From: Sam Ravnborg <sam@ravnborg.org>
To: Igor Bukanov <igor@mir2.org>
Cc: gcc-help@gcc.gnu.org
Subject: Re: Aligning function on a page boundary
Date: Wed, 27 Feb 2008 14:00:00 -0000 [thread overview]
Message-ID: <20080227130900.GA8976@uranus.ravnborg.org> (raw)
In-Reply-To: <7dee4710802270451t5c6359deo2dacd0c5f4a60308@mail.gmail.com>
On Wed, Feb 27, 2008 at 01:51:10PM +0100, Igor Bukanov wrote:
> Hi,
>
> is it possible with GCC 4.1 to align one single function on a CPU page
> boundary for ELF targets? This is very desired since the function in
> question is an interpreter loop . It has 50K of code and is executed
> very often. Aligning it on the page boundary should reduce TLB misses.
>
> It seems the forthcoming GCC 4.3 allows that as it supports the align
> attribute for functions, but it would be nice to do that with GCC
> 4.1.
One way is to use the section attribute to tell gcc to put the
function in a specific section and then in the linker script
page align said section.
This is used extensively in the linux kernel.
Sam
next prev parent reply other threads:[~2008-02-27 13:09 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-27 13:09 Igor Bukanov
2008-02-27 14:00 ` Sam Ravnborg [this message]
2008-02-27 14:08 ` Igor Bukanov
2008-02-27 17:43 ` Sam Ravnborg
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