linux-kernel - Re: powerpc allyesconfig / allmodconfig linux-next next-20160729

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Date:	Wed, 03 Aug 2016 22:13:28 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	Segher Boessenkool <segher@...nel.crashing.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Nicholas Piggin <npiggin@...il.com>,
	"Luis R. Rodriguez" <mcgrof@...nel.org>,
	linux-next@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures

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@...Ghz, 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