linux-kernel - Re: linux-next: clean up the kbuild tree?

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Date:	Fri, 20 Nov 2015 17:00:33 -0800
From:	Andi Kleen <ak@...ux.intel.com>
To:	Michal Marek <mmarek@...e.cz>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: linux-next: clean up the kbuild tree?

Sorry for the delay.

On Mon, Nov 16, 2015 at 02:01:45PM +0100, Michal Marek wrote:
> Dne 15.11.2015 v 18:58 Andi Kleen napsal(a):
> > On Sun, Nov 15, 2015 at 11:27:05AM +1100, Stephen Rothwell wrote:
> >> Hi Michal,
> >>
> >> I notice that the kbuild tree (relative to Linus' tree) only contains
> >> lots of merges and these 2 commits from April 2014:
> > 
> > Really should get in that patch officially. I have a variety of users.
> > And it clearly has been tested long enough in linux-next :)
> > Michal, enough to just repost it?
> 
> So the commit in kbuild.git tree is identical to what is being tested
> out of tree? Could you nevertheless provide an updated changelog? One

Yes. I'll provide a new ChangeLog. 

> (and actually only) of Linus' objections was that it was not clear at
> all what the actual benefits for the kernel itself are. Do you have some
> benchmarks perhaps, where LTO achieves a preformance gain? 

The main users use it to shrink the kernel. I'll run some new benchmarks.

> Also, did the
> compile time impact change with gcc 5.x?

5.x is better than 4.x but it's still a slower. It's also not incremential.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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