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Subject[PATCH 12/13] workqueue: add worker's global worker ID
Date
Add worker->gwid which is allocated from worker_idr.  This
will be used to record the last running worker in work->data.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
kernel/workqueue.c | 28 ++++++++++++++++++++++++++++
kernel/workqueue_internal.h | 1 +
2 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 04d1286..bc57faf 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -439,6 +439,10 @@ static atomic_t unbound_std_pool_nr_running[NR_STD_WORKER_POOLS] = {
static DEFINE_MUTEX(worker_pool_idr_mutex);
static DEFINE_IDR(worker_pool_idr);

+/* idr of all workers */
+static DEFINE_MUTEX(worker_gwid_idr_mutex);
+static DEFINE_IDR(worker_gwid_idr);
+
static int worker_thread(void *__worker);

static struct worker_pool *std_worker_pools(int cpu)
@@ -454,6 +458,26 @@ static int std_worker_pool_pri(struct worker_pool *pool)
return pool - std_worker_pools(pool->cpu);
}

+/* allocate ID and assign it to @worker */
+static int worker_assign_gwid(struct worker *worker)
+{
+ int ret;
+
+ mutex_lock(&worker_gwid_idr_mutex);
+ idr_pre_get(&worker_gwid_idr, GFP_KERNEL);
+ ret = idr_get_new(&worker_gwid_idr, worker, &worker->gwid);
+ mutex_unlock(&worker_gwid_idr_mutex);
+
+ return ret;
+}
+
+static void free_worker_gwid(struct worker *worker)
+{
+ mutex_lock(&worker_gwid_idr_mutex);
+ idr_remove(&worker_gwid_idr, worker->gwid);
+ mutex_unlock(&worker_gwid_idr_mutex);
+}
+
/* allocate ID and assign it to @pool */
static int worker_pool_assign_id(struct worker_pool *pool)
{
@@ -1814,6 +1838,9 @@ static struct worker *create_worker(struct worker_pool *pool)
worker->pool = pool;
worker->id = id;

+ if (worker_assign_gwid(worker))
+ goto fail;
+
if (pool->cpu != WORK_CPU_UNBOUND)
worker->task = kthread_create_on_node(worker_thread,
worker, cpu_to_node(pool->cpu),
@@ -1900,6 +1927,7 @@ static void destroy_worker(struct worker *worker)
spin_unlock_irq(&pool->lock);

kthread_stop(worker->task);
+ free_worker_gwid(worker);
kfree(worker);

spin_lock_irq(&pool->lock);
diff --git a/kernel/workqueue_internal.h b/kernel/workqueue_internal.h
index 328be4a..eccd50c 100644
--- a/kernel/workqueue_internal.h
+++ b/kernel/workqueue_internal.h
@@ -36,6 +36,7 @@ struct worker {
unsigned long last_active; /* L: last active timestamp */
unsigned int flags; /* X: flags */
int id; /* I: worker id */
+ int gwid; /* I: global worker id */

/* for rebinding worker to CPU */
struct work_struct rebind_work; /* L: for busy worker */
--
1.7.7.6


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