Re: [PATCH] Performance Stats: Kernel patch

[Maxim Uvarov]

Andi Kleen wrote:

> Maxim Uvarov <muvarov@xxxxxxxxxxxxx> writes:
>  
>
> > This data is useful for detecting hyperactivity
> > patterns between processes.
> >    
>
> You need a lot better rationale to slow down these important
> fast paths. Particularly the syscall path is very hot.
>
> Is this something that is really generally useful? The context
> switch counters might be occasionally useful, but strace can
> you just give the syscall count anyways. Still not sure 
> it really should go into the standard kernel. Perhaps just keep it 
> as a systemtap script?
>
> -Andi
>  
It is difficult to use strace for multi thread applications to
verify which thread is doing what.
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