Re: [patch 0/9] x86_64: reliable TSC-based gettimeofday

[Andi Kleen]

On Thursday 01 February 2007 12:53, Andrea Arcangeli wrote:
> On Thu, Feb 01, 2007 at 12:20:59PM +0100, Andi Kleen wrote:
> > I think a better way to do this would be to define a new CLOCK_THREAD_MONOTONOUS
> > (or better name) timer for clock_gettime(). 
> > 
> > [and my currently stalled vdso patches that implement clock_gettime
> > as a vsyscall]
> > 
> > Then also an application could easily use it with LD_PRELOAD
> 
> I think a prctl to enable the non monothone mode is better than any
> LD_PRELOAD trick.

I don't think so because having per process state in a vsyscall
is quite costly. You would need to allocate at least one more
page to each process, which I think would be excessive.

-Andi
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