On Fri, 8 Jun 2007, Andrew Gallatin wrote:
gallatin 2007-06-08 12:43:26 UTC
FreeBSD src repository
Modified files:
sys/net pfil.h
Log:
Correct the definition of PFIL_HOOKED() so that it compares
the value of ph_nhooks to zero, not the address. This removes
extranious calls to pfil_run_hooks (and an rw lock) from the
network stack's critical path when no pfil hooks are active.
Nice catch. :-)
I've not done a line-by-line KTR trace of all locking in the standard UDP and
TCP input and output paths in a while, but I suspect such a thing is called
for before 7.0 goes out the door in order to see what else has slipped in.
It's generally a highly informative exercise.
Robert N M Watson
Computer Laboratory
University of Cambridge
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