Date: Thu, 5 Jan 2006 09:30:48 -0500
From: Jakub Jelinek <jakub@redhat.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Martin Bligh <mbligh@mbligh.org>, Chuck Ebbert <76306.1226@compuserve.com>,
       Matt Mackall <mpm@selenic.com>, Adrian Bunk <bunk@stusta.de>,
       Andrew Morton <akpm@osdl.org>, Ingo Molnar <mingo@elte.hu>,
       Linus Torvalds <torvalds@osdl.org>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Dave Jones <davej@redhat.com>,
       Tim Schmielau <tim@physik3.uni-rostock.de>
Subject: Re: [patch 00/2] improve .text size on gcc 4.0 and newer  compilers
Message-ID: <20060105143048.GT22293@devserv.devel.redhat.com>
Reply-To: Jakub Jelinek <jakub@redhat.com>
References: <200601041959_MC3-1-B550-5EE2@compuserve.com> <43BC716A.5080204@mbligh.org> <1136463553.2920.22.camel@laptopd505.fenrus.org>
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On Thu, Jan 05, 2006 at 01:19:12PM +0100, Arjan van de Ven wrote:
> obvious candidates for __rare are
> * pm suspend/resume functions
> * error handling functions
> * initialization stuff (including mount time stuff for filesystems,
>   and hardware setup for drivers)
> 
> I wonder if gcc can be convinced to put all unlikely() code sections
> into a .text.rare as well, that'd be really cool.

gcc 4.1 calls them .text.unlikely and you need to use
-freorder-blocks-and-partition
switch.  But I haven't been able to reproduce it on a short testcase I
cooked up, so maybe it is broken ATM (it put the whole function into
.text rather than the expected part into .text.unlikely and left
empty .text.unlikely).

	Jakub
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