Re: [RFC 2/6] PM: Hibernate: Add option to disable disk offset randomization

[Randy Dunlap]

On 5/18/22 00:48, Vivek Kumar wrote:
> Add a kernel parameter to disable the disk offset randomization
> for SSD devices in which such feature is available at the
> firmware level. This is helpful in improving hibernation
> resume time.
> 
> Signed-off-by: Vivek Kumar <quic_vivekuma@xxxxxxxxxxx>
> Signed-off-by: Prasanna Kumar <quic_kprasan@xxxxxxxxxxx>
> ---
>  Documentation/admin-guide/kernel-parameters.txt | 11 +++++++++++
>  kernel/power/swap.c                             |  9 +++++++++
>  2 files changed, 20 insertions(+)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 666ade9..06b4f10 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -5192,6 +5192,17 @@
>  			Useful for devices that are detected asynchronously
>  			(e.g. USB and MMC devices).
>  
> +	noswap_randomize
> +			Kernel uses random disk offsets to help with wear-levelling

			                                             wear-leveling

> +			of SSD devices, while saving the hibernation snapshot image to
> +			disk. Use this parameter to disable this feature for SSD
> +			devices in scenarios when, such randomization is addressed at

			               no comma  ^

> +			the firmware level and hibenration image is not re-generated

			                       hibernation

> +			frequently.
> +			(Useful for improving hibernation resume time as snapshot pages
> +			are available in disk serially and can be read in bigger chunks
> +			without seeking)
> +
>  	retain_initrd	[RAM] Keep initrd memory after extraction
>  
>  	rfkill.default_state=


-- 
~Randy