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SubjectRe: /proc 2.6.24 changes for guest CPU accounting
On Mon, Jun 23, 2008 at 12:51:11PM +0200, Michael Kerrisk wrote:
> > You must also notes that "user time" includes "guest time", if you want
> > real "user time" you must subtract "guest time".
> > The "guest time" is included in "user time" to not loose it when the
> > "reader" is not aware of the "guest time".
> Hi Laurent (and Christian)
> So, I just want to confirm. You are saying that guest_time and
> cguest_time are respectively also included in the following fields
> utime %lu
> cutime %ld
> Right?

If this function in ./kernel/sched.c is anything to go by and I'm not
being a complete noob, yes:

* Account guest cpu time to a process.
* @p: the process that the cpu time gets accounted to
* @cputime: the cpu time spent in virtual machine since the last update
static void account_guest_time(struct task_struct *p, cputime_t cputime)
cputime64_t tmp;
struct cpu_usage_stat *cpustat = &kstat_this_cpu.cpustat;

tmp = cputime_to_cputime64(cputime);

p->utime = cputime_add(p->utime, cputime);
p->gtime = cputime_add(p->gtime, cputime);

cpustat->user = cputime64_add(cpustat->user, tmp);
cpustat->guest = cputime64_add(cpustat->guest, tmp);

As such, I'll follow up with a new version of my previous patch.


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