From: Dan Williams <dan.j.williams@intel.com>
To: tj@kernel.org, JBottomley@Parallels.com
Cc: Len Brown <len.brown@intel.com>,
linux-scsi@vger.kernel.org, Phillip Susi <psusi@ubuntu.com>,
linux-ide@vger.kernel.org, Alan Stern <stern@rowland.harvard.edu>,
Todd Brandt <todd.e.brandt@linux.intel.com>,
Todd Brandt <todd.e.brandt@intel.com>
Subject: [PATCH v5 0/3] Accelerate Storage Resume (2x or more)
Date: Wed, 05 Mar 2014 12:17:24 -0800 [thread overview]
Message-ID: <20140305201443.20088.85361.stgit@viggo.jf.intel.com> (raw)
It is not everyday that a kernel operation gets 2x faster. Nice find
by Todd and his AnalyzeSuspend tool [1].
Todd is on vacation so I am taking care of these patches to make sure
they get in the queue for 3.15.
The significant changes from Todd's last submission [2]:
1/ Split out the pure cleanup into its own patch, and expand it to clean
up libsas as well
2/ Move the entirety of scsi_device resume to an async context. As
written, v4 of the patchset overlapped the scsi-start-stop command
with the scsi_device_resume(). Now in v5 the queue restart is
properly ordered with the completion of the scsi-start-stop command.
Resume completion time as reported by:
"echo devices > /sys/power/pm_test && echo mem > /sys/power/state"
BEFORE: PM: resume of devices complete after 2271.097 msecs
AFTER: PM: resume of devices complete after 1057.404 msecs
On a system with two SSDs attached via AHCI.
--
Dan
[1]: Todd's testing showing up to 12x resume latency improvement in some
cases:
https://01.org/suspendresume/blogs/tebrandt/2013/hard-disk-resume-optimization-simpler-approach
[2]: Todd's v4 patchset:
[PATCH v4 0/2] http://marc.info/?l=linux-ide&m=138984698103487&w=2
[PATCH v4 1/2] http://marc.info/?l=linux-ide&m=138984713203515&w=2
[PATCH v4 2/2] http://marc.info/?l=linux-ide&m=138984722003539&w=2
---
Dan Williams (2):
libata, libsas: kill pm_result and related cleanup
scsi: async sd resume
Todd Brandt (1):
libata: async resume
drivers/ata/libata-core.c | 75 ++++++++++-----------------
drivers/ata/libata-eh.c | 13 +----
drivers/scsi/libsas/sas_ata.c | 35 ++----------
drivers/scsi/scsi.c | 3 +
drivers/scsi/scsi_pm.c | 115 ++++++++++++++++++++++++++++++++---------
drivers/scsi/scsi_priv.h | 1
drivers/scsi/sd.c | 1
include/linux/libata.h | 9 +--
include/scsi/libsas.h | 1
9 files changed, 134 insertions(+), 119 deletions(-)
next reply other threads:[~2014-03-05 20:17 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-05 20:17 Dan Williams [this message]
2014-03-05 20:17 ` [PATCH v5 1/3] libata, libsas: kill pm_result and related cleanup Dan Williams
2014-03-10 20:29 ` Tejun Heo
2014-03-10 20:44 ` Tejun Heo
2014-03-05 20:17 ` [PATCH v5 2/3] libata: async resume Dan Williams
2014-12-19 23:46 ` Phillip Susi
2014-12-20 1:42 ` Phillip Susi
2014-03-05 20:17 ` [PATCH v5 3/3] scsi: async sd resume Dan Williams
2014-03-07 15:42 ` Alan Stern
2014-03-08 0:41 ` Dan Williams
2014-03-08 2:52 ` Dan Williams
2014-03-10 15:49 ` Alan Stern
2014-03-10 20:43 ` Tejun Heo
2014-03-10 20:56 ` Dan Williams
2014-03-10 20:59 ` Alan Stern
2014-03-10 21:06 ` Dan Williams
2014-03-10 22:41 ` Phillip Susi
2014-03-11 4:19 ` James Bottomley
2014-03-11 4:47 ` Dan Williams
2014-03-11 5:16 ` James Bottomley
2014-03-11 5:26 ` Dan Williams
2014-03-11 6:29 ` James Bottomley
2014-03-14 20:11 ` Dan Williams
2014-03-15 21:47 ` James Bottomley
2014-03-15 23:35 ` Dan Williams
2014-03-16 18:21 ` James Bottomley
2014-03-17 18:20 ` Dan Williams
2014-03-21 0:09 ` Dan Williams
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