From 7b884f27060e749f017fc965c55736f72c3c719e Mon Sep 17 00:00:00 2001
From: Brooks Davis <brooks@FreeBSD.org>
Date: Mon, 16 Mar 2009 10:17:31 +0000
Subject: [PATCH] Add an idea for groups of processes with collective resource
 limits (aka jobs).

---
 en/projects/ideas/ideas.xml | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/en/projects/ideas/ideas.xml b/en/projects/ideas/ideas.xml
index 50e2e93dd3..8fbdc10439 100644
--- a/en/projects/ideas/ideas.xml
+++ b/en/projects/ideas/ideas.xml
@@ -15,7 +15,7 @@ Ideas//EN"
 <ideas>
   <cvs:keywords xmlns:cvs="http://www.FreeBSD.org/XML/CVS" version="1.0">
     <cvs:keyword name="freebsd">
-      $FreeBSD: www/en/projects/ideas/ideas.xml,v 1.115 2009/03/16 00:27:38 brooks Exp $
+      $FreeBSD: www/en/projects/ideas/ideas.xml,v 1.116 2009/03/16 00:38:27 brooks Exp $
     </cvs:keyword>
   </cvs:keywords>
 
@@ -712,6 +712,41 @@ href="http://info.iet.unipi.it/~luigi/FreeBSD/linux_bsd_kld.html">here</a>.
 	</desc>
       </idea>
 
+      <idea id="per-job-limits" class="soc">
+	<title>Collective limits on set of processes (a.k.a. jobs)</title>
+
+	<desc>
+<p><strong>Technical contact</strong>: <a
+  href="mailto:brooks@freebsd.org">Brooks Davis</a></p>
+
+<p>In SGI's Irix operating system, there is a concept of a job which is
+  a collection of processes.  These processes share a set of resource
+  limits similar to those accessible through the set/getrlimit and
+  getrusage system calls.  Schedulers such as Sun Grid Engine currently
+  implement tracking the processes that make up a job and enforcing
+  collective limits on them in an adhoc manner.  Having first class
+  kernel support would be useful.</p>
+
+<p>It seems most likely that implementing something like the Irix
+  interface would be the most useful approach since that would enable us
+  to leverage existing code.  Implementers will need to make sure that
+  the job construct has no negative performance implications when not
+  enabled (ideally, processes that are not part of jobs should be
+  unaffected) and quantify the impact on perfomance when enabled.</p>
+
+<p><strong>References</strong>: <a
+  href="http://techpubs.sgi.com/library/tpl/cgi-bin/browse.cgi?cmd=search&coll=0650&db=man&pth=&srch=jid_t&searchpth=man&rpt=20">Irix
+  Man Pages mentioning jid_t</a></p>
+
+<p><strong>Requirements</strong>:</p>
+<ul>
+  <li>Good knowledge of C.</li>
+  <li>Kernel awareness.</li>
+  <li>Ability to implement functionality from interface specifications.</li>
+</ul>
+	</desc>
+      </idea>
+
       <idea id="psched" class="soc">
 	<title>Geom-based Disk Schedulers</title>