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Date: Mon, 18 Dec 2006 16:51:19 -0800 From: Andrew Morton <akpm@...l.org> To: Oleg Nesterov <oleg@...sign.ru> Cc: David Howells <dhowells@...hat.com>, Christoph Hellwig <hch@...radead.org>, Ingo Molnar <mingo@...e.hu>, Linus Torvalds <torvalds@...l.org>, linux-kernel@...r.kernel.org Subject: Re: [PATCH, RFC rc1-mm1] implement flush_work() On Mon, 18 Dec 2006 23:17:14 +0300 Oleg Nesterov <oleg@...sign.ru> wrote: > Add ->current_work to the "struct cpu_workqueue_struct", it points to > currently running "struct queue_work". When flush_work(work) detects > ->current_work == work, it inserts a barrier at the _head_ of ->worklist > (and thus right _after_ that work) and waits for completition. This means > that the next work fired on that CPU will be this barrier, or another > barrier queued by concurrent flush_work(), so the caller of flush_work() > will be woken before any "regular" work has a chance to run. > > Since __queue_work() does both set_wq_data() and list_add_tail() atomically > under cwq->lock, flush_work() can remove the pending work from queue when > it sees "get_wq_data(work) == cwq". Seems sane. > NOTE: flush_work() doesn't like no-auto-release works. Unless they go away > we can fix this later or add the "don't do this" comment. Yes, let's make the _NAR stuff go away pleeeeze. It's fairly straightforward, and is on my todo list somewhere. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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