rusage成员说明——获取进程资源使用情况

 

       ru_utime

              This is the total amount of time spent executing in user mode,

              expressed in a timeval structure (seconds plus microseconds).

       ru_stime

              This is the total amount of time spent executing in kernel mode,

              expressed in a timeval structure (seconds plus microseconds).

       ru_maxrss (since Linux 2.6.32)

              This is the maximum resident set size used (in kilobytes). For

              RUSAGE_CHILDREN, this is the resident set size of the largest child,

              not the maximum resident set size of the process tree.

       ru_ixrss (unmaintained)

              This field is currently unused on Linux.

       ru_idrss (unmaintained)

              This field is currently unused on Linux.

       ru_isrss (unmaintained)

              This field is currently unused on Linux.

       ru_minflt

              The number of page faults serviced without any I/O activity; here I/O

              activity is avoided by "reclaiming" a page frame from the list of pages

              awaiting reallocation.

       ru_majflt

              The number of page faults serviced that required I/O activity.

       ru_nswap (unmaintained)

              This field is currently unused on Linux.

       ru_inblock (since Linux 2.6.22)

              The number of times the file system had to perform input.

       ru_oublock (since Linux 2.6.22)

              The number of times the file system had to perform output.

       ru_msgsnd (unmaintained)

              This field is currently unused on Linux.

       ru_msgrcv (unmaintained)

              This field is currently unused on Linux.

       ru_nsignals (unmaintained)

              This field is currently unused on Linux.

       ru_nvcsw (since Linux 2.6)

              The number of times a context switch resulted due to a process

              voluntarily giving up the processor before its time slice was completed

              (usually to await availability of a resource).

       ru_nivcsw (since Linux 2.6)

              The number of times a context switch resulted due to a higher priority

              process becoming runnable or because the current process exceeded its

              time slice.