From: James Bottomley <James.Bottomley@SteelEye.com>
To: Jens Axboe <axboe@suse.de>
Cc: Tejun Heo <htejun@gmail.com>,
Christoph Hellwig <hch@infradead.org>,
SCSI Mailing List <linux-scsi@vger.kernel.org>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH scsi-misc-2.6 03/05] scsi: make scsi_queue_insert() use blk_requeue_request()
Date: Thu, 21 Apr 2005 08:45:28 -0400 [thread overview]
Message-ID: <1114087528.5054.2.camel@mulgrave> (raw)
In-Reply-To: <20050421061026.GE9371@suse.de>
On Thu, 2005-04-21 at 08:10 +0200, Jens Axboe wrote:
> I wondered about this action recently myself. What is the point in
> requeueing this request, only to call scsi_run_queue() ->
> blk_run_queue() -> issue same request. If the point really is to reissue
> the request immediately, I can think of many ways more efficient than
> this :-)
Well ... that's because the logic that decides whether to plug the queue
or simply exit is in the scsi_request_fn(). That's what the comment is
about. We could abstract the check into a function, but (unless you
have any suggestions on rewording it) I thought the comment made what
was going on reasonably clear.
James
next prev parent reply other threads:[~2005-04-21 12:45 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-19 23:15 [PATCH scsi-misc-2.6 00/05] scsi: change REQ_SPECIAL/REQ_SOFTBARRIER usages Tejun Heo
2005-04-19 23:15 ` [PATCH scsi-misc-2.6 01/05] scsi: make blk layer set REQ_SOFTBARRIER when a request is dispatched Tejun Heo
2005-04-20 6:30 ` Jens Axboe
2005-04-20 6:44 ` Tejun Heo
2005-04-20 7:40 ` Tejun Heo
2005-04-20 7:58 ` Nick Piggin
2005-04-20 8:37 ` Tejun Heo
2005-04-20 8:38 ` Jens Axboe
2005-04-20 9:04 ` Nick Piggin
2005-04-20 9:14 ` Jens Axboe
2005-04-20 9:24 ` Nick Piggin
2005-04-20 9:44 ` Jens Axboe
2005-04-20 22:58 ` Tejun Heo
2005-04-19 23:15 ` [PATCH scsi-misc-2.6 02/05] scsi: remove REQ_SPECIAL in scsi_init_io() Tejun Heo
2005-04-19 23:15 ` [PATCH scsi-misc-2.6 03/05] scsi: make scsi_queue_insert() use blk_requeue_request() Tejun Heo
2005-04-20 23:24 ` James Bottomley
2005-04-21 0:20 ` Tejun Heo
2005-04-21 2:16 ` James Bottomley
2005-04-21 2:29 ` Tejun Heo
2005-04-21 2:43 ` Tejun Heo
2005-04-21 6:10 ` Jens Axboe
2005-04-21 12:45 ` James Bottomley [this message]
2005-04-22 11:37 ` Jens Axboe
2005-04-19 23:15 ` [PATCH scsi-misc-2.6 04/05] scsi: make scsi_requeue_request() " Tejun Heo
2005-04-19 23:16 ` [PATCH scsi-misc-2.6 05/05] scsi: remove requeue feature from blk_insert_request() Tejun Heo
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