Se rompe la getrificación en Linux(2.6.30)

linux-kernel getrusage

Question

Este código

 void print_usage(char * msg)
{
struct rusage usage;
getrusage(RUSAGE_SELF, &usage);
printf("Limits: %s/n", msg);
printf(" %s, %li/n", " maximum resident set size " , usage.ru_maxrss );
printf(" %s, %li/n", " integral shared memory size " , usage.ru_ixrss );
printf(" %s, %li/n", " integral unshared data size " , usage.ru_idrss );
printf(" %s, %li/n", " integral unshared stack size " , usage.ru_isrss );
printf(" %s, %li/n", " page reclaims " , usage.ru_minflt );
printf(" %s, %li/n", " page faults " , usage.ru_majflt );
printf(" %s, %li/n", " swaps " , usage.ru_nswap );
printf(" %s, %li/n", " block input operations " , usage.ru_inblock );
printf(" %s, %li/n", " block output operations " , usage.ru_oublock );
printf(" %s, %li/n", " messages sent " , usage.ru_msgsnd );
printf(" %s, %li/n", " messages received " , usage.ru_msgrcv );
printf(" %s, %li/n", " signals received " , usage.ru_nsignals);
printf(" %s, %li/n", " voluntary context switches " , usage.ru_nvcsw );
printf(" %s, %li/n", " involuntary context switches " , usage.ru_nivcsw );
}

informa solo ceros para muchos campos, incluso si lo uso en un programa bastante grande (después de jvm start)

 maximum resident set size , 0
integral shared memory size , 0
integral unshared data size , 0
integral unshared stack size , 0
page reclaims , 2514
page faults , 0
swaps , 0
block input operations , 0
block output operations , 0
messages sent , 0
messages received , 0
signals received , 0
voluntary context switches , 137
involuntary context switches , 1

Los campos distintos de cero son " *vcsw ", " *flt ".

Todas las *signals *rss , *swap , msg* , *block , *signals son cero.

¿Hay algo roto?

Linux es x86 2.6.30.

Answer 1

Sí, está parcialmente roto. No todos los campos están llenos por kernel. http://www.kernel.org/doc/man-pages/online/pages/man2/getrusage.2.html

Campos de trabajo:

 ru_utime
ru_stime
ru_maxrss (since Linux 2.6.32)
ru_minflt
ru_majflt
ru_inblock (since Linux 2.6.22)
ru_oublock (since Linux 2.6.22)
ru_nvcsw (since Linux 2.6)
ru_nivcsw (since Linux 2.6)

Campos no utilizados:

 ru_ixrss (unmaintained)
ru_idrss (unmaintained)
ru_isrss (unmaintained)
ru_nswap (unmaintained)
ru_msgsnd (unmaintained)
ru_msgrcv (unmaintained)
ru_nsignals (unmaintained)