Re: [patch] dubious process system time.

[Andi Kleen <ak@suse.de>]

Martin Schwidefsky <schwidefsky@de.ibm.com> writes:

> From: Martin Schwidefsky <schwidefsky@de.ibm.com>
> 
> [patch] dubious process system time.
> 
> The system time that is accounted to a process includes the time spent
> in three different contexts: normal system time, hardirq time and
> softirq time. To account hardirq time and sortirq time to a process
> seems wrong, because the process could just happen to run when the
> interrupt arrives that was caused by an i/o for a completly different
> process. And the sum over stime and cstime of all processes won't
> match cputstat->system either. 
> The following patch changes the accounting of system time so that
> hardirq and softirq time are not accounted to a process anymore.

So where does it get accounted then? It has to be accounted somewhere.
Sounds like a quite radical change to me, might break a lot of 
existing assumptions.

-Andi