linux-kernel - Re: [PATCH 5/6] aio: use lazy workqueues

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Date:	Fri, 21 Aug 2009 11:31:08 -0700
From:	Zach Brown <zach.brown@...cle.com>
To:	Jeff Moyer <jmoyer@...hat.com>
CC:	Jens Axboe <jens.axboe@...cle.com>, linux-kernel@...r.kernel.org,
	jeff@...zik.org, benh@...nel.crashing.org, htejun@...il.com,
	bzolnier@...il.com, alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH 5/6] aio: use lazy workqueues

> So far as I can tell, the aio workqueue isn't used for much these days.
> We could probably get away with switching to keventd.

It's only used by drivers/usb/gadget to implement O_DIRECT reads by
DMAing into kmalloc()ed memory and then performing the copy_to_user() in
the retry thread's task context after it has assumed the submitting
task's mm.

> Zach, isn't
> someone working on a patch to get rid of all of the -EIOCBRETRY
> infrastructure?  That patch would probably make things clearer in this
> area.

Yeah, a startling amount of fs/aio.c vanishes if we get rid of
EIOCBRETRY.  I'm puttering away at it, but I'll be on holiday next week
so it'll be a while before anything emerges.

- z
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