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From: Tejun Heo <tj@kernel.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Dan Williams <dan.j.williams@intel.com>,
	Todd E Brandt <todd.e.brandt@linux.intel.com>,
	Phillip Susi <psusi@ubuntu.com>, Aaron Lu <aaron.lu@intel.com>,
	SCSI development list <linux-scsi@vger.kernel.org>
Subject: Re: Disk spin-up optimization during system resume
Date: Fri, 17 Jan 2014 15:24:33 -0500	[thread overview]
Message-ID: <20140117202433.GB23024@htj.dyndns.org> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1401171513500.6173-100000@netrider.rowland.org>

On Fri, Jan 17, 2014 at 03:15:54PM -0500, Alan Stern wrote:
> You will have to argue this point with Phillip.
> 
> If necessary, we could add a sysfs attribute to force a spin-up during
> system resume.  Or you could disable runtime PM for the disk, but that
> has its own disadvantages.

Isn't immediate spin-up trivial to implement from anywhere?  I'm not
sure whether we'll end up defaulting to the lazy behavior or not but
if we do requiring userland to echo something to sysfs to configure
immediate spin-up feels a bit silly when userland might as well just
issue a dummy command to force spinup.

And, yes, I agree with Dan that avoiding spinup of harddrives on
system resume seems a bit niche in its usefulness.  suspend/resume
cycle at the very least generates logs which most likely will be
committed to the drive sooner or later.

What kind of use cases are we expecting for the lazy behavior?

Thanks.

-- 
tejun

  reply	other threads:[~2014-01-17 20:24 UTC|newest]

Thread overview: 165+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-17 19:33 [PATCH/RESEND v2 0/2] SATA disk resume time optimization Todd E Brandt
2013-11-07  1:53 ` Phillip Susi
2013-11-07  1:57   ` [PATCH 1/3] sd: don't bother spinning up disks on resume Phillip Susi
2013-11-07 18:21     ` Douglas Gilbert
2013-11-07 21:16       ` Phillip Susi
2013-11-16 18:20         ` James Bottomley
2013-11-17  3:50           ` Phillip Susi
2013-11-17  6:43             ` James Bottomley
2013-11-17 16:15               ` Phillip Susi
2013-11-17 23:54                 ` Douglas Gilbert
2013-11-18  1:06                   ` Phillip Susi
2013-11-18 15:54                     ` Phillip Susi
2013-11-20 14:23                       ` Mark Lord
2013-11-20 14:48                         ` Phillip Susi
2013-11-28  1:39                           ` Phillip Susi
2013-11-18  0:09                 ` James Bottomley
2013-11-18  1:11                   ` Phillip Susi
2013-11-16  5:23       ` Mark Lord
2013-11-16 14:52         ` Phillip Susi
2013-11-07  1:57   ` [PATCH 2/3] libata: resume in the background Phillip Susi
2013-11-07  1:57   ` [PATCH 3/3] libata: don't start disks on resume Phillip Susi
2013-11-09  1:20   ` [PATCH/RESEND v2 0/2] SATA disk resume time optimization Todd E Brandt
2013-11-09 20:59     ` Phillip Susi
2013-11-09 21:03       ` [PATCH 0/6] Let sleeping disks lie Phillip Susi
2013-12-16 23:30         ` Phillip Susi
2013-12-16 23:30           ` [PATCH 1/6] libata: use sleep instead of standby command Phillip Susi
2013-12-16 23:30           ` [PATCH 2/6] libata: avoid waking disk for several commands Phillip Susi
2013-12-16 23:30           ` [PATCH 3/6] libata: resume in the background Phillip Susi
2014-01-10 22:26             ` Dan Williams
2014-01-11  2:25               ` Phillip Susi
2014-01-11  3:11                 ` Dan Williams
2013-12-16 23:30           ` [PATCH 4/6] libata: don't start disks on resume Phillip Susi
2013-12-16 23:30           ` [PATCH 5/6] sd: don't start disks on system resume Phillip Susi
2013-12-17  6:43             ` James Bottomley
2013-12-17 15:01               ` Phillip Susi
2013-12-17 17:48                 ` James Bottomley
2013-12-17 18:30                   ` Phillip Susi
2013-12-16 23:30           ` [PATCH 6/6] libata: return power status in REQUEST SENSE command Phillip Susi
2013-12-17 18:02             ` Sergei Shtylyov
2013-12-17 18:35               ` Phillip Susi
2014-01-06  2:14           ` REQ_PM vs REQ_TYPE_PM_RESUME Phillip Susi
2014-01-06  7:36             ` Sujit Reddy Thumma
2014-01-06  9:15               ` Aaron Lu
2014-01-06 14:40                 ` Phillip Susi
2014-01-06 15:38                   ` Alan Stern
2014-01-07  2:44                     ` Phillip Susi
2014-01-07 15:20                       ` Alan Stern
2014-01-07 15:40                         ` Phillip Susi
2014-01-07 15:56                           ` Alan Stern
2014-01-09 18:29                           ` Douglas Gilbert
2014-01-09 19:20                             ` Phillip Susi
2014-01-10  5:23                               ` Douglas Gilbert
2014-01-10 14:29                                 ` Phillip Susi
2014-01-07  7:49                   ` Aaron Lu
2014-01-07 14:50                     ` Phillip Susi
2014-01-08  1:03                       ` Aaron Lu
2014-01-08  1:16                         ` Phillip Susi
2014-01-08  1:32                           ` Aaron Lu
2014-01-08  1:53                             ` Phillip Susi
2014-01-08  2:11                               ` Aaron Lu
2014-01-08  2:19                                 ` Phillip Susi
2014-01-08  2:36                                   ` Aaron Lu
2014-01-08  5:24                                     ` Phillip Susi
2014-01-08  7:00                                       ` Aaron Lu
2014-01-08 19:30                                         ` Phillip Susi
2014-01-07 15:25                     ` Alan Stern
2014-01-07 15:43                       ` Phillip Susi
2014-01-07 16:08                         ` Alan Stern
2014-01-07 16:37                           ` Phillip Susi
2014-01-07 18:05                             ` Alan Stern
2014-01-07 18:43                               ` Phillip Susi
2014-01-07 19:18                                 ` Alan Stern
2014-01-07 23:47                                   ` Phillip Susi
2014-01-08 17:46                                     ` Alan Stern
2014-01-08 18:31                                       ` Alan Stern
2014-01-08 20:44                                         ` Allow runtime suspend during system resume Alan Stern
2014-01-08 21:17                                           ` Phillip Susi
2014-01-08 21:34                                             ` Alan Stern
2014-01-09 10:14                                               ` Ulf Hansson
2014-01-09 15:41                                                 ` Alan Stern
2014-01-08 22:55                                           ` Rafael J. Wysocki
2014-01-08 23:24                                             ` Alan Stern
2014-01-09  0:05                                               ` Rafael J. Wysocki
2014-01-09 15:32                                                 ` Alan Stern
2014-01-09 15:50                                                   ` Phillip Susi
2014-01-09 16:08                                                     ` Alan Stern
2014-01-09 16:30                                                       ` Phillip Susi
2014-01-09 17:04                                                         ` Alan Stern
2014-01-10  1:25                                                   ` Rafael J. Wysocki
2014-01-10  1:55                                                     ` Phillip Susi
2014-01-10 13:35                                                       ` Rafael J. Wysocki
2014-01-10 14:46                                                         ` Phillip Susi
2014-01-10 15:25                                                     ` Alan Stern
2014-01-10 23:02                                                       ` Rafael J. Wysocki
2014-01-11  2:08                                                         ` Phillip Susi
2014-01-11 22:50                                                           ` Alan Stern
2014-01-12  1:50                                                             ` Phillip Susi
2014-01-11 22:34                                                         ` Alan Stern
2014-01-08 20:20                                       ` REQ_PM vs REQ_TYPE_PM_RESUME Phillip Susi
2014-01-08 21:21                                         ` Alan Stern
2014-01-08 21:50                                           ` Phillip Susi
2014-01-09  1:29                                           ` Aaron Lu
2014-01-09 12:17                                             ` Rafael J. Wysocki
2014-01-09 13:18                                               ` Rafael J. Wysocki
2014-01-09 15:40                                             ` Alan Stern
2014-01-09 15:53                                               ` Phillip Susi
2014-01-09 16:14                                                 ` Alan Stern
2014-01-09 16:34                                                   ` Phillip Susi
2014-01-09 17:06                                                     ` Alan Stern
2014-01-16 16:59                                                 ` Disk spin-up optimization during system resume Alan Stern
2014-01-16 18:04                                                   ` Todd E Brandt
2014-01-16 18:33                                                     ` Phillip Susi
2014-01-16 20:05                                                     ` Alan Stern
2014-01-16 22:04                                                       ` Todd E Brandt
2014-01-17 14:57                                                         ` Alan Stern
2014-01-17 19:31                                                           ` Dan Williams
2014-01-17 20:15                                                             ` Alan Stern
2014-01-17 20:24                                                               ` Tejun Heo [this message]
2014-01-17 20:55                                                                 ` Phillip Susi
2014-01-18 14:04                                                                   ` Tejun Heo
2014-01-18  1:36                                                                 ` Todd E Brandt
2014-01-18  1:41                                                                 ` Alan Stern
2014-01-18  2:15                                                                   ` Dan Williams
2014-01-18  2:33                                                                     ` Alan Stern
2014-01-18  3:24                                                                   ` Phillip Susi
2014-01-18 13:59                                                                   ` Tejun Heo
2014-01-17 20:49                                                             ` Phillip Susi
2014-01-17 22:17                                                               ` Dan Williams
2014-01-18  3:18                                                                 ` Phillip Susi
2014-01-18  4:09                                                                   ` Dan Williams
2014-01-18 14:08                                                                     ` Alan Stern
2014-01-21 10:12                                                                       ` Dan Williams
2014-01-21 14:37                                                                         ` Phillip Susi
2014-01-21 16:03                                                                           ` Alan Stern
2014-01-21 16:18                                                                             ` Phillip Susi
2014-01-21 16:49                                                                               ` Alan Stern
2014-01-21 15:44                                                                         ` Alan Stern
2014-01-21 16:18                                                                           ` Dan Williams
2014-01-21 16:55                                                                             ` Dan Williams
2014-01-20 12:38                                                                     ` CrashPlan Pro
2014-01-20 14:30                                                                       ` Phillip Susi
2014-01-18  1:24                                                           ` Todd E Brandt
2014-01-18  3:20                                                             ` Phillip Susi
2014-01-16 18:39                                                   ` Phillip Susi
2014-01-16 20:08                                                     ` Alan Stern
2014-01-17 10:16                                                   ` Oliver Neukum
2014-01-17 10:21                                                     ` Tejun Heo
2014-01-17 18:18                                                       ` Alan Stern
2014-01-17 18:39                                                       ` James Bottomley
2014-01-17 19:07                                                         ` Tejun Heo
2013-11-09 21:03       ` [PATCH 1/6] libata: use sleep instead of standby command Phillip Susi
2013-11-09 21:03       ` [PATCH 2/6] libata: avoid waking disk to check power Phillip Susi
2013-11-11 13:05         ` Sergei Shtylyov
2013-11-09 21:03       ` [PATCH 3/6] sd: don't bother spinning up disks on resume Phillip Susi
2013-11-11 13:08         ` Sergei Shtylyov
2013-11-11 14:28           ` Phillip Susi
2013-11-09 21:03       ` [PATCH 4/6] libata: resume in the background Phillip Susi
2013-11-11 13:10         ` Sergei Shtylyov
2013-11-09 21:03       ` [PATCH 5/6] libata: don't start disks on resume Phillip Susi
2013-11-09 21:03       ` [PATCH 6/6] libata: fake some more commands when drive is sleeping Phillip Susi
2013-11-11 16:59       ` [PATCH/RESEND v2 0/2] SATA disk resume time optimization Todd E Brandt
2013-11-11 17:08         ` Phillip Susi
2013-12-17 12:15           ` Tejun Heo
2013-12-17 14:24             ` Phillip Susi
2013-11-27 16:18 ` Phillip Susi

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