Re: [PATCH] x86: Export tsc related information in sysfs

From: Peter Zijlstra
Date: Tue May 18 2010 - 07:59:28 EST

On Tue, 2010-05-18 at 13:25 +0200, Andi Kleen wrote:
> On Tue, May 18, 2010 at 11:58:18AM +0200, Peter Zijlstra wrote:
> > On Sun, 2010-05-16 at 22:06 -0700, Arjan van de Ven wrote:
> > > look we're not disabling ring 3 tsc. We could, but we don't.
> >
> > Maybe we should.
> That would kill the vsyscall too. Remember it's running in ring 3.
> That is in theory you could disable it on systems where the vsyscall
> doesn't use it, but then you would likely break huge amounts of software,
> unless you emulate it.

Well, software shouldn't use it, so breaking it sounds like a fine
idea ;-)

Also, a slow emulation is an incentive to actually do the right thing.
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