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tracing: Show function names when possible when listing fields

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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: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2025-03-25 17:38:47 -04:00 committed by Steven Rostedt (Google)
parent e3223e1e9a
commit 531ee10b43
1 changed files with 16 additions and 6 deletions
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22
kernel/trace/trace_output.c
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@ -1015,14 +1015,24 @@ static void print_fields(struct trace_iterator *iter, struct trace_event_call *c
break;
}
trace_seq_printf(&iter->seq, "0x%x (%d)",
*(unsigned int *)pos,
*(unsigned int *)pos);
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:
trace_seq_printf(&iter->seq, "0x%llx (%lld)",
*(unsigned long long *)pos,
*(unsigned long long *)pos);
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);
break;
default:
trace_seq_puts(&iter->seq, "<INVALID-SIZE>");