Commit 531ee10b authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt (Google)
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tracing: Show function names when possible when listing fields 

When the "fields" option is enabled, the "print fmt" of the trace event is
ignored and only the fields are printed. But some fields contain function
pointers. Instead of just showing the hex value in this case, show the
function name when possible:

Instead of having:

 # echo 1 > options/fields
 # cat trace
 [..]
  kmem_cache_free: call_site=0xffffffffa9afcf31 (-1448095951) ptr=0xffff888124452910 (-131386736039664) name=kmemleak_object

Have it output:

  kmem_cache_free: call_site=rcu_do_batch+0x3d1/0x14a0 (-1768960207) ptr=0xffff888132ea5ed0 (854220496) name=kmemleak_object

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/20250325213919.624181915@goodmis.org


Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent e3223e1e

kernel/trace/trace_output.c

+16 −6
Original line number Diff line number Diff line
@@ -1015,11 +1015,21 @@ static void print_fields(struct trace_iterator *iter, struct trace_event_call *c 
					break;

				}



				if (sizeof(long) == 4)

					trace_seq_printf(&iter->seq, "%pS (%d)",

							 *(void **)pos,

							 *(unsigned int *)pos);

				else

					trace_seq_printf(&iter->seq, "0x%x (%d)",

							 *(unsigned int *)pos,

							 *(unsigned int *)pos);

				break;

			case 8:

				if (sizeof(long) == 8)

					trace_seq_printf(&iter->seq, "%pS (%lld)",

							 *(void **)pos,

							 *(unsigned long long *)pos);

				else

					trace_seq_printf(&iter->seq, "0x%llx (%lld)",

							 *(unsigned long long *)pos,

							 *(unsigned long long *)pos);