On Sun, Jun 10, 2012 at 12:38 PM, Andriy Gapon <[email protected]> wrote: > Interesting observations, thank you. > Do you use -O2 or higher optimization for kernel/modules build? > I use only -O1. > > Here are some stats from my system: > $ dtrace -ln fbt::: | fgrep -c entry > 16876 > $ dtrace -ln fbt::: | fgrep -c return > 16729 > > So, 147 functions without return probe.
Try re-compiling with -foptimize-sibling-calls. That enables the tail call optimization in gcc, and therefore you get many functions with no ret instruction (and thus no return probe in DTrace) _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
