CVS commit: src/sys

["Maxime Villard" <maxv%netbsd.org@localhost>]

Module Name:    src
Committed By:   maxv
Date:           Fri May 15 13:09:02 UTC 2020

Modified Files:
        src/sys/kern: subr_kcov.c subr_lockdebug.c
        src/sys/sys: kcov.h

Log Message:
Introduce kcov_silence_enter() and kcov_silence_leave(), to allow to
temporarily disable KCOV on the current lwp. Should be used in the rare
but problematic cases where extreme noise is introduced by an
uninteresting subsystem.

Use this capability to silence KCOV during the LOCKDEBUG lookups. This
divides the size of the KCOV output by more than two in my KCOV+vHCI
tests.


To generate a diff of this commit:
cvs rdiff -u -r1.13 -r1.14 src/sys/kern/subr_kcov.c
cvs rdiff -u -r1.76 -r1.77 src/sys/kern/subr_lockdebug.c
cvs rdiff -u -r1.8 -r1.9 src/sys/sys/kcov.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.