[PATCH] UBUNTU: [Config] Switch from DECOMP_SINGLE to DECOMP_MULTI_PERCPU

[Andrea Righi]

On Fri, Aug 26, 2022 at 03:31:28PM +0100, Dimitri John Ledkov wrote:
> BugLink: https://bugs.launchpad.net/bugs/1980861
> 
> Overall MULTI_PERCPU has similar or better performance on the wide
> range of instance types and squashfs filesystems.
> 
> Signed-off-by: Dimitri John Ledkov <dimitri.ledkov at canonical.com>

How about memory usage? Have we done any test to measure the memory
footprint after this change?

Considering that snap is using squashfs and snap is pretty much
everywhere nowdays, I was wondering if this change may trigger potential
OOM conditions in some small cloud instances that we support (i.e., on
AWS) or small systems in general.

Thanks,
-Andrea

> ---
>  debian.master/config/annotations          | 5 +++--
>  debian.master/config/config.common.ubuntu | 4 ++--
>  2 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/debian.master/config/annotations b/debian.master/config/annotations
> index 2e96b8206b..c28ef8ab47 100644
> --- a/debian.master/config/annotations
> +++ b/debian.master/config/annotations
> @@ -10848,9 +10848,10 @@ CONFIG_SQUASHFS_4K_DEVBLK_SIZE                  note<non-default block size>
>  CONFIG_SQUASHFS                                 mark<ENFORCED> note<LP: #1593134>
>  
>  # Menu: File systems >> Miscellaneous filesystems >> SquashFS 4.0 - Squashed file system support >> Decompressor parallelisation options
> -CONFIG_SQUASHFS_DECOMP_SINGLE                   policy<{'amd64': 'y', 'arm64': 'y', 'armhf': 'y', 'ppc64el': 'y', 'riscv64': 'y', 's390x': 'y'}>
> +CONFIG_SQUASHFS_DECOMP_SINGLE                   policy<{'amd64': 'n', 'arm64': 'n', 'armhf': 'n', 'ppc64el': 'n', 'riscv64': 'n', 's390x': 'n'}>
>  CONFIG_SQUASHFS_DECOMP_MULTI                    policy<{'amd64': 'n', 'arm64': 'n', 'armhf': 'n', 'ppc64el': 'n', 'riscv64': 'n', 's390x': 'n'}>
> -CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU             policy<{'amd64': 'n', 'arm64': 'n', 'armhf': 'n', 'ppc64el': 'n', 'riscv64': 'n', 's390x': 'n'}>
> +CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU             policy<{'amd64': 'y', 'arm64': 'y', 'armhf': 'y', 'ppc64el': 'y', 'riscv64': 'y', 's390x': 'y'}>
> +CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU             mark<ENFORCED> note<LP: #1980861>
>  
>  # Menu: File systems >> Miscellaneous filesystems >> SquashFS 4.0 - Squashed file system support >> File decompression options
>  CONFIG_SQUASHFS_FILE_CACHE                      policy<{'amd64': 'n', 'arm64': 'n', 'armhf': 'n', 'ppc64el': 'n', 'riscv64': 'n', 's390x': 'n'}>
> diff --git a/debian.master/config/config.common.ubuntu b/debian.master/config/config.common.ubuntu
> index c52f519868..cb3fc66a03 100644
> --- a/debian.master/config/config.common.ubuntu
> +++ b/debian.master/config/config.common.ubuntu
> @@ -11188,8 +11188,8 @@ CONFIG_SPS30_SERIAL=m
>  CONFIG_SQUASHFS=y
>  # CONFIG_SQUASHFS_4K_DEVBLK_SIZE is not set
>  # CONFIG_SQUASHFS_DECOMP_MULTI is not set
> -# CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU is not set
> -CONFIG_SQUASHFS_DECOMP_SINGLE=y
> +CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU=y
> +# CONFIG_SQUASHFS_DECOMP_SINGLE is not set
>  # CONFIG_SQUASHFS_EMBEDDED is not set
>  # CONFIG_SQUASHFS_FILE_CACHE is not set
>  CONFIG_SQUASHFS_FILE_DIRECT=y
> -- 
> 2.34.1
> 
> 
> -- 
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