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From: Rui Paulo <rpaulo@FreeBSD.org>
Date: Mon, 13 Sep 2010 17:49:40 +0000 (UTC)
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Subject: svn commit: r212567 - head
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Author: rpaulo
Date: Mon Sep 13 17:49:39 2010
New Revision: 212567
URL: http://svn.freebsd.org/changeset/base/212567

Log:
  Add a note about userland DTracing.
  
  Sponsored by:	The FreeBSD Foundation
  > Description of fields to fill in above:                     76 columns --|
  > PR:            If a GNATS PR is affected by the change.
  > Submitted by:  If someone else sent in the change.
  > Reviewed by:   If someone else reviewed your modification.
  > Approved by:   If you needed approval for this commit.
  > Obtained from: If the change is from a third party.
  > MFC after:     N [day[s]|week[s]|month[s]].  Request a reminder email.
  > Security:      Vulnerability reference (one per line) or description.
  > Empty fields above will be automatically removed.
  
  M    UPDATING

Modified:
  head/UPDATING

Modified: head/UPDATING
==============================================================================
--- head/UPDATING	Mon Sep 13 17:30:29 2010	(r212566)
+++ head/UPDATING	Mon Sep 13 17:49:39 2010	(r212567)
@@ -22,6 +22,16 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 9.
 	machines to maximize performance.  (To disable malloc debugging, run
 	ln -s aj /etc/malloc.conf.)
 
+20100913:
+	DTrace has grown support for userland tracing. Due to this, DTrace is
+	now i386 and amd64 only.
+	dtruss(1) is now installed by default on those systems and a new
+	kernel module is needed for userland tracing: fasttrap.
+	No changes to your kernel config file are necessary to enable
+	userland tracing, but you might consider adding 'STRIP=' and
+	'CFLAGS+=-fno-omit-frame-pointer' to your make.conf if you want
+	to have informative userland stack traces in DTrace (ustack).
+
 20100725:
 	The acpi_aiboost(4) driver has been removed in favor of the new
 	aibs(4) driver. You should update your kernel configuration file.