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

[Ingo Molnar]

* Jan Beulich <JBeulich@xxxxxxxxxx> wrote:

> >>> On 30.05.11 at 05:48, Andy Lutomirski <luto@xxxxxxx> 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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