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From: Andi Kleen <ak@linux.intel.com>
To: Michal Marek <mmarek@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [GIT] kbuild/lto changes for 3.15-rc1
Date: Mon, 7 Apr 2014 13:59:25 -0700	[thread overview]
Message-ID: <20140407205925.GX32556@tassilo.jf.intel.com> (raw)
In-Reply-To: <20140407201919.GA15838@sepie.suse.cz>

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

  reply	other threads:[~2014-04-07 23:16 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-07 20:19 [GIT] kbuild/lto changes for 3.15-rc1 Michal Marek
2014-04-07 20:59 ` Andi Kleen [this message]
2014-04-08 15:26 ` Linus Torvalds
2014-04-08 20:49   ` josh
2014-04-08 22:44     ` Linus Torvalds
2014-04-09  1:35       ` Andi Kleen
2014-04-09  6:01         ` Ingo Molnar
2014-04-09  8:17           ` Markus Trippelsdorf
2014-04-14 10:32             ` Ingo Molnar
2014-04-14 10:46               ` Markus Trippelsdorf
2014-04-14 10:55                 ` Ingo Molnar
2014-04-15  1:00               ` Josh Triplett
2014-04-15  1:52                 ` Andi Kleen
2014-04-15  6:00                 ` Ingo Molnar
2014-04-15  9:36                 ` Ralf Baechle
2014-04-15 11:19                   ` Sam Ravnborg
2014-04-15 11:36                     ` Markus Trippelsdorf
2014-04-15 18:19                       ` Sam Ravnborg
2014-04-15 18:29                         ` Markus Trippelsdorf
2014-04-16  6:49                           ` Ingo Molnar
2014-04-09 15:40           ` Andi Kleen
2014-04-08 22:49   ` Andi Kleen
2014-04-09  0:10     ` Jan Hubicka
2014-04-09  1:23       ` Andi Kleen
2014-04-09  0:14     ` Tim Bird

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