linux-kernel - Re: [PATCHv4 2/3] fs: Make core dump functionality optional

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Message-ID: <20120810150157.GA23457@leaf>
Date:	Fri, 10 Aug 2012 08:01:57 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Serge Hallyn <serge.hallyn@...onical.com>
Cc:	Alex Kelly <alex.page.kelly@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 2/3] fs: Make core dump functionality optional

On Fri, Aug 10, 2012 at 08:23:23AM -0500, Serge Hallyn wrote:
> Quoting Alex Kelly (alex.page.kelly@...il.com):
> > Adds an expert Kconfig option, CONFIG_COREDUMP, which allows disabling of core dump.
> > This saves approximately 2.6k in the compiled kernel, and complements CONFIG_ELF_CORE,
> > which now depends on it.
> 
> Is there another reason than the 2.6k to do this?  My kernels range
> between 4.8 and 5M, so that's .05% size savings?

A kitchen-sink kernel might take up that much space, but you can build a
minimal embedded kernel that only takes up ~200k, at which point 2.6k
represents a >1% decrease.  Add a few more changes like this, and those
decreases start to add up.  At this point, no one thing you can chop out
of the kernel will give you a 100k decrease by itself; you need a pile
of changes like this one to do that.

- Josh Triplett
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