linux-kernel - Re: [PATCH] x86/vdso: Emit a GNU hash

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Message-ID: <55C4D87A.2030101@mentor.com>
Date:	Fri, 7 Aug 2015 11:10:34 -0500
From:	Nathan Lynch <Nathan_Lynch@...tor.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Andy Lutomirski <luto@...nel.org>,
	Anton Blanchard <anton@...ba.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Richard Kuo <rkuo@...eaurora.org>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Isaac Dunham <ibid.ag@...il.com>,
	Rich Felker <dalias@...c.org>,
	"musl@...ts.openwall.com" <musl@...ts.openwall.com>
Subject: Re: [PATCH] x86/vdso: Emit a GNU hash

On 08/06/2015 05:52 PM, Andy Lutomirski wrote:
> [adding lots of cc's]
> 
> On Thu, Aug 6, 2015 at 2:45 PM, Andy Lutomirski <luto@...nel.org> wrote:
>> From: Andy Lutomirski <luto@...capital.net>
>>
>> Some dynamic loaders may be slightly faster if a GNU hash is
>> available.  Strangely, this seems to have no effect at all on the
>> vdso size.

FWIW, I see arch/x86/entry/vdso/vdso64.so increase by 168 bytes here,
using GCC 4.9.2, Binutils 2.24 as packaged by Fedora 21.

I see a similar increase when I make the equivalent change for ARM.


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