Re: Performance Stats: Kernel patch

[Bill Davidsen]

Eric Dumazet wrote:
> On Wed, 11 Apr 2007 15:59:16 +0400
> Maxim Uvarov <muvarov@xxxxxxxxxxxxx> wrote:
>
>   
> > Patch adds Process Performance Statistics.
> > It make available to the user the following 
> > new per-process (thread) performance statistics:
> >    * Involuntary Context Switches
> >    * Voluntary Context Switches
> >    * Number of system calls
> >    
> > This data is useful for detecting hyperactivity 
> > patterns between processes.
> >     
>
> Your description is not very clear about the semantic of your stats.
>
> You currently returns stats only for thread(s) (not process as you claimed)
>   
I'm not sure if you were confused by his use of thread in parenthesis, 
but isn't the whole point of this to see which threads are doing what? 
Or am I misreading his result as intentional?
> Please check kernel/sys.c:k_getrusage() to see how getrusage() has to sum *lot* of individual fields to get precise process numbers (even counting stats for dead threads)
>
>   
--
bill davidsen <davidsen@xxxxxxx>
 CTO TMR Associates, Inc
 Doing interesting things with small computers since 1979

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