linux-kernel - Re: [RFC][PATCH] module: Optimize __module

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Date:	Fri, 27 Feb 2015 22:32:39 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <ak@...ux.intel.com>
Cc:	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, mathieu.desnoyers@...icios.com,
	oleg@...hat.com, paulmck@...ux.vnet.ibm.com, mingo@...nel.org
Subject: Re: [RFC][PATCH] module: Optimize __module_address() using a latched RB-tree

Peter Zijlstra <peterz@...radead.org> writes:
> One of the users of this is __kernel_text_address() which is employed in
> many stack unwinders; which in turn are used by perf-callchain (possibly
> from NMI context).

Um, so the stack unwinders use "does this look like a kernel address"
because we omit the frame pointer?

To keep that optimization, we add 220 non-trivial lines to module.c?

Don't get me wrong, it's cute code, but I do wonder if at some point a
grown up is going to come along and tell us to stop :)

Cheers,
Rusty.
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