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Message-ID: <20140407205925.GX32556@tassilo.jf.intel.com> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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