Re: [PATCH 2/2] Add a thread cpu time implementation to vDSO

From: Peter Zijlstra
Date: Tue Dec 13 2011 - 13:54:42 EST


On Tue, 2011-12-13 at 10:15 -0800, Arun Sharma wrote:
> On 12/13/11 12:52 AM, Peter Zijlstra wrote:
> > On Mon, 2011-12-12 at 14:14 -0800, Arun Sharma wrote:
> >
> >>> But really most modern distros have NR_CPUS> 64
> >>
> >> Is 256 the new 64? :)
> >
> > 4096 in fact.
>
> Not sure if you're asking for vsyscall support for NR_CPUS=4096 case or
> just a compile fix + disabled vsyscall is ok.

I'm saying distros tend to compile with NR_CPUS=4096, so if you
auto-disable the feature for that, it effectively doesn't exist.
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