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| author |   Tejun Heo <tj@kernel.org> | 2015-03-09 09:22:28 -0400 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2015-03-09 09:22:28 -0400 |
| commit | 2607d7a6dba1e790aaacb14600ceffa3aa2f43e7 (patch) | |
| tree | 612916bb4fcb7a0a58f555815bd712a08ae1fa48 /kernel/workqueue.c | |
| parent | workqueue: make the workqueues list RCU walkable (diff) | |
| download | linux-dev-2607d7a6dba1e790aaacb14600ceffa3aa2f43e7.tar.xz linux-dev-2607d7a6dba1e790aaacb14600ceffa3aa2f43e7.zip | |
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.c | 5 |
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 |