linux-master/kernel/workqueue.c

20  * automatically managed.  There are two worker pools for each CPU (one for
22  * pools for workqueues which are not bound to any specific CPU - the
23  * number of these backing pools is dynamic.
106 	NR_STD_WORKER_POOLS	= 2,		/* # standard pools per cpu */
225 	int			refcnt;		/* PL: refcnt for unbound pools */
440 static DEFINE_MUTEX(wq_pool_mutex);	/* protects pools and workqueues list */
476 /* to raise softirq for the BH worker pools on other CPUs */
480 /* the BH worker pools */
484 /* the per-cpu worker pools */
488 static DEFINE_IDR(worker_pool_idr);	/* PR: idr of all pools */
490 /* PL: hash of all unbound pools keyed by pool->attrs */
493 /* I: attributes used when instantiating standard unbound pools on demand */
496 /* I: attributes used when instantiating ordered pools on demand */
920  * pools are managed.  Unless noted otherwise, these functions assume that
929  * function will always return %true for unbound pools as long as the
1659 		 * As both pwqs and pools are RCU protected, the
1981 	 * multiple pwqs and pools may be sharing the nr_active count. When a
2323 	 * pwq is determined and locked. For unbound pools, we could have raced
3184 	 * Kick @pool if necessary. It's always noop for per-cpu worker pools
4883  * and this function should be able to release pools which went through,
5466 			struct worker_pool __percpu *pools;
5470 				pools = bh_worker_pools;
5472 				pools = cpu_worker_pools;
5474 			pool = &(per_cpu_ptr(pools, cpu)[highpri]);
6340  * Called from a sysrq handler and prints out all busy workqueues and pools.
6350 	pr_info("Showing busy workqueues and worker pools:\n");
6432  * worker pools serve mix of short, long and very long running works making
6435  * This is solved by allowing the pools to be disassociated from the CPU
6594 		/* BH pools aren't affected by hotplug */
7418  * Workqueue watchdog monitors all worker pools periodically and dumps
7419  * state if some pools failed to make forward progress for a while where
7472 	pr_info("Showing backtraces of running workers in stalled CPU-bound worker pools:\n");
7713 	/* initialize BH and CPU pools */
7815  * executing the work items yet. Populate the worker pools with the initial
7829 	 * Per-cpu pools created earlier could be missing node hint. Fix them