linux-kernel - Re: [PATCH 1/4] Add support for userspace stacktraces in tracing/iter

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Message-ID: <y0mbpx71oqp.fsf@ton.toronto.redhat.com>
Date:	Sun, 26 Oct 2008 09:15:42 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	=?ISO-8859-1?Q?Fr=E9d=E9ric_Weisbecker?= <fweisbec@...il.com>
Cc:	=?ISO-8859-1?Q?T=F6r=F6k_Edwin?= 
	<edwintorok@...il.com>, mingo@...e.hu, srostedt@...hat.com,
	a.p.zijlstra@...llo.nl, sandmann@...mi.au.dk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] Add support for userspace stacktraces in tracing/iter_ctrl

"=?ISO-8859-1?Q?Fr=E9d=E9ric_Weisbecker?=" <fweisbec@...il.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
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