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

On Sun, 2008-10-26 at 09:15 -0400, Frank Ch. Eigler wrote:
"=?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.

Aww, common, Gentoo is brilliant for that :-)

CFLAGS+=-fframe-pointer

emerge -uDNe world

Then again, you'd better not have all that desktop bloat installed,
otherwise that will take ages.. KDE/OOo compile times anyone?

/me runs

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