Re: [ANNOUNCE] ktimers subsystem

[Christoph Lameter]

On Tue, 20 Sep 2005, Thomas Gleixner wrote:

> Hmm. I don't understand the argument line completely. 
> 
> 1. The kernel has to provide ugly mechanisms because a lot of
> applications implementations are doing the Wrong Thing ?

Lets skip the "wrong thing"... Or are you saying that glibc and all the 
apps are all wrong? 

Applications call gettimeofday for a variety of reasons. One is because it 
is widely available over different platformsn and application want to 
schedule things, need timestamps etc etc.

> > Many platforms can execute gettimeofday 
> > without having to enter the kernel.
> 
> Which ones ? How is this achieved with respect to all the time adjust,
> correction... code ?

IA64 f.e. has a special instruction that allows access to kernel user 
space without having to do a context switch.

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