Public bug reported:

From: Aleksei Besogonov <[email protected]>

PM / hibernate: Speed up hibernation by batching requests

Hibernate file reading and writing submits individual IO requests for
each page of the data. This normally is not a big issue, however some
cloud computing providers meter IO by the number of requests and not by
their size. So one 4KB request counts as much as a 256KB request
towards the IOPS quota.

With this patch we opportunistically batch the requests together,
increasing performance by 20-30%.

** Affects: linux-aws (Ubuntu)
     Importance: Undecided
     Assignee: Kamal Mostafa (kamalmostafa)
         Status: Triaged

** Affects: linux-aws (Ubuntu Xenial)
     Importance: Undecided
     Assignee: Kamal Mostafa (kamalmostafa)
         Status: In Progress

** Affects: linux-aws (Ubuntu Bionic)
     Importance: Undecided
     Assignee: Kamal Mostafa (kamalmostafa)
         Status: In Progress

** Affects: linux-aws (Ubuntu Cosmic)
     Importance: Undecided
     Assignee: Kamal Mostafa (kamalmostafa)
         Status: In Progress

** Affects: linux-aws (Ubuntu Disco)
     Importance: Undecided
     Assignee: Kamal Mostafa (kamalmostafa)
         Status: Triaged

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https://bugs.launchpad.net/bugs/1803613

Title:
  Improve AWS hibernation performance

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