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authorTejun Heo <tj@kernel.org>2015-03-09 09:22:28 -0400
committerTejun Heo <tj@kernel.org>2015-03-09 09:22:28 -0400
commit2607d7a6dba1e790aaacb14600ceffa3aa2f43e7 (patch)
tree612916bb4fcb7a0a58f555815bd712a08ae1fa48 /kernel/workqueue.c
parente2dca7adff8f3fae0ab250a6362798550b3c79ee (diff)
downloadlinux-sh-2607d7a6dba1e790aaacb14600ceffa3aa2f43e7.tar.gz
workqueue: keep track of the flushing task and pool manager
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 <tj@kernel.org>
Diffstat (limited to 'kernel/workqueue.c')
-rw-r--r--kernel/workqueue.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 6b9b0dc3dea5..0c329a6f0c51 100644
--- 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 */
@@ -1918,9 +1919,11 @@ static bool manage_workers(struct worker *worker)
*/
if (!mutex_trylock(&pool->manager_arb))
return false;
+ pool->manager = worker;
maybe_create_worker(pool);
+ pool->manager = NULL;
mutex_unlock(&pool->manager_arb);
return true;
}
@@ -2310,6 +2313,7 @@ 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)
@@ -2358,6 +2362,7 @@ static void insert_wq_barrier(struct pool_workqueue *pwq,
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