaddr)
+ print(f"Semaphore: 0x{semaddr:x}{addr_info}")
  print(
  "Semaphore WAITERS (Index, cpu, comm, pid, state, wait time (d hr:min:sec:ms)):"
  )
@@ -254,7 +265,8 @@ def show_rwsem_lock(
  seen_rwsems.add(rwsemaddr)
 
  index = 0
- print(f"Rwsem: ({rwsem.type_.type_name()})0x{rwsem.value_():x}")
+ addr_info = _addr_info(prog, rwsem.value_())
+ print(f"Rwsem: 0x{rwsem.value_():x}{addr_info}")
  if rwsem_has_spinner(rwsem):
  get_rwsem_spinners_info(rwsem, stack)
  else: