From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S932765AbcHCUOx (ORCPT <rfc822;w@1wt.eu>);
	Wed, 3 Aug 2016 16:14:53 -0400
Received: from mout.kundenserver.de ([212.227.126.131]:58469 "EHLO
	mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S932687AbcHCUOr (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Wed, 3 Aug 2016 16:14:47 -0400
From: Arnd Bergmann <arnd@arndb.de>
To: linuxppc-dev@lists.ozlabs.org
Cc: Segher Boessenkool <segher@kernel.crashing.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Nicholas Piggin <npiggin@gmail.com>,
        "Luis R. Rodriguez" <mcgrof@kernel.org>, linux-next@vger.kernel.org,
        Paul Mackerras <paulus@samba.org>,
        Fengguang Wu <fengguang.wu@intel.com>,
        Guenter Roeck <linux@roeck-us.net>
Subject: Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures
Date: Wed, 03 Aug 2016 22:13:28 +0200
Message-ID: <6481373.xtk4H4bKaE@wuerfel>
User-Agent: KMail/5.1.3 (Linux/4.4.0-31-generic; KDE/5.18.0; x86_64; ; )
In-Reply-To: <20160803194429.GA14627@gate.crashing.org>
References: <CAB=NE6U18jv89pxqAeZY8eTj44mq90kyXGaQO-108+ZMTyxQiQ@mail.gmail.com> <3892328.nUGXIq3MaH@wuerfel> <20160803194429.GA14627@gate.crashing.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 7Bit
Content-Type: text/plain; charset="us-ascii"
X-Provags-ID: V03:K0:ucqROwEyYRYjvxFvcBLEpjSVSRz1750czNRqDNF6yeWK+cB8Tqi
 O+NGC/liVN05AZuuSEXCB77rjIGsMDp2dQEUQuqR5oxTkKCt2Qjf8FjwdnRP+9gBDFJ60ob
 8u9P0d2AJUJYdkeRx103G56jm8i1lcM1mkaxSZX/H70vVsjwDDFys+KUChuTYQeKs24Ocfw
 1i8/c59QFyeKY+AdE68Cg==
X-UI-Out-Filterresults: notjunk:1;V01:K0:EhR9ieWqT7c=:DDvf4L+PAvOMQup/Ts/6S3
 sS/IqnbtZ5/FvpyUfL7Ze/fmAYp+zjZ1l5YxCuSwxqlH5OqcJA2mlAP6uLfKK+6qJVuvIFK4i
 fAbINksj1WG2i4zg1o68IU93rWtzmTR3ROYYuATFsqbsBKh5im3SImp9/ithm5DTxfNo8oS8y
 SlZ9qKl+pqr0HjPWMqF0QKEikRSojSYp835IGlYnEw809Sa4NaGXfvUWksetRt6Av6/cIJzbF
 wYMmrbXRwrDSogNr5pbXm13n3IbfYZ41RyYuG6N/HFdylSYOI4ZH/tE3d+7SWA2uFnMFkQWHg
 ZAscHHXVgKPLv5b6ZotqK1ljUv4TaRK1h5+fQ1crFQNV1kFksCexIf0YtH3IrAVbvahatlRrp
 wbneu+vUigX0dX0+qWVHKl5kJ8MbCBeyRcHjU6dkgWiyEB4JuwsUuD0D3xyFBiryFoumAbf95
 daJwm3oQuF0eOJMRkwD16K4pclNdls2m6NMTIrosuZuphntMP5Q26w24BKf+FQ5H6Cb+Hq/an
 6KwOiBGOty45zp9V6eFleMLTe1gcC9AQ7ma+C0bOSPUqxFU5ULW8MmXx4tMwqFNtlEawN3j+k
 0B4jla0CBz5mDbj6m84wj1M6/iGWSXntZULo1VBptEhE3zBhsEcohY8FIuoKnHrvu9azFym6n
 MKZ5i+n5h7+UcQru4K+m8JDitBX9eVCR8441hRfQw0S5AbTql4psSMYuPS7QGUCl2J4reMuO5
 ty1gbgAE41/ZZIrf
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Wednesday, August 3, 2016 2:44:29 PM CEST Segher Boessenkool wrote:
> Hi Arnd,
> 
> On Wed, Aug 03, 2016 at 08:52:48PM +0200, Arnd Bergmann wrote:
> > From my first look, it seems that all of lib/*.o is now getting linked
> > into vmlinux, while we traditionally leave out everything from lib/
> > that is not referenced.
> > 
> > I also see a noticeable overhead in link time, the numbers are for
> > a cache-hot rebuild after a successful allyesconfig build, using a
> > 24-way Opteron@2.5Ghz, just relinking vmlinux:
> > 
> > $ time make skj30 vmlinux # before
> > real	2m8.092s
> > user	3m41.008s
> > sys	0m48.172s
> > 
> > $ time make skj30 vmlinux # after
> > real	4m10.189s
> > user	5m43.804s
> > sys	0m52.988s
> 
> Is it better when using rcT instead of rcsT?

It seems to be noticeably better for the clean rebuild case, though
not as good as the original:

real	3m34.015s
user	5m7.104s
sys	0m49.172s

I've also tried now with my own patch applied as well (linking
each drivers/*/built-in.o into vmlinux rather than having them
linked into drivers/built-in.o first), but that makes no
difference.

	Arnd