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

[Frank Ch. Eigler]

"=?ISO-8859-1?Q?Fr=E9d=E9ric_Weisbecker?=" <fweisbec@xxxxxxxxx> 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
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