Re: [PATCH 1/4] Add support for userspace stacktraces in tracing/iter_ctrl

Frank Ch. Eigler
2008-10-26T13:16:21Z

"=?ISO-8859-1?Q?Fr=E9d=E9ric_Weisbecker?=" <fweisbec@gmail.com> writes:

> [...]
>> +/* Userspace stacktrace - based on kernel/trace/trace_sysprof.c */
>> +
>> +struct stack_frame {
>> + const void __user *next_fp;
>> + unsigned long return_address;
>> +};
> [...]

To what extent does this actually work, and on which architectures?
While the kernel appears willing to sacrifice some performance for
functionality by building with frame pointers at the drop of a tracing
hat, userspace is not like that.

- FChE