linux-kernel - Re: [PATCH 13/13] workqueue: record global worker ID instead of pool ID in work->data when off-queue

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Date:	Mon, 4 Feb 2013 13:40:57 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 13/13] workqueue: record global worker ID instead of pool
 ID in work->data when off-queue

Hello,

On Fri, Feb 01, 2013 at 02:41:36AM +0800, Lai Jiangshan wrote:
> -	pool = worker_pool_by_id(pool_id);
> -	if (!pool)
> -		return NULL;
> +	rcu_read_lock();
> +	exec = idr_find(&worker_gwid_idr, worker_gwid);
>  
> -	spin_lock(&pool->lock);
> -	exec = find_worker_executing_work(pool, work);
>  	if (exec) {
> -		BUG_ON(pool != exec->pool);
> -		*worker = exec;
> -		return pool;
> +		pool = exec->pool;
> +		spin_lock(&pool->lock);
> +		if (exec->current_work == work &&
> +		    exec->current_func == work->func) {
> +			*worker = exec;
> +			rcu_read_unlock();
> +			return pool;
> +		}
> +		spin_unlock(&pool->lock);
>  	}
> -	spin_unlock(&pool->lock);
> +	rcu_read_unlock();

We're guaranteed to have irq disabled, why not use sched_rcu in
combination with synchronize_sched()?

Thanks.

-- 
tejun
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