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Date: Sat, 30 Dec 1995 03:03:14 +1100
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199512291603.DAA21468@godzilla.zeta.org.au>
To: current@freefall.freebsd.org
Subject: Re: cvs commit: src/usr.sbin/kgmon kgmon.8 kgmon.c
Sender: owner-current@FreeBSD.ORG
Precedence: bulk

To configure the kernel for this:

	config -n -pp YOUR_KERNEL
	cd /sys/compile/YOUR_KERNEL
	make clean			# not optional
	make depend
	make				# gcc must be up to date for this

Use it something like:

	high resolution (new)			low resolution (old)
	---------------------			--------------------
	kgmon -rB				kgmon -rb
	run_test				run_test
	kgmon -hp				kgmon -hp
	gprof4 -u /kernel >gprof4.out		gprof -u /kernel >gprof.out

Bruce

>bde         95/12/29 07:30:09

>  Modified:    lib/libc/gmon  mcount.c
>               sys/i386/conf  files.i386
>               sys/i386/include  asmacros.h profile.h
>               sys/kern  subr_prof.c
>               sys/libkern  mcount.c
>               sys/sys   gmon.h
>               usr.bin   Makefile
>               usr.sbin/config  config.8 mkmakefile.c
>               usr.sbin/kgmon  kgmon.8 kgmon.c
>  Added:       sys/i386/isa  prof_machdep.c
>               usr.bin/gprof4  Makefile
>  Log:
>  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.
>  
>  Revision  Changes    Path
>  1.4       +148 -8    src/lib/libc/gmon/mcount.c
>  1.122     +2 -1      src/sys/i386/conf/files.i386
>  1.6       +64 -28    src/sys/i386/include/asmacros.h
>  1.5       +39 -15    src/sys/i386/include/profile.h
>  1.16      +90 -5     src/sys/kern/subr_prof.c
>  1.5       +3 -179    src/sys/libkern/mcount.c
>  1.8       +57 -9     src/sys/sys/gmon.h
>  1.64      +2 -1      src/usr.bin/Makefile
>  1.6       +5 -0      src/usr.sbin/config/config.8
>  1.14      +6 -2      src/usr.sbin/config/mkmakefile.c
>  1.3       +9 -2      src/usr.sbin/kgmon/kgmon.8
>  1.6       +27 -10    src/usr.sbin/kgmon/kgmon.c