From: Christoph Hellwig <hch@infradead.org>
To: Patrick Mansfield <patmans@us.ibm.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>,
linux-scsi@vger.kernel.org
Subject: Re: [PATCH] scsi-misc-2.5 user per-device spare command
Date: Fri, 25 Apr 2003 17:50:35 +0100 [thread overview]
Message-ID: <20030425175035.A4689@infradead.org> (raw)
In-Reply-To: <20030425093718.A8776@beaverton.ibm.com>; from patmans@us.ibm.com on Fri, Apr 25, 2003 at 09:37:18AM -0700
On Fri, Apr 25, 2003 at 09:37:18AM -0700, Patrick Mansfield wrote:
> So we are guaranteed to be able to have at least one IO in flight for all
> devices. With a per-host spare, some device(s) might have to wait
> (generally polling based on an interval dependent on whatever blk_plug_device
> gives us) for a command to become available, and it is not clear what the
> IO behaviour - especially for swap - will be in such cases.
Ok.
> The sdev->sdev_lock (i.e. queue_lock) protects access to sdev->spare_cmd.
Then you'll sleep with the lock help for !GFP_ATOMIC allocations. That's
bad.
next prev parent reply other threads:[~2003-04-25 16:38 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-24 17:02 [PATCH] scsi-misc-2.5 remove scsi_device list_lock Patrick Mansfield
2003-04-24 17:03 ` [PATCH] scsi-misc-2.5 user per-device spare command Patrick Mansfield
2003-04-24 17:03 ` [PATCH] scsi-misc-2.5 fold scsi_alloc_cmd into __scsi_get_command Patrick Mansfield
2003-04-25 10:12 ` [PATCH] scsi-misc-2.5 user per-device spare command Christoph Hellwig
2003-04-25 14:12 ` Luben Tuikov
2003-04-25 16:50 ` Patrick Mansfield
2003-04-25 16:56 ` Christoph Hellwig
2003-04-25 17:45 ` Luben Tuikov
2003-04-25 18:00 ` Patrick Mansfield
2003-04-25 18:36 ` Luben Tuikov
2003-04-25 16:37 ` Patrick Mansfield
2003-04-25 16:50 ` Christoph Hellwig [this message]
2003-04-25 16:57 ` James Bottomley
2003-04-25 20:49 ` Patrick Mansfield
2003-04-25 17:38 ` Luben Tuikov
2003-04-25 10:12 ` [PATCH] scsi-misc-2.5 remove scsi_device list_lock Christoph Hellwig
2003-04-25 10:47 ` Jens Axboe
2003-04-25 16:53 ` Patrick Mansfield
2003-04-25 17:20 ` Jens Axboe
2003-04-25 14:00 ` Luben Tuikov
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