Public bug reported:
Microsoft would like to request the following upstream commit in all
releases supported on Azure. This commit improves a signification delay
in hibernation/resume:
55c4478a8f0e("PM: hibernate: Batch hibernate and resume IO requests")
Details of this commit:
Hibernate and resume process submits individual IO requests for each page of
the data, so use blk_plug to improve the batching of these requests.
Testing this change with hibernate and resumes consistently shows
merging of the IO requests and more than an order of magnitude
improvement in hibernate and resume speed is observed.
One hibernate and resume cycle for 16GB RAM out of 32GB in use takes
around 21 minutes before the change, and 1 minutes after the change on a
system with limited storage IOPS.
** Affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1904458
Title:
[linux-azure] Batch hibernate and resume IO requests
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