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

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Message-ID: <CALCETrU0U80xG+zY-BhWr1EG0Us4rFC6DAkqGHaYzbpxrBTbMQ@mail.gmail.com>
Date:	Fri, 7 Aug 2015 11:13:48 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Nathan Lynch <Nathan_Lynch@...tor.com>
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 Fri, Aug 7, 2015 at 9:10 AM, Nathan Lynch <Nathan_Lynch@...tor.com> wrote:
> 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.
>
>

At least on my configuration, that doesn't push it across a page
boundary, so it doesn't really matter.

--Andy
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