On Friday 16 March 2007 18:10, Oleg Nesterov wrote:
> Eric Dumazet wrote:
> > @@ -2021,6 +2022,8 @@ static void k_getrusage(struct task_stru
> > r->ru_nivcsw = p->signal->cnivcsw;
> > r->ru_minflt = p->signal->cmin_flt;
> > r->ru_majflt = p->signal->cmaj_flt;
> > + r->ru_inblock = task_io_get_inblock(p);
> > + r->ru_oublock = task_io_get_oublock(p);
> >
> > if (who == RUSAGE_CHILDREN)
> > break;
> > @@ -2032,6 +2035,8 @@ static void k_getrusage(struct task_stru
> > r->ru_nivcsw += p->signal->nivcsw;
> > r->ru_minflt += p->signal->min_flt;
> > r->ru_majflt += p->signal->maj_flt;
> > + r->ru_inblock += task_io_get_inblock(p);
> > + r->ru_oublock += task_io_get_oublock(p);
> > t = p;
> > do {
> > utime = cputime_add(utime, t->utime);
> > @@ -2040,6 +2045,8 @@ static void k_getrusage(struct task_stru
> > r->ru_nivcsw += t->nivcsw;
> > r->ru_minflt += t->min_flt;
> > r->ru_majflt += t->maj_flt;
> > + r->ru_inblock += task_io_get_inblock(t);
> > + r->ru_oublock += task_io_get_oublock(t);
>
> I can't understand this. Consider k_getrusage(RUSAGE_BOTH). The end result
> is that r->ru_inblock == 3 * task_io_get_inblock(p).
>
> No?
Yes :)
Very good point, you found a bug in k_getrusage().
I just followed the existing logic, but it seems this logic is bad.
So not only ru_inblock/ru_oublock are multiplied by 3 : others fields as well
are wrong.
Also the definition of RUSAGE_CHILDREN is not conformant to standard
http://www.opengroup.org/onlinepubs/009695399/functions/getrusage.html
"If the value of the who argument is RUSAGE_CHILDREN, information shall
be
"returned about resources used by the terminated and waited-for
children of
"the current process
We currently do a sum of rusage stats of still alive children.. thats totally
wrong...
Eric
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