linux-kernel - Re: [PATCHSET] workqueue: implement and use WQ

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Date:	Wed, 21 Jul 2010 16:45:25 +0100
From:	David Howells <dhowells@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	dhowells@...hat.com, Arjan van de Ven <arjan@...ux.intel.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	torvalds@...ux-foundation.org, mingo@...e.hu,
	linux-kernel@...r.kernel.org, jeff@...zik.org,
	akpm@...ux-foundation.org, rusty@...tcorp.com.au,
	cl@...ux-foundation.org, oleg@...hat.com, axboe@...nel.dk,
	dwalker@...eaurora.org, stefanr@...6.in-berlin.de,
	florian@...kler.org, andi@...stfloor.org, mst@...hat.com,
	randy.dunlap@...cle.com, Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCHSET] workqueue: implement and use WQ_UNBOUND

Tejun Heo <tj@...nel.org> wrote:

> It will unnecessarily stall the execution of the new work if the last
> work is still running but nothing will be broken correctness-wise.

That's fine.  Better that than risk unexpected reentrance.  You could add a
function to allow an executing work item to yield the hash entry to indicate
that the work_item that invoked it has been destroyed, but it's probably not
worth it, and it has scope for mucking things up horribly if used at the wrong
time.

I presume also that if a work_item being executed on one work queue is queued
on another work queue, then there is no non-reentrancy guarantee (which is
fine; if you don't like that, don't do it).

David
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