ACK/Cmnt: [SRU][D / B aws-edge][aws][PULL] proper hibernation support

[Stefan Bader]

On 16.01.20 15:34, Andrea Righi wrote:
> BugLink: https://bugs.launchpad.net/bugs/1858618
> BugLink: https://bugs.launchpad.net/bugs/1831940
> 
> The following patches are required to properly support hibernation with
> bionic:linux-aws-edge / disco:linux-aws.
> 
> The most important patch is "PM / hibernate: memory_bm_find_bit():
> Tighten node optimisation": this is a very critical bug fix for
> hibernation that prevents potential memory corruptions on resume.
> 
> The two SAUCE patches are required to improve swapoff performance after
> a successful resume.
> 
> All these patches have been tested in the AWS environment with positive
> results.
> 
> The following changes since commit 0f84693e79c7c596ac56d952851e0b9527679689:
> 
>   UBUNTU: Ubuntu-aws-edge-5.0.0-1019.21~18.04.1 (2019-10-03 00:49:16 -0400)
> 
> are available in the Git repository at:
> 
>   git://git.launchpad.net/~arighi/+git/bionic-linux aws-edge-arighi
> 
> for you to fetch changes up to 65f789bf0216b2daf6377c2ba51d94cb8b76e5e1:
> 
>   UBUNTU SAUCE [aws]: mm: swap: improve swap readahead heuristic (2020-01-16 15:19:46 +0100)
> 
> ----------------------------------------------------------------
> Andrea Righi (2):
>       UBUNTU SAUCE [aws] PM / hibernate: reduce memory pressure during image writing
>       UBUNTU SAUCE [aws]: mm: swap: improve swap readahead heuristic
> 
> Andy Whitcroft (1):
>       PM / hibernate: memory_bm_find_bit(): Tighten node optimisation
> 
> Vineeth Remanan Pillai (2):
>       mm: refactor swap-in logic out of shmem_getpage_gfp
>       mm: rid swapoff of quadratic complexity
> 
>  include/linux/frontswap.h |   7 +
>  include/linux/shmem_fs.h  |   3 +-
>  kernel/power/snapshot.c   |   9 +-
>  kernel/power/swap.c       |  24 +-
>  mm/shmem.c                | 716 +++++++++++++++++++++++++---------------------
>  mm/swap.c                 |   2 +-
>  mm/swap_state.c           |  60 +---
>  mm/swapfile.c             | 433 +++++++++++-----------------
>  8 files changed, 582 insertions(+), 672 deletions(-)
> 

Just to clarify: this seems very much targeted towards AWS, so I would put it
either into d/aws or (more likely the better place at this time) b/aws-5.0

Acked-by: Stefan Bader <stefan.bader at canonical.com>

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