From: Ming Lei <ming.lei@redhat.com>
To: Bart Van Assche <Bart.VanAssche@wdc.com>
Cc: "hch@lst.de" <hch@lst.de>,
"jthumshirn@suse.de" <jthumshirn@suse.de>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
"martin.petersen@oracle.com" <martin.petersen@oracle.com>,
"hare@suse.de" <hare@suse.de>,
"axboe@kernel.dk" <axboe@kernel.dk>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
"rjw@rjwysocki.net" <rjw@rjwysocki.net>,
"stern@rowland.harvard.edu" <stern@rowland.harvard.edu>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"jejb@linux.vnet.ibm.com" <jejb@linux.vnet.ibm.com>,
"adrian.hunter@intel.com" <adrian.hunter@intel.com>
Subject: Re: [PATCH RFC V2 3/3] scsi_mq: enable runtime PM
Date: Tue, 17 Jul 2018 23:38:53 +0800 [thread overview]
Message-ID: <20180717153847.GB8973@ming.t460p> (raw)
In-Reply-To: <07874eaab2d93728afe3f220cd0efa8f41d4955a.camel@wdc.com>
On Tue, Jul 17, 2018 at 03:34:35PM +0000, Bart Van Assche wrote:
> On Tue, 2018-07-17 at 23:30 +0800, Ming Lei wrote:
> > On Tue, Jul 17, 2018 at 03:24:11PM +0200, Christoph Hellwig wrote:
> > > On Fri, Jul 13, 2018 at 04:06:02PM +0800, Ming Lei wrote:
> > > > Usually SCSI supports runtime PM, so pass BLK_MQ_F_SUPPORT_RPM to blk-mq
> > > > core for enabling block runtime PM.
> > >
> > > I still think enabling this unconditionally for any SCSI device was
> > > a mistake, and it is even more so for blk-mq.
> > >
> > > Please only opt in for ufs, ATA first, adding others if wanted by
> > > maintainers.
> >
> > No, this way will cause regression because runtime PM works for
> > all sd/sr device actually, and it isn't related with scsi host.
>
> For which SCSI devices other than ufs and ATA do we need PM support?
As I said, it is any sd/sr device, which can be put down by runtime PM
via START_STOP command if it isn't used for a while.
Thanks,
Ming
next prev parent reply other threads:[~2018-07-17 15:38 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-13 8:05 [PATCH RFC V2 0/3] blk-mq: support runtime PM Ming Lei
2018-07-13 8:06 ` [PATCH RFC V2 1/3] block: put runtime PM code into common helpers Ming Lei
2018-07-17 13:21 ` Christoph Hellwig
2018-07-13 8:06 ` [PATCH RFC V2 2/3] blk-mq: prepare for supporting runtime PM Ming Lei
2018-07-13 20:16 ` Alan Stern
2018-07-17 13:23 ` Christoph Hellwig
2018-07-13 8:06 ` [PATCH RFC V2 3/3] scsi_mq: enable " Ming Lei
2018-07-17 13:24 ` Christoph Hellwig
2018-07-17 15:30 ` Ming Lei
2018-07-17 15:34 ` Bart Van Assche
2018-07-17 15:38 ` Ming Lei [this message]
2018-07-17 19:50 ` hch
2018-07-17 20:54 ` Alan Stern
2018-07-17 21:49 ` Jens Axboe
2018-07-18 12:06 ` Ming Lei
2018-07-18 12:28 ` Johannes Thumshirn
2018-07-18 12:37 ` Ming Lei
2018-07-18 14:12 ` Alan Stern
2018-07-18 14:18 ` Johannes Thumshirn
2018-07-18 15:01 ` Alan Stern
2018-07-19 6:41 ` Johannes Thumshirn
2018-07-19 14:35 ` Alan Stern
2018-07-19 14:43 ` Johannes Thumshirn
2018-07-18 14:50 ` Jens Axboe
2018-07-18 18:46 ` Alan Stern
2018-07-18 23:08 ` Ming Lei
2018-07-18 12:43 ` Hannes Reinecke
2018-07-18 13:05 ` Ming Lei
2018-07-13 14:21 ` [PATCH RFC V2 0/3] blk-mq: support " Jens Axboe
2018-07-14 2:37 ` Ming Lei
2018-07-14 2:54 ` Jens Axboe
2018-07-16 16:21 ` Bart Van Assche
2018-07-16 16:03 ` Bart Van Assche
2018-07-17 1:12 ` Ming Lei
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