From: Jeff Garzik <jgarzik@pobox.com>
To: "Justin T. Gibbs" <gibbs@scsiguy.com>
Cc: Jens Axboe <axboe@suse.de>,
James Bottomley <James.Bottomley@SteelEye.com>,
SCSI Mailing List <linux-scsi@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH] Fix aic7xxx del_timer_sync() deadlock
Date: Sun, 29 Feb 2004 14:00:17 -0500 [thread overview]
Message-ID: <404236C1.5000001@pobox.com> (raw)
In-Reply-To: <137982704.1078081053@aslan.btc.adaptec.com>
Justin T. Gibbs wrote:
>>>That would imply that blk_start_queue() is OK when there is no more I/O
>>>pending...
>>
>>That is the model. The problem is that you don't have an opportunitty to
>>call blk_start_queue() if there's no more IO pending (you typicall do it
>>from io completion). There's no problem with doing that.
>
>
> You just need to schedule a timer to do the blk_start_queue() call.
> The point of doing this is so that the delay is deterministic.
Now that I understand what Jens is referring to... this depends on the
LLD. In network drivers (from which the model I speak of originated)
and in the upcoming block-level SATA drivers, a delay not needed. The
LLD calls blk_start_queue() when it is ready to receive requests --
which is not a time-based constraint.
Jeff
next prev parent reply other threads:[~2004-02-29 19:00 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-27 18:26 [PATCH] Fix aic7xxx del_timer_sync() deadlock James Bottomley
2004-02-27 19:23 ` Justin T. Gibbs
2004-02-27 19:34 ` James Bottomley
2004-02-27 20:50 ` Justin T. Gibbs
2004-02-28 15:39 ` James Bottomley
2004-02-29 19:26 ` Justin T. Gibbs
2004-02-29 21:10 ` James Bottomley
2004-02-29 22:23 ` Justin T. Gibbs
2004-02-29 21:25 ` James Bottomley
2004-02-28 2:40 ` Jeff Garzik
2004-02-28 9:25 ` Jens Axboe
2004-02-28 23:50 ` Jeff Garzik
2004-02-29 9:13 ` Jens Axboe
2004-02-29 16:21 ` Jeff Garzik
2004-02-29 16:39 ` Jens Axboe
2004-02-29 17:28 ` Jeff Garzik
2004-02-29 17:55 ` Jens Axboe
2004-02-29 18:57 ` Justin T. Gibbs
2004-02-29 19:00 ` Jeff Garzik [this message]
2004-02-29 19:28 ` Justin T. Gibbs
2004-02-29 19:37 ` Jeff Garzik
2004-02-29 19:42 ` Justin T. Gibbs
2004-02-29 19:44 ` Jeff Garzik
2004-02-29 20:06 ` Jens Axboe
2004-02-29 20:20 ` Jeff Garzik
2004-02-29 20:27 ` Jens Axboe
2004-02-29 20:28 ` Jeff Garzik
2004-02-29 19:43 ` Jeff Garzik
2004-02-29 20:04 ` Jens Axboe
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