这段代码
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 );
}
许多字段只报告零，即使我在相当大的程序中使用它（在 jvm 启动之后）
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
非零字段是“ *vcsw”、“ *flt”。
所有*rss, *swap, msg*, *block,*signals都是零。
有什么东西坏了吗？
Linux 是 x86 2.6.30。