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Date: Sat, 23 Mar 2013 11:37:13 +0800 From: Aaron Lu <aaron.lu@...el.com> To: Jens Axboe <axboe@...nel.dk> CC: Alan Stern <stern@...land.harvard.edu>, "Rafael J. Wysocki" <rjw@...k.pl>, James Bottomley <James.Bottomley@...senpartnership.com>, Tejun Heo <tj@...nel.org>, linux-pm@...r.kernel.org, linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org, Aaron Lu <aaron.lwe@...il.com>, Shane Huang <shane.huang@....com>, Oliver Neukum <oneukum@...e.de> Subject: Re: [PATCH RESEND v11 0/4] block layer runtime pm On 03/22/2013 11:09 PM, Jens Axboe wrote: > On Fri, Mar 15 2013, Aaron Lu wrote: >> In August 2010, Jens and Alan discussed about "Runtime PM and the block >> layer". http://marc.info/?t=128259108400001&r=1&w=2 >> And then Alan has given a detailed implementation guide: >> http://marc.info/?l=linux-scsi&m=133727953625963&w=2 >> >> To test: >> # ls -l /sys/block/sda >> /sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/block/sda >> >> # echo 10000 > /sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/power/autosuspend_delay_ms >> # echo auto > /sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/power/control >> Then you'll see sda is suspended after 10secs idle. >> >> [ 1767.680192] sd 2:0:0:0: [sda] Synchronizing SCSI cache >> [ 1767.680317] sd 2:0:0:0: [sda] Stopping disk >> >> And if you do some IO, it will resume immediately. >> [ 1791.052438] sd 2:0:0:0: [sda] Starting disk >> >> For test, I often set the autosuspend time to 1 second. If you are using >> a GUI, the 10 seconds delay may be too long that the disk can not enter >> runtime suspended state. >> >> Note that sd's runtime suspend callback will dump some kernel messages >> and the syslog daemon will write kernel message to /var/log/messages, >> making the disk instantly resume after suspended. So for test, the >> syslog daemon should better be temporarily stopped. >> >> A git repo for it, on top of v3.9-rc1: >> https://github.com/aaronlu/linux.git blockpm > > I think it's about time we get this in, but the patchset isn't very > friendly from a scsi vs block perspective. Can you re-shuffle the REQ_PM > change, just do a separate patch for that. I'll get it queued up for > 3.10 then. Thanks Jens. I'll spilt the first patch into two patches: one to introduce the REQ_PM flag in block layer and one to use that flag in SCSI layer. Will send out v12 soon. Best regards, Aaron -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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