Re: [PATCH] Performance Stats: Kernel patch

[Maxim Uvarov <muvarov@ru.mvista.com>]

Andi Kleen wrote:

>Maxim Uvarov <muvarov@ru.mvista.com> 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.