是的，它被部分破坏了。并非所有字段都由内核填充。http://www.kernel.org/doc/man-
pages/online/pages/man2/getrusage.2.html
工作领域：
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)
未使用的字段：
ru_ixrss (unmaintained) ru_idrss (unmaintained) ru_isrss (unmaintained) ru_nswap (unmaintained) ru_msgsnd (unmaintained) ru_msgrcv (unmaintained) ru_nsignals (unmaintained)
