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b31041042a
Rescuers visit different worker_pools to process work items from pools under pressure. Currently, rescuer->pool is updated outside any locking and when an outsider looks at a rescuer, there's no way to tell when and whether rescuer->pool is gonna change. While this doesn't currently cause any problem, it is nasty. With recent worker_maybe_bind_and_lock() changes, we can move rescuer->pool updates inside pool locks such that if rescuer->pool equals a locked pool, it's guaranteed to stay that way until the pool is unlocked. Move rescuer->pool inside pool->lock. This patch doesn't introduce any visible behavior difference. tj: Updated the description. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>
66 lines
2 KiB
C
66 lines
2 KiB
C
/*
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* kernel/workqueue_internal.h
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*
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* Workqueue internal header file. Only to be included by workqueue and
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* core kernel subsystems.
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*/
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#ifndef _KERNEL_WORKQUEUE_INTERNAL_H
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#define _KERNEL_WORKQUEUE_INTERNAL_H
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#include <linux/workqueue.h>
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#include <linux/kthread.h>
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struct worker_pool;
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/*
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* The poor guys doing the actual heavy lifting. All on-duty workers are
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* either serving the manager role, on idle list or on busy hash. For
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* details on the locking annotation (L, I, X...), refer to workqueue.c.
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*
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* Only to be used in workqueue and async.
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*/
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struct worker {
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/* on idle list while idle, on busy hash table while busy */
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union {
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struct list_head entry; /* L: while idle */
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struct hlist_node hentry; /* L: while busy */
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};
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struct work_struct *current_work; /* L: work being processed */
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work_func_t current_func; /* L: current_work's fn */
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struct pool_workqueue *current_pwq; /* L: current_work's pwq */
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struct list_head scheduled; /* L: scheduled works */
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struct task_struct *task; /* I: worker task */
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struct worker_pool *pool; /* I: the associated pool */
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/* L: for rescuers */
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/* 64 bytes boundary on 64bit, 32 on 32bit */
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unsigned long last_active; /* L: last active timestamp */
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unsigned int flags; /* X: flags */
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int id; /* I: worker id */
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/* for rebinding worker to CPU */
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struct work_struct rebind_work; /* L: for busy worker */
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/* used only by rescuers to point to the target workqueue */
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struct workqueue_struct *rescue_wq; /* I: the workqueue to rescue */
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};
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/**
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* current_wq_worker - return struct worker if %current is a workqueue worker
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*/
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static inline struct worker *current_wq_worker(void)
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{
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if (current->flags & PF_WQ_WORKER)
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return kthread_data(current);
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return NULL;
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}
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/*
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* Scheduler hooks for concurrency managed workqueue. Only to be used from
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* sched.c and workqueue.c.
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*/
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void wq_worker_waking_up(struct task_struct *task, unsigned int cpu);
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struct task_struct *wq_worker_sleeping(struct task_struct *task,
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unsigned int cpu);
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#endif /* _KERNEL_WORKQUEUE_INTERNAL_H */
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