From: Christoph Hellwig <hch@lst.de>
To: Hannes Reinecke <hare@suse.de>
Cc: James Bottomley <james.bottomley@hansenpartnership.com>,
Christoph Hellwig <hch@lst.de>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Bart van Assche <bart.vanassche@sandisk.com>,
linux-scsi@vger.kernel.org
Subject: Re: [PATCH 22/23] scsi_dh_alua: Send TEST UNIT READY to poll for transitioning
Date: Tue, 1 Sep 2015 12:34:27 +0200 [thread overview]
Message-ID: <20150901103427.GH9838@lst.de> (raw)
In-Reply-To: <1440679281-13234-23-git-send-email-hare@suse.de>
On Thu, Aug 27, 2015 at 02:41:20PM +0200, Hannes Reinecke wrote:
> Sending a 'REPORT TARGET PORT GROUP' command is a costly operation,
> as the array has to gather information about all ports.
> So instead of using RTPG to poll for a status update when a port
> is in transitioning we should be sending a TEST UNIT READY, and
> wait for the sense code to report success.
The extra state variabe doesn't really help you as it might be stale
just as quickly.
But otherwise looks fine:
Reviewed-by: Christoph Hellwig <hch@lst.de>
next prev parent reply other threads:[~2015-09-01 10:34 UTC|newest]
Thread overview: 93+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-27 12:40 [PATCHv4 00/23] asynchronous ALUA device handler Hannes Reinecke
2015-08-27 12:40 ` [PATCH 01/23] scsi_dh_alua: Disable ALUA handling for non-disk devices Hannes Reinecke
2015-09-01 9:37 ` Christoph Hellwig
2015-09-04 3:36 ` Martin K. Petersen
2015-09-22 18:28 ` Ewan Milne
2015-08-27 12:41 ` [PATCH 02/23] scsi_dh_alua: Use vpd_pg83 information Hannes Reinecke
2015-09-04 3:37 ` Martin K. Petersen
2015-09-22 18:29 ` Ewan Milne
2015-08-27 12:41 ` [PATCH 03/23] scsi_dh_alua: improved logging Hannes Reinecke
2015-09-04 3:38 ` Martin K. Petersen
2015-09-22 18:30 ` Ewan Milne
2015-08-27 12:41 ` [PATCH 04/23] scsi_dh_alua: use standard logging functions Hannes Reinecke
2015-09-01 9:48 ` Christoph Hellwig
2015-09-01 12:39 ` Hannes Reinecke
2015-09-22 18:32 ` Ewan Milne
2015-08-27 12:41 ` [PATCH 05/23] scsi_dh_alua: return standard SCSI return codes in submit_rtpg Hannes Reinecke
2015-09-01 9:52 ` Christoph Hellwig
2015-09-22 18:34 ` Ewan Milne
2015-08-27 12:41 ` [PATCH 06/23] scsi_dh_alua: fixup description of stpg_endio() Hannes Reinecke
2015-09-01 9:52 ` Christoph Hellwig
2015-09-04 3:40 ` Martin K. Petersen
2015-09-22 18:36 ` Ewan Milne
2015-08-27 12:41 ` [PATCH 07/23] scsi: remove scsi_show_sense_hdr() Hannes Reinecke
2015-09-04 3:41 ` Martin K. Petersen
2015-09-22 18:36 ` Ewan Milne
2015-08-27 12:41 ` [PATCH 08/23] scsi_dh_alua: use flag for RTPG extended header Hannes Reinecke
2015-09-04 3:42 ` Martin K. Petersen
2015-09-22 18:37 ` Ewan Milne
2015-08-27 12:41 ` [PATCH 09/23] scsi_dh_alua: use unaligned access macros Hannes Reinecke
2015-09-01 9:53 ` Christoph Hellwig
2015-09-04 3:43 ` Martin K. Petersen
2015-09-22 18:37 ` Ewan Milne
2015-08-27 12:41 ` [PATCH 10/23] scsi_dh_alua: Pass buffer as function argument Hannes Reinecke
2015-09-01 9:55 ` Christoph Hellwig
2015-09-04 3:44 ` Martin K. Petersen
2015-09-22 18:43 ` Ewan Milne
2015-09-24 16:37 ` Hannes Reinecke
2015-08-27 12:41 ` [PATCH 11/23] scsi_dh_alua: Make stpg synchronous Hannes Reinecke
2015-09-01 10:04 ` Christoph Hellwig
2015-09-01 12:58 ` Hannes Reinecke
2015-09-22 18:50 ` Ewan Milne
2015-09-24 16:47 ` Hannes Reinecke
2015-08-27 12:41 ` [PATCH 12/23] scsi_dh_alua: switch to scsi_execute_req_flags() Hannes Reinecke
2015-09-01 10:07 ` Christoph Hellwig
2015-09-22 18:54 ` Ewan Milne
2015-08-27 12:41 ` [PATCH 13/23] scsi_dh_alua: Use separate alua_port_group structure Hannes Reinecke
2015-09-01 10:20 ` Christoph Hellwig
2015-09-01 13:02 ` Hannes Reinecke
2015-09-01 13:44 ` Christoph Hellwig
2015-09-01 14:01 ` Hannes Reinecke
2015-09-01 10:48 ` Christoph Hellwig
2015-09-22 18:57 ` Ewan Milne
2015-08-27 12:41 ` [PATCH 14/23] scsi_dh_alua: allocate RTPG buffer separately Hannes Reinecke
2015-09-22 19:04 ` Ewan Milne
2015-09-24 17:19 ` Hannes Reinecke
2015-08-27 12:41 ` [PATCH 15/23] scsi_dh_alua: simplify sense code handling Hannes Reinecke
2015-09-22 19:10 ` Ewan Milne
2015-09-28 6:41 ` Hannes Reinecke
2015-08-27 12:41 ` [PATCH 16/23] scsi: Add scsi_vpd_lun_id() Hannes Reinecke
2015-09-01 10:22 ` Christoph Hellwig
2015-09-01 12:43 ` Hannes Reinecke
2015-09-22 19:17 ` Ewan Milne
2015-09-28 7:18 ` Hannes Reinecke
2015-08-27 12:41 ` [PATCH 17/23] scsi_dh_alua: use unique device id Hannes Reinecke
2015-09-01 10:25 ` Christoph Hellwig
2015-09-22 19:31 ` Ewan Milne
2015-09-28 7:41 ` Hannes Reinecke
2015-08-27 12:41 ` [PATCH 18/23] revert "scsi_dh_alua: ALUA hander attach should succeed while TPG is transitioning" Hannes Reinecke
2015-09-22 19:34 ` Ewan Milne
2015-08-27 12:41 ` [PATCH 19/23] scsi_dh_alua: Use workqueue for RTPG Hannes Reinecke
2015-09-01 11:15 ` Christoph Hellwig
2015-09-01 12:57 ` Hannes Reinecke
2015-09-02 6:39 ` Christoph Hellwig
2015-09-02 8:48 ` Hannes Reinecke
2015-11-05 20:34 ` Todd Gill
2015-09-22 19:49 ` Ewan Milne
2015-09-22 20:15 ` Hannes Reinecke
2015-09-23 13:58 ` Ewan Milne
2015-08-27 12:41 ` [PATCH 20/23] scsi_dh_alua: Recheck state on unit attention Hannes Reinecke
2015-09-01 10:31 ` Christoph Hellwig
2015-09-22 19:57 ` Ewan Milne
2015-09-23 13:01 ` Hannes Reinecke
2015-08-27 12:41 ` [PATCH 21/23] scsi_dh_alua: update all port states Hannes Reinecke
2015-09-01 10:32 ` Christoph Hellwig
2015-09-22 20:04 ` Ewan Milne
2015-09-22 20:20 ` Hannes Reinecke
2015-08-27 12:41 ` [PATCH 22/23] scsi_dh_alua: Send TEST UNIT READY to poll for transitioning Hannes Reinecke
2015-09-01 10:34 ` Christoph Hellwig [this message]
2015-09-22 20:05 ` Ewan Milne
2015-08-27 12:41 ` [PATCH 23/23] scsi_dh_alua: Update version to 2.0 Hannes Reinecke
2015-09-01 10:34 ` Christoph Hellwig
2015-09-22 20:05 ` Ewan Milne
2015-09-24 16:25 ` [PATCHv4 00/23] asynchronous ALUA device handler Bart Van Assche
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