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author | Tejun Heo <tj@kernel.org> | 2013-03-12 11:30:04 -0700 |
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committer | Tejun Heo <tj@kernel.org> | 2013-03-12 11:30:04 -0700 |
commit | 9e8cd2f5898ab6710ad81f4583fada08bf8049a4 (patch) | |
tree | bb3950d07a5e23be7817eaaa0517066b7d5f82fb /include/linux/workqueue.h | |
parent | c9178087acd71b4ea010ea48e147cf66952d2da9 (diff) | |
download | linux-stable-9e8cd2f5898ab6710ad81f4583fada08bf8049a4.tar.gz linux-stable-9e8cd2f5898ab6710ad81f4583fada08bf8049a4.tar.bz2 linux-stable-9e8cd2f5898ab6710ad81f4583fada08bf8049a4.zip |
workqueue: implement apply_workqueue_attrs()
Implement apply_workqueue_attrs() which applies workqueue_attrs to the
specified unbound workqueue by creating a new pwq (pool_workqueue)
linked to worker_pool with the specified attributes.
A new pwq is linked at the head of wq->pwqs instead of tail and
__queue_work() verifies that the first unbound pwq has positive refcnt
before choosing it for the actual queueing. This is to cover the case
where creation of a new pwq races with queueing. As base ref on a pwq
won't be dropped without making another pwq the first one,
__queue_work() is guaranteed to make progress and not add work item to
a dead pwq.
init_and_link_pwq() is updated to return the last first pwq the new
pwq replaced, which is put by apply_workqueue_attrs().
Note that apply_workqueue_attrs() is almost identical to unbound pwq
part of alloc_and_link_pwqs(). The only difference is that there is
no previous first pwq. apply_workqueue_attrs() is implemented to
handle such cases and replaces unbound pwq handling in
alloc_and_link_pwqs().
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Diffstat (limited to 'include/linux/workqueue.h')
-rw-r--r-- | include/linux/workqueue.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h index c270b4eedf16..e152394fa7eb 100644 --- a/include/linux/workqueue.h +++ b/include/linux/workqueue.h @@ -410,6 +410,8 @@ extern void destroy_workqueue(struct workqueue_struct *wq); struct workqueue_attrs *alloc_workqueue_attrs(gfp_t gfp_mask); void free_workqueue_attrs(struct workqueue_attrs *attrs); +int apply_workqueue_attrs(struct workqueue_struct *wq, + const struct workqueue_attrs *attrs); extern bool queue_work_on(int cpu, struct workqueue_struct *wq, struct work_struct *work); |