Add wq_barrier->task and worker_pool->manager to keep track of the
flushing task and pool manager respectively. These are purely
informational and will be used to implement sysrq dump of workqueues.
Signed-off-by: Tejun Heo <t...@kernel.org>
---
kernel/workqueue.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -159,6 +159,7 @@ struct worker_pool {
/* see manage_workers() for details on the two manager mutexes */
struct mutex manager_arb; /* manager arbitration */
+ struct worker *manager; /* L: purely informational */
struct mutex attach_mutex; /* attach/detach exclusion */
struct list_head workers; /* A: attached workers */
struct completion *detach_completion; /* all workers detached */
@@ -1927,9 +1928,11 @@ static bool manage_workers(struct worker
*/
if (!mutex_trylock(&pool->manager_arb))
return ret;
+ pool->manager = worker;
ret |= maybe_create_worker(pool);
+ pool->manager = NULL;
mutex_unlock(&pool->manager_arb);
return ret;
}
@@ -2319,6 +2322,7 @@ repeat:
struct wq_barrier {
struct work_struct work;
struct completion done;
+ struct task_struct *task; /* purely informational */
};
static void wq_barrier_func(struct work_struct *work)
@@ -2367,6 +2371,7 @@ static void insert_wq_barrier(struct poo
INIT_WORK_ONSTACK(&barr->work, wq_barrier_func);
__set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(&barr->work));
init_completion(&barr->done);
+ barr->task = current;
/*
* If @target is currently being executed, schedule the
--
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