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workqueue: add worker_pool->id

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Add worker_pool->id which is allocated from worker_pool_idr.  This
will be used to record the last associated worker_pool in work->data.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
This commit is contained in:
Tejun Heo 2013-01-24 11:01:33 -08:00
parent 715b06b864
commit 9daf9e678d
1 changed files with 21 additions and 0 deletions
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21
kernel/workqueue.c
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@ -124,6 +124,7 @@ enum {
struct worker_pool {
struct global_cwq *gcwq; /* I: the owning gcwq */
int id; /* I: pool ID */
unsigned int flags; /* X: flags */
struct list_head worklist; /* L: list of pending works */
@ -445,6 +446,10 @@ static atomic_t unbound_pool_nr_running[NR_STD_WORKER_POOLS] = {
[0 ... NR_STD_WORKER_POOLS - 1] = ATOMIC_INIT(0), /* always 0 */
};
/* idr of all pools */
static DEFINE_MUTEX(worker_pool_idr_mutex);
static DEFINE_IDR(worker_pool_idr);
static int worker_thread(void *__worker);
static unsigned int work_cpu(struct work_struct *work);
@ -461,6 +466,19 @@ static struct global_cwq *get_gcwq(unsigned int cpu)
return &unbound_global_cwq;
}
/* allocate ID and assign it to @pool */
static int worker_pool_assign_id(struct worker_pool *pool)
{
int ret;
mutex_lock(&worker_pool_idr_mutex);
idr_pre_get(&worker_pool_idr, GFP_KERNEL);
ret = idr_get_new(&worker_pool_idr, pool, &pool->id);
mutex_unlock(&worker_pool_idr_mutex);
return ret;
}
static atomic_t *get_pool_nr_running(struct worker_pool *pool)
{
int cpu = pool->gcwq->cpu;
@ -3830,6 +3848,9 @@ static int __init init_workqueues(void)
mutex_init(&pool->assoc_mutex);
ida_init(&pool->worker_ida);
/* alloc pool ID */
BUG_ON(worker_pool_assign_id(pool));
}
}