linux-kernel - Re: [RFC,v2] x86_64: save

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Message-Id: <49228648.76E4.0078.0@novell.com>
Date:	Tue, 18 Nov 2008 08:09:28 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Alexander van Heukelum" <heukelum@...lshack.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>, "Andi Kleen" <andi@...stfloor.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Glauber Costa" <gcosta@...hat.com>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"Nick Piggin" <nickpiggin@...oo.com.au>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC,v2] x86_64: save_args out of line

>>> Alexander van Heukelum <heukelum@...lshack.com> 17.11.08 18:52 >>>
>The macro "interrupt" in entry_64.S generates a lot of code and it
>is used more and more often. This patch moves most of its contents
>into an external function. This saves anywhere between 500 and 2500
>bytes of text depending on the configuration.

Without numbers, I'd doubt that the code size reduction outweighs the
overhead of the extra call. Did you do any measurements?

>Dwarf2-annotations are most probably wrong or missing at all.

Indeed - do you have intentions to address this?

Jan

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