Unable to get the function offset of sched_blocked_reason using Perfetto

[quenpsi]

Hello, when I use Pertetto to capture the trace, the caller of sched_blocked_reason is just a function name without offset. Like this:

But it can be displayed normally when I grab ftrace alone. Do you know how to solve it?

echo 1 >/sys/kernel/tracing/events/sched/sched_blocked_reason/enable

echo 1 > /sys/kernel/tracing/tracing_on

cat /sys/kernel/tracing/trace

[LalitMaganti]

Theres no solution for this as sched_blocked_reason is implemented today. We don't use the text interface of ftrace but the binary interface which gives us the full function address. To avoid leaking kaslr, we turn this into a symbol name on device at which point the offset is lost

Frankly this is the first time anyone has asked about this in 7 years of Perfetto so it's unlikely we would do anything about this, especially because it requires changes across the whole stack.

Patches for this welcome but we will not be getting to this any time soon (and I don't think we consider this a high priority).