From: Zach Brown <zach.brown@oracle.com>
To: Jeff Moyer <jmoyer@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>,
linux-kernel@vger.kernel.org, jeff@garzik.org,
benh@kernel.crashing.org, htejun@gmail.com, bzolnier@gmail.com,
alan@lxorguk.ukuu.org.uk
Subject: Re: [PATCH 5/6] aio: use lazy workqueues
Date: Fri, 21 Aug 2009 11:31:08 -0700 [thread overview]
Message-ID: <4A8EE7EC.70909@oracle.com> (raw)
In-Reply-To: <x49k50yjzdd.fsf@segfault.boston.devel.redhat.com>
> 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
next prev parent reply other threads:[~2009-08-21 18:32 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-20 10:19 [PATCH 0/6] Lazy workqueues Jens Axboe
2009-08-20 10:19 ` [PATCH 1/6] workqueue: replace singlethread/freezable/rt parameters and variables with flags Jens Axboe
2009-08-20 10:20 ` [PATCH 2/6] workqueue: add support for lazy workqueues Jens Axboe
2009-08-20 12:01 ` Frederic Weisbecker
2009-08-20 12:10 ` Jens Axboe
2009-08-20 10:20 ` [PATCH 3/6] crypto: use " Jens Axboe
2009-08-20 10:20 ` [PATCH 4/6] libata: use lazy workqueues for the pio task Jens Axboe
2009-08-20 12:40 ` Stefan Richter
2009-08-20 12:48 ` Jens Axboe
2009-08-20 10:20 ` [PATCH 5/6] aio: use lazy workqueues Jens Axboe
2009-08-20 15:09 ` Jeff Moyer
2009-08-21 18:31 ` Zach Brown [this message]
2009-08-20 10:20 ` [PATCH 6/6] sunrpc: " Jens Axboe
2009-08-20 12:04 ` [PATCH 0/6] Lazy workqueues Peter Zijlstra
2009-08-20 12:08 ` Jens Axboe
2009-08-20 12:16 ` Peter Zijlstra
2009-08-23 2:42 ` Junio C Hamano
2009-08-24 7:04 ` git send-email defaults Peter Zijlstra
2009-08-24 8:04 ` [PATCH 0/6] Lazy workqueues Jens Axboe
2009-08-24 9:03 ` Junio C Hamano
2009-08-24 9:11 ` Peter Zijlstra
2009-08-20 12:22 ` Frederic Weisbecker
2009-08-20 12:41 ` Jens Axboe
2009-08-20 13:04 ` Tejun Heo
2009-08-20 12:59 ` Steven Whitehouse
2009-08-20 12:55 ` Tejun Heo
2009-08-21 6:58 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2009-08-20 10:17 Jens Axboe
2009-08-20 10:17 ` [PATCH 1/4] direct-io: unify argument passing by adding a dio_args structure Jens Axboe
2009-08-20 10:17 ` [PATCH 1/6] workqueue: replace singlethread/freezable/rt parameters and variables with flags Jens Axboe
2009-08-20 10:17 ` [PATCH 2/4] direct-io: make O_DIRECT IO path be page based Jens Axboe
2009-08-20 10:17 ` [PATCH 2/6] workqueue: add support for lazy workqueues Jens Axboe
2009-08-20 10:17 ` [PATCH 3/6] crypto: use " Jens Axboe
2009-08-20 10:17 ` [PATCH 3/4] direct-io: add a "IO for kernel" flag to kiocb Jens Axboe
2009-08-20 10:17 ` [PATCH 4/6] libata: use lazy workqueues for the pio task Jens Axboe
2009-08-20 10:17 ` [PATCH 4/5] loop: support O_DIRECT transfer mode Jens Axboe
2009-08-20 10:17 ` [PATCH 5/6] aio: use lazy workqueues Jens Axboe
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