linux-kernel - [PATCH 1/1] hotplug cpu: documentation addition to downing a cpu

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Message-ID: <20070827202133.GA4728@sgi.com>
Date:	Mon, 27 Aug 2007 15:21:33 -0500
From:	Cliff Wickman <cpw@....com>
To:	akpm@...ux-foundation.org, ego@...ibm.com, mingo@...e.hu,
	vatsa@...ibm.com, oleg@...sign.ru, pj@....com
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] hotplug cpu: documentation addition to downing a cpu


In answer to Andrew:
> How do we communicate this new design/feature to our users?
> Documentation/cpusets.txt, perhaps?  Documentation/cpu-hotplug.txt?
> git-log?  ;)

Patch "[PATCH 1/1] V4: hotplug cpu: migrate a task within its cpuset" may
warrant an addition to the documentation.  I would propose this note
in cpu-hotplug.txt.

Diffed against 2.6.23-rc3

Signed-off-by: Cliff Wickman <cpw@....com>

---
 Documentation/cpu-hotplug.txt |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: linus.070821/Documentation/cpu-hotplug.txt
===================================================================
--- linus.070821.orig/Documentation/cpu-hotplug.txt
+++ linus.070821/Documentation/cpu-hotplug.txt
@@ -220,7 +220,9 @@ A: The following happen, listed in no pa
   CPU_DOWN_PREPARE or CPU_DOWN_PREPARE_FROZEN, depending on whether or not the
   CPU is being offlined while tasks are frozen due to a suspend operation in
   progress
-- All process is migrated away from this outgoing CPU to a new CPU
+- All processes are migrated away from this outgoing CPU to new CPUs.
+  The new CPU is chosen from each process' current cpuset, which may be
+  a subset of all online CPUs.
 - All interrupts targeted to this CPU is migrated to a new CPU
 - timers/bottom half/task lets are also migrated to a new CPU
 - Once all services are migrated, kernel calls an arch specific routine
-- 
Cliff Wickman
Silicon Graphics, Inc.
cpw@....com
(651) 683-3824
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