[Bug 259940] [linuxulator][wine] no way to query the maximum process ki_size

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259940

            Bug ID: 259940
           Summary: [linuxulator][wine] no way to query the maximum
                    process ki_size
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: damjan.jov@gmail.com

"struct kinfo_proc" lets us query the maximum RSS size ever attained using
"i_rusage.ru_maxrss", but there is no similar field for the maximum "ki_size"
(size of all virtual memory).

Since both Windows and Linux expect this, linuxulator's
sys/compat/linprocfs/linprocfs.c function linprocfs_doprocstatus() completely
omits "VmPeak", while in Wine I've had to lie that "ki_size" is both the
current and maximum usage.

I wonder whether the kernel even captures that statistic?

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