Replace uksmd with built-in KSM support in systemd #64
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ventureoo
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There is an alternative way to get the same thing uksmd does using systemd. This method will be described later. See: CachyOS/CachyOS-Settings#64
1Naim
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Jul 25, 2024
This reverts commit d4db4b7.
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systemd allows to use the same mechanism (kernel API) as uksmd using the
MemoryKSM=yesservice option. The idea is that we take the processes that are parent to most user processes like display managers (SDDM/GDM/LightMD/Ly/etc) or getty in case we don't have a display manager, and enableMemoryKSM=yesfor them, so that all child processes inherit the PR_SET_MEMORY_MERGE attribute, which gives ksmd a hint that the pages of this process can be merged. Unlike uksmd it allows us to:uksmdstill a necessary dependency forcachyos-settings? CachyOS-PKGBUILDS#203)I also put a new
ksmctlutility in these patches that allows you to disable ksmd right at runtime, in case debugging/regressions occur. Measurements and profits can be retrieved usingtopmem --sort ksm.Marked as a draft until systemd 256 is available in the repo, as it contains an important fix related to these changes.