linux-toradex.git/Documentation/workqueue.txt, branch v4.6-rc6

workqueue: fix trivial typo in Documentation/workqueue.txt

2015-05-05T13:50:38+00:00

Signed-off-by: Chris Bainbridge 
Signed-off-by: Tejun Heo

workqueue: Correct/Drop references to gcwq in Documentation

2013-08-21T14:32:09+00:00

No functional changes. This patch fixes the post gcwq comments in
Documentation/workqueue.txt.

tj: Whitespace adjustments.  Minor updates.

Signed-off-by: Libin 
Signed-off-by: Tejun Heo

workqueue: mark WQ_NON_REENTRANT deprecated

2013-07-30T12:30:16+00:00

dbf2576e37 ("workqueue: make all workqueues non-reentrant") made
WQ_NON_REENTRANT no-op but the following patches didn't remove the
flag or update the documentation.  Let's mark the flag deprecated and
update the documentation accordingly.

Signed-off-by: Tejun Heo

workqueue: reimplement WQ_HIGHPRI using a separate worker_pool

2012-07-14T05:24:45+00:00

WQ_HIGHPRI was implemented by queueing highpri work items at the head
of the global worklist.  Other than queueing at the head, they weren't
handled differently; unfortunately, this could lead to execution
latency of a few seconds on heavily loaded systems.

Now that workqueue code has been updated to deal with multiple
worker_pools per global_cwq, this patch reimplements WQ_HIGHPRI using
a separate worker_pool.  NR_WORKER_POOLS is bumped to two and
gcwq->pools[0] is used for normal pri work items and ->pools[1] for
highpri.  Highpri workers get -20 nice level and has 'H' suffix in
their names.  Note that this change increases the number of kworkers
per cpu.

POOL_HIGHPRI_PENDING, pool_determine_ins_pos() and highpri chain
wakeup code in process_one_work() are no longer used and removed.

This allows proper prioritization of highpri work items and removes
high execution latency of highpri work items.

v2: nr_running indexing bug in get_pool_nr_running() fixed.

v3: Refreshed for the get_pool_nr_running() update in the previous
    patch.

Signed-off-by: Tejun Heo 
Reported-by: Josh Hunt 
LKML-Reference: 
Cc: Tony Luck 
Cc: Fengguang Wu

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