Messages in this thread | | | Date | Mon, 30 May 2011 10:07:12 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH v2 08/10] x86-64: Emulate vsyscalls |
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* Jan Beulich <JBeulich@novell.com> wrote:
> >>> On 30.05.11 at 05:48, Andy Lutomirski <luto@MIT.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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