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workqueue: introduce for_each_pool()

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With the scheduled unbound pools with custom attributes, there will be
multiple unbound pools, so it wouldn't be able to use
for_each_wq_cpu() + for_each_std_worker_pool() to iterate through all
pools.

Introduce for_each_pool() which iterates through all pools using
worker_pool_idr and use it instead of for_each_wq_cpu() +
for_each_std_worker_pool() combination in freeze_workqueues_begin().

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
This commit is contained in:
Tejun Heo 2013-03-12 11:29:58 -07:00
parent 49e3cf44df
commit 1711696955
1 changed files with 21 additions and 15 deletions
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36
kernel/workqueue.c
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@ -294,6 +294,14 @@ static inline int __next_wq_cpu(int cpu, const struct cpumask *mask,
(cpu) < WORK_CPU_END; \
(cpu) = __next_wq_cpu((cpu), cpu_online_mask, 3))
/**
* for_each_pool - iterate through all worker_pools in the system
* @pool: iteration cursor
* @id: integer used for iteration
*/
#define for_each_pool(pool, id) \
idr_for_each_entry(&worker_pool_idr, pool, id)
/**
* for_each_pwq - iterate through all pool_workqueues of the specified workqueue
* @pwq: iteration cursor
@ -3586,33 +3594,31 @@ EXPORT_SYMBOL_GPL(work_on_cpu);
*/
void freeze_workqueues_begin(void)
{
unsigned int cpu;
struct worker_pool *pool;
int id;
spin_lock_irq(&workqueue_lock);
WARN_ON_ONCE(workqueue_freezing);
workqueue_freezing = true;
for_each_wq_cpu(cpu) {
struct worker_pool *pool;
for_each_pool(pool, id) {
struct workqueue_struct *wq;
for_each_std_worker_pool(pool, cpu) {
spin_lock(&pool->lock);
spin_lock(&pool->lock);
WARN_ON_ONCE(pool->flags & POOL_FREEZING);
pool->flags |= POOL_FREEZING;
WARN_ON_ONCE(pool->flags & POOL_FREEZING);
pool->flags |= POOL_FREEZING;
list_for_each_entry(wq, &workqueues, list) {
struct pool_workqueue *pwq = get_pwq(cpu, wq);
list_for_each_entry(wq, &workqueues, list) {
struct pool_workqueue *pwq = get_pwq(pool->cpu, wq);
if (pwq && pwq->pool == pool &&
(wq->flags & WQ_FREEZABLE))
pwq->max_active = 0;
}
spin_unlock(&pool->lock);
if (pwq && pwq->pool == pool &&
(wq->flags & WQ_FREEZABLE))
pwq->max_active = 0;
}
spin_unlock(&pool->lock);
}
spin_unlock_irq(&workqueue_lock);