lkml.org 
[lkml]   [2007]   [Jul]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subject[PATCH 0/10] CPU hotplug error handling fixes
This series of patches fixes the error handling for cpu hotplug.
The problem is revealed by CPU hotplug/unplug test with fault-injection.

The patch 1-3 are sysfs or driver core related error handling fixes.
These are not directly related to cpu hotplug. But these are needed to
pass the stress test.

The patch 4 changes the behavior when one of the callbacks in notifier
chain returns NOTIFY_BAD with CPU_UP_PREPARE event. This change makes
cpu hotplug error handling simple.

The patch 5 simplifies the cpu hotplug event handling in topology.c
by the patch 4.

The patch 6-10 are error handling fixes in cpu hotplug event callbacks.
These fixes also depend on the change by the patch 4.

Here is the test script I have confirmed with these patches.
I guess we still have the similar bugs that I could not test due to no
hardware. So it may be worth someone trying this script.

----------[ cut here ]----------
#!/bin/bash

FAILTYPE=failslab
CPU=1
CPU_ONLINE=/sys/devices/system/cpu/cpu${CPU}/online
faulty_system()
{
bash -c "echo 1 > /proc/self/make-it-fail && exec $*"
}
[ "$UID" == 0 ] || exit 1
[ -n "$FAILTYPE" -a -f /debug/$FAILTYPE/probability ] || exit 1
[ -f $CPU_ONLINE ] || exit 1
echo N > /debug/$FAILTYPE/ignore-gfp-wait
echo Y > /debug/$FAILTYPE/task-filter
echo 1 > /debug/$FAILTYPE/probability
echo -1 > /debug/$FAILTYPE/times
while true
do
faulty_system "echo 0 > $CPU_ONLINE"
faulty_system "echo 1 > $CPU_ONLINE"
done
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-07-16 16:03    [from the cache]
©2003-2011 Jasper Spaans