linux-toradex.git/Documentation/workqueue.txt, branch Colibri_T30_LinuxImageV2.1Beta2_20140206

workqueue: CPU hotplug keep idle workers

2012-08-13T21:49:54+00:00

This change merges two patchsets. The first set,
containing 6 patches, reimplements WQ_HIGHPRI
to use a seperate worker_pool. gcwq->pools[0]
is used for normal priority work and pools[1]
for high priority.

The second patchset contains 9 patches and
reimplements CPU hotplug to keep idle workers.
Updates workqueue CPU hotplug path to use a
disassociated global_cwq, which runs as an
unbound one (WQ_UNBOUND). While this requires
rebinding idle workers, overall hotplug path
is much simpler.

Original patchset:
http://thread.gmane.org/gmane.linux.kernel/1329164

Bug 978010

Change-Id: Ic66ec8848a8d111b5278e63ef6a410846dfd8fcc
Signed-off-by: Mitch Luban 
Reviewed-on: http://git-master/r/118387
Reviewed-by: Diwakar Tundlam 
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Peter Boonstoppel 
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bharat Nihalani

workqueue: Document debugging tricks

2011-03-31T11:40:42+00:00

It is not obvious how to debug run-away workers.

These are some tips given by Tejun on lkml.

Signed-off-by: Florian Mickler 
Signed-off-by: Tejun Heo

workqueue, freezer: unify spelling of 'freeze' + 'able' to 'freezable'

2011-02-16T16:48:59+00:00

There are two spellings in use for 'freeze' + 'able' - 'freezable' and
'freezeable'.  The former is the more prominent one.  The latter is
mostly used by workqueue and in a few other odd places.  Unify the
spelling to 'freezable'.

Signed-off-by: Tejun Heo 
Reported-by: Alan Stern 
Acked-by: "Rafael J. Wysocki" 
Acked-by: Greg Kroah-Hartman 
Acked-by: Dmitry Torokhov 
Cc: David Woodhouse 
Cc: Alex Dubov 
Cc: "David S. Miller" 
Cc: Steven Whitehouse

workqueue: add and use WQ_MEM_RECLAIM flag

2010-10-11T13:20:26+00:00

Add WQ_MEM_RECLAIM flag which currently maps to WQ_RESCUER, mark
WQ_RESCUER as internal and replace all external WQ_RESCUER usages to
WQ_MEM_RECLAIM.

This makes the API users express the intent of the workqueue instead
of indicating the internal mechanism used to guarantee forward
progress.  This is also to make it cleaner to add more semantics to
WQ_MEM_RECLAIM.  For example, if deemed necessary, memory reclaim
workqueues can be made highpri.

This patch doesn't introduce any functional change.

Signed-off-by: Tejun Heo 
Cc: Jeff Garzik 
Cc: Dave Chinner 
Cc: Steven Whitehouse

workqueue: add documentation

2010-09-13T08:26:52+00:00

Update copyright notice and add Documentation/workqueue.txt.

Randy Dunlap, Dave Chinner: misc fixes.

Signed-off-by: Tejun Heo 
Reviewed-By: Florian Mickler 
Cc: Ingo Molnar 
Cc: Christoph Lameter 
Cc: Randy Dunlap 
Cc: Dave Chinner