linux-kernel - Re: [GIT] kbuild/lto changes for 3.15-rc1

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Date:	Mon, 7 Apr 2014 13:59:25 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Michal Marek <mmarek@...e.cz>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT] kbuild/lto changes for 3.15-rc1

On Mon, Apr 07, 2014 at 10:19:19PM +0200, Michal Marek wrote:
> Hi Linus,
> 
> besides the kbuild branch, here is the LTO build support by Andi. It is
> a separate branch, because it depends on other patches by Andi which
> were merged through other trees. The link-time-optimization build is an
> experimental feature, so there one kconfig option to enable it and
> another kconfig option to disable it (behind a door with a sign "Beware
> of the Leopard"...), so that it is not enabled by
> allmodconfig/allyesconfig.

Thanks Michal,

I should add this version builds quite a bit slower than other LTO trees,
because the single pass kallsyms didn't quite make it, so the Link
Time Optimization is re-done 2-3 times if KALLSYMS is enabled. That 
will be hopefully fixed next cycle.

LTO will always be somewhat slower than a normal build, but right now 
it's a lot slower because of this, depending on the size of the vmlinux.

-Andi
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