linux-kernel - Re: [PATCH v2 08/10] x86-64: Emulate vsyscalls

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Message-ID: <20110530080712.GH27557@elte.hu>
Date:	Mon, 30 May 2011 10:07:12 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jan Beulich <JBeulich@...ell.com>
Cc:	Andy Lutomirski <luto@....EDU>, Borislav Petkov <bp@...en8.de>,
	Jesper Juhl <jj@...osbits.net>,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Mikael Pettersson <mikpe@...uu.se>, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 08/10] x86-64: Emulate vsyscalls


* Jan Beulich <JBeulich@...ell.com> wrote:

> >>> On 30.05.11 at 05:48, Andy Lutomirski <luto@....EDU> wrote:
> > This causes vsyscalls to be a little more expensive than real
> > syscalls.  Fortunately sensible programs don't use them.
> 
> Hmm - weren't vsyscalls there for performance reasons?

New code uses the vDSO. The fixed-address vsyscalls are apparently 
only used in esoteric cases like statically linked glibc binaries. 
(which should arguably be using the vDSO as well)

Thanks,

	Ingo
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