linux-kernel - Re: [RFC 0/2] __vdso

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Message-ID: <539CDC6F.6010501@zytor.com>
Date:	Sat, 14 Jun 2014 16:36:15 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>,
	Rich Felker <dalias@...c.org>
CC:	Russ Cox <rsc@...ang.org>, Linux API <linux-api@...r.kernel.org>,
	Ian Taylor <iant@...ang.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>
Subject: Re: [RFC 0/2] __vdso_findsym

On 06/14/2014 03:38 PM, Andy Lutomirski wrote:
> 
> Hmm.  I hadn't thought of this as a size win, but I guess it could be
> if there are static binaries around.
> 

That pretty much *is* the win, because this is in effect treating the
kernel vdso as a shared library.

> This patch currently generates 488 bytes on text with my toolchain.
> More than half of that is garbage needed to deal with the symbol
> version tables, and I should be able to move a decent fraction of it
> to vdso2c and therefore out of the kernel and vdso images.

Now, if we can do this without adding another page then that becomes
much more compelling IMO.  I suspect we can if you are already down to
488 bytes.

	-hpa


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