[Bug 254639] Fork syscall performance

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254639

--- Comment #2 from Kirill <kirill at varnakov.com> ---
I have 192GB. Trace:

dtrace -q -n 'fbt::pmap_copy:entry /pid == $target/{self->ts = timestamp}
fbt::pmap_copy:return /self->ts/{@ = sum(timestamp - self->ts); self->ts = 0;}
tick-1s {printa("spent %@dns
 copying\n", @); clear(@);}' -c "python test_fork.py"
spent 238724ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
25576 8.959986448287964
spent 525185651ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 279323ns copying
25593 4.342242956161499
spent 434345424ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 352273ns copying
spent 423458987ns copying
spent 0ns copying
25597 7.248447418212891
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
25602 4.694051027297974
spent 432109608ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
spent 0ns copying
25619 4.810415983200073

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