Re: [PATCH 1/7] cpu-timers: high-resolution CPU clocks for POSIX clock_* syscalls

[Andi Kleen]

On Tue, Dec 14, 2004 at 02:44:17PM -0800, Ulrich Drepper wrote:
> On 14 Dec 2004 20:07:39 +0100, Andi Kleen <ak@xxxxxxx> wrote:
> 
> > I don't think this should be merged until a clear need from a useful
> > application is demonstrated for it.
> 
> This is something which is requested countless times.  Everybody doing
> development of sophisticated programs adds some kind of self
> monitoring.  And there is of course profiling.  The most widely used

You mean statistical profiling? I don't see why you need a bigger
resolution than HZ for that. 

> program which needs this is probably the JVM.  Don't ask me for the
> specific class, but the JVM developers asked for these clocks in this
> form.  Without the support available the Linux JVM is never going to

They didn't ask linux-kernel at least. Perhaps their requirements
should be discussed here first before messing up all kinds of
fast paths with dubious changes? 

-Andi
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