events.
+.Pp
+Option
+.Fl x Cm stackframes=100
+increases the maximum number of kernel stack frames to unwind during
+.Fn stack .
+.Pp
+Checking if
+.Ar arg0
+is not zero makes sure that profiling happens
+when the program is in the kernel context.
+.Pp
+Refer to
+.Lk https://www.brendangregg.com/flamegraphs.html
+to learn about generating flame graphs from the obtained stack traces.
+.Sh SEE ALSO
+.Xr dtrace 1 ,
+.Xr tracing 7
+.Rs
+.%B The illumos Dynamic Tracing Guide
+.%O Chapter profile Provider
+.%D 2008
+.%U https://www.illumos.org/books/dtrace/chp-profile.html
+.Re
+.Rs
+.%A Brendan Gregg
+.%A Jim Mauro
+.%B DTrace: Dynamic Tracing in Oracle Solaris, Mac OS X and FreeBSD
+.%I Prentice Hall
+.%P pp. 24\(en25
+.%D 2011
+.%U https://www.brendangregg.com/dtracebook/
+.Re
+.Sh AUTHORS
+This manual page was written by
+.An Mateusz Piotrowski Aq Mt 0mp@FreeBSD.org .