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

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Message-ID: <f99153be-2636-60a3-2630-c592cc230b53@infradead.org>
Date:   Mon, 23 May 2022 13:49:38 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Vivek Kumar <quic_vivekuma@...cinc.com>, corbet@....net,
        catalin.marinas@....com, will@...nel.org, tglx@...utronix.de,
        maz@...nel.org, axboe@...nel.dk, rafael@...nel.org,
        akpm@...ux-foundation.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-mm@...ck.org
Cc:     len.brown@...el.com, pavel@....cz, paulmck@...nel.org, bp@...e.de,
        keescook@...omium.org, songmuchun@...edance.com,
        damien.lemoal@...nsource.wdc.com, pasha.tatashin@...een.com,
        tabba@...gle.com, ardb@...nel.org, tsoni@...cinc.com,
        quic_psodagud@...cinc.com, quic_svaddagi@...cinc.com,
        Prasanna Kumar <quic_kprasan@...cinc.com>
Subject: Re: [RFC 2/6] PM: Hibernate: Add option to disable disk offset
 randomization



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@...cinc.com>
> Signed-off-by: Prasanna Kumar <quic_kprasan@...cinc.com>
> ---
>  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