From 4a93db7b1257f930e723a425574b3de65152c658 Mon Sep 17 00:00:00 2001
From: gnn <gnn@FreeBSD.org>
Date: Fri, 20 Jul 2012 23:56:23 +0000
Subject: [PATCH] Add a new script, hotopen, which shows what uid is opening
 files on a per second basis.  While here clean up the Makefile as well.

MFC after:	1 week
---
 share/dtrace/Makefile |  4 +--
 share/dtrace/hotopen  | 61 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+), 2 deletions(-)
 create mode 100755 share/dtrace/hotopen

diff --git a/share/dtrace/Makefile b/share/dtrace/Makefile
index 71f1e4eeeec9..adbdc84971c4 100644
--- a/share/dtrace/Makefile
+++ b/share/dtrace/Makefile
@@ -12,9 +12,9 @@ SUBDIR= ${_toolkit}
 _toolkit=	toolkit
 .endif
 
-SCRIPTS=	nfsclienttime
+SCRIPTS=	nfsclienttime hotopen
 
-SCRIPTSDIR= ${SHAREDIR}/dtrace/
+SCRIPTSDIR= ${SHAREDIR}/dtrace
 
 NO_OBJ=
 
diff --git a/share/dtrace/hotopen b/share/dtrace/hotopen
new file mode 100755
index 000000000000..551637909669
--- /dev/null
+++ b/share/dtrace/hotopen
@@ -0,0 +1,61 @@
+#!/bin/sh
+#
+# Copyright (c) 2012 George V. Neville-Neil
+# All rights reserved.
+#
+# This software was developed at the University of Cambridge Computer
+# Laboratory with support from a grant from Google, Inc.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+#
+# The hotopen D script periodically outputs  table of which UIDs
+# are opening files.   This is a very quick way to find out if
+# a paritcular user is thrashing a system with rapid calls to
+# open/close.
+#
+# Usage: hotopen
+#
+
+/usr/sbin/dtrace -n '
+#pragma D option quiet
+BEGIN
+{
+	printf("Files opened per UID in the last second.\n");
+}
+
+syscall::open:entry
+{
+	@files[uid] = count();
+	output = 1;
+}
+
+tick-1sec
+/output != 0/
+{
+	printf("%-20Y \n", walltimestamp);
+	printa("uid %d\tcount %@d\n", @files, @files);
+	trunc(@files);
+	output = 0;
+}
+'