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procinfo.h under AIX

griessh
griessh asked
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Last Modified: 2013-12-26
The structs procinfo{} and userinfo{} in /usr/include/procinfo.h are containers for quite a bit of information about the processes running on your system. One of my favourite apps, 'monitor' uses them, but I still have problems interpreting all of the elements:


struct      userinfo
{
        .
        .
        .
      unsigned long      ui_tsize;      /* size of text */
        .
        .
        .
      /* memory usage info */
      unsigned long      ui_drss;      /* data resident set size */
      unsigned long      ui_trss;      /* text resident set size */
      unsigned long      ui_dvm;            /* data virtual memory size */
};

are dealing with memory sizes, but what sizes are these exactly? What is considered to be 'text', 'data'? Please no guesses, please no easy explanations for beginners, what I need is a good definition of these terms.

Thanks for your input
      Werner
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'text' is the program code itself, while 'data' is the entire data
area (all globals and the malloc'd stuff)). Some (most?) of it
can be swapped out; the resident portion of both the text
and data areas are called the 'working set' of the process.
If I'm not mistaken (no docs here at the moment), all sizes are measured in pages (see man entry for getpagesize()).

kind regards,

Jos aka jos@and.nl

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Commented:
jos
Thanks for the VERY FAST reply!
1) ui_tsize is in byte, everything else in 4K pages!
2) Your explanation makes sense, even if the numbers don't add up
   exactly (I guess there is some process header stuff included).
3) Do you know a good (technical) source for that stuff (There
   are so many other open questions)? IBM's Technical Library
   isn't that much helpful.
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