什么是Linux上的`ru_maxrss`的单位？ [英] What's the unit of `ru_maxrss` on Linux?

问题描述

这是从男人的getrusage

       struct rusage {
           struct timeval ru_utime; /* user time used */
           struct timeval ru_stime; /* system time used */
           long   ru_maxrss;        /* maximum resident set size */
           long   ru_ixrss;         /* integral shared memory size */
           long   ru_idrss;         /* integral unshared data size */
           long   ru_isrss;         /* integral unshared stack size */
           long   ru_minflt;        /* page reclaims */
           long   ru_majflt;        /* page faults */
           long   ru_nswap;         /* swaps */
           long   ru_inblock;       /* block input operations */
           long   ru_oublock;       /* block output operations */
           long   ru_msgsnd;        /* messages sent */
           long   ru_msgrcv;        /* messages received */
           long   ru_nsignals;      /* signals received */
           long   ru_nvcsw;         /* voluntary context switches */
           long   ru_nivcsw;        /* involuntary context switches */
       };

但它没有指定什么单位。

However it's not specified what's the unit.

我看到了FreeBSD的文档，它说这是在千字节，但我不知道它是在Linux上什么单位。

I saw FreeBSD's documentation which says it's in kilobytes, but I'm not sure about what unit it is on Linux.

推荐答案

这不是一个标准为 rusage 结构字段，以便POSIX并不强求任何事情。但在的Linux

It's not a standard field for the rusage structure so POSIX doesn't mandate anything about it. But on Linux

ru_maxrss （因为Linux 2.6.32）

ru_maxrss (since Linux 2.6.32)

这是使用（以KB为单位）的最大驻留集大小。对于
  RUSAGE_CHILDREN，这是最大的孩子的驻留集大小，
  不是过程树的最大驻留集大小。

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.

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