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PM: Hibernate: Add option to disable disk offset randomization

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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.

Change-Id: Ic1739bf63ad8cf3e71500e12552d4382da617341
Signed-off-by: Vivek Kumar <vivekuma@codeaurora.org>
This commit is contained in:
Vivek Kumar 2019-06-18 12:20:37 +05:30 committed by Gerrit - the friendly Code Review server
parent 495096f09e
commit ffd32d2baf
2 changed files with 20 additions and 0 deletions
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11
Documentation/admin-guide/kernel-parameters.txt
View File

@ -3800,6 +3800,17 @@
(that will set all pages holding image data
during restoration read-only).
noswap_randomize
Kernel uses random disk offsets to help with wear-levelling
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
the firmware level and hibenration image is not re-generated
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=

9
kernel/power/swap.c
View File

@ -43,6 +43,7 @@
*/
static bool clean_pages_on_read;
static bool clean_pages_on_decompress;
static bool noswap_randomize;
/*
* The swap map is a data structure used for keeping track of each page
@ -1620,3 +1621,11 @@ static int swsusp_header_init(void)
}
core_initcall(swsusp_header_init);
static int __init noswap_randomize_setup(char *str)
{
noswap_randomize = true;
return 1;
}
__setup("noswap_randomize", noswap_randomize_setup);