Re: [RFC 2/6] PM: Hibernate: Add option to disable disk offset randomization
From: Randy Dunlap <hidden>
Date: 2022-05-23 20:50:20
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linux-block, linux-doc, linux-mm, linux-pm, lkml
On 5/18/22 00:48, Vivek Kumar wrote:
quoted hunk ↗ jump to hunk
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 <redacted> Signed-off-by: Prasanna Kumar <redacted> --- 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=
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