Implemented non-statistical kernel profiling. This is based on

looking at a high resolution clock for each of the following events:
function call, function return, interrupt entry, interrupt exit,
and interesting branches.  The differences between the times of
these events are added at appropriate places in a ordinary histogram
(as if very fast statistical profiling sampled the pc at those
places) so that ordinary gprof can be used to analyze the times.

gmon.h:
Histogram counters need to be 4 bytes for microsecond resolutions.
They will need to be larger for the 586 clock.
The comments were vax-centric and wrong even on vaxes.  Does anyone
disagree?

gprof4.c:
The standard gprof should support counters of all integral sizes
and the size of the counter should be in the gmon header.  This
hack will do until then.  (Use gprof4 -u to examine the results
of non-statistical profiling.)

config/*:
Non-statistical profiling is configured with `config -pp'.
`config -p' still gives ordinary profiling.

kgmon/*:
Non-statistical profiling is enabled with `kgmon -B'.  `kgmon -b'
still enables ordinary profiling (and distables non-statistical
profiling) if non-statistical profiling is configured.

1 files changed, 14 insertions, 0 deletions

diff --git a/usr.bin/gprof4/Makefile b/usr.bin/gprof4/Makefile
new file mode 100644
index 0000000..f5c2c83
--- /dev/null
+++ b/usr.bin/gprof4/Makefile
@@ -0,0 +1,14 @@
+# This was cloned from the Makefile for gprof by changing PROG from gprof
+# to gprof4, adding NOMAN and PATH, adding -DGPROF4 to CFLAGS and deleting
+# beforeinstall.
+
+#	@(#)Makefile	5.17 (Berkeley) 5/11/90
+
+PROG=	gprof4
+NOMAN=	noman
+SRCS=	gprof.c arcs.c dfn.c lookup.c ${MACHINE}.c hertz.c \
+	printgprof.c printlist.c
+CFLAGS+=-DGPROF4
+.PATH:	${.CURDIR}/../../usr.bin/gprof
+
+.include <bsd.prog.mk>