From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Thomas Graf <tgraf@suug.ch>,
"David S. Miller" <davem@davemloft.net>,
Bart Van Assche <bvanassche@acm.org>,
Peter Zijlstra <peterz@infradead.org>,
David Rientjes <rientjes@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Oleg Nesterov <oleg@redhat.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] force inlining of spinlock ops
Date: Fri, 15 May 2015 09:20:44 +0200 [thread overview]
Message-ID: <20150515072043.GA4280@osiris> (raw)
In-Reply-To: <55535B0E.6020909@redhat.com>
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.
next prev parent reply other threads:[~2015-05-15 7:20 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-11 17:57 [PATCH] force inlining of spinlock ops Denys Vlasenko
2015-05-11 18:53 ` Josh Triplett
2015-05-11 22:19 ` Andrew Morton
2015-05-12 8:16 ` Hagen Paul Pfeifer
2015-05-12 9:44 ` Denys Vlasenko
2015-05-12 9:48 ` Ingo Molnar
2015-05-12 7:44 ` Ingo Molnar
2015-05-12 11:02 ` Denys Vlasenko
2015-05-12 11:43 ` Ingo Molnar
2015-05-12 13:13 ` Denys Vlasenko
2015-05-13 10:17 ` Ingo Molnar
2015-05-13 10:28 ` Denys Vlasenko
2015-05-13 10:43 ` Ingo Molnar
2015-05-13 14:09 ` Denys Vlasenko
2015-05-15 7:20 ` Heiko Carstens [this message]
-- strict thread matches above, loose matches on Subject: below --
2015-07-13 18:31 Denys Vlasenko
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