linux-kernel - Re: [PATCH] force inlining of spinlock ops

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Message-ID: <20150515072043.GA4280@osiris>
Date:	Fri, 15 May 2015 09:20:44 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Graf <tgraf@...g.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Bart Van Assche <bvanassche@....org>,
	Peter Zijlstra <peterz@...radead.org>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] force inlining of spinlock ops

On Wed, May 13, 2015 at 04:09:18PM +0200, Denys Vlasenko wrote:
> On 05/13/2015 12:43 PM, Ingo Molnar wrote:
> > We only know that the net effect is +70 bytes. Does that come out of:
> > 
> >  - large fluctuations such as -1000-1000+1000+1070, which happens to 
> >    net out into a small net number?
> > 
> >  - or does it come from much smaller fluctuations?
> > 
> > So to make an informed decision we need to know those details.
> 
> Fair enough. Let's investigate.
> 
> I produced a list of functions with their sizes from each vmlinux,
> and diffed them:
> 
> $ nm --size-sort vmlinux | sed 's/\.[0-9]*.*/.NNN/' >vmlinux.nm
> $ nm --size-sort vmlinuxO2.before | sed 's/\.[0-9]*.*/.NNN/' >vmlinuxO2.before.nm
> $ diff -u vmlinuxO2.before.nm vmlinux.nm | grep -v '^[ @]' >vmlinux.nm.dif

FWIW, scripts/bloat-o-meter is a nice tool to examine the size differences
of two vmlinux images.

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