From owner-freebsd-doc  Mon Jan  6  5:55:46 2003
Delivered-To: freebsd-doc@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id AE8F237B401
	for <docs@freebsd.org>; Mon,  6 Jan 2003 05:55:44 -0800 (PST)
Received: from critter.freebsd.dk (critter.freebsd.dk [212.242.86.163])
	by mx1.FreeBSD.org (Postfix) with ESMTP id DC1E343EB2
	for <docs@freebsd.org>; Mon,  6 Jan 2003 05:55:43 -0800 (PST)
	(envelope-from phk@critter.freebsd.dk)
Received: from critter.freebsd.dk (localhost [127.0.0.1])
	by critter.freebsd.dk (8.12.6/8.12.6) with ESMTP id h06DtaHj019119
	for <docs@freebsd.org>; Mon, 6 Jan 2003 14:55:36 +0100 (CET)
	(envelope-from phk@critter.freebsd.dk)
To: docs@freebsd.org
Subject: doc/handbook/something fodder...
Date: Mon, 06 Jan 2003 14:55:36 +0100
Message-ID: <19118.1041861336@critter.freebsd.dk>
From: Poul-Henning Kamp <phk@critter.freebsd.dk>
Sender: owner-freebsd-doc@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-doc.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-doc>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-doc>
X-Loop: FreeBSD.org


I have no idea where this belongs in our doc, but it should go 
somewhere I think.

Poul-Henning


I have committed the bits needed to use GCC's basicblock profiling
on -current.

Make sure to recompile the kernbb(8) program first.

Here's an simple example how to profile a single file (vfs_bio.c):

	cd /sys/i386/conf
	config YOURKERNEL
	cd ../compile/YOURKERNEL
	make depend && make all
	rm vfs_bio.o
	make vfs_bio.o DEBUG="--test-coverage --profile-arcs"
	make all && make install
	reboot
	# run your test.
	kernbb
	cd /sys/i386/compile/YOURKERNEL
	gcov vfs_bio.c
	# examine vfs_bio.c.gcov

If you want to profile multiple files, you just give them all the
same treatment as vfs_bio.

It's perfectly possible to profile the entire kernel if you want to.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-doc" in the body of the message