d60f557c4a
Some devices would benefit from using compression algorithms besides zstd. Allow device maintainers to specify a more suitable algorithm using `zram_swap_algo` deviceinfo variable. Signed-off-By: Sicelo A. Mhlongo <absicsz@gmail.com> Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7239>
49 lines
1.5 KiB
Text
49 lines
1.5 KiB
Text
. /usr/share/misc/source_deviceinfo
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[ $# -ne 1 ] && exit 1
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case "$1" in
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"size")
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# Size defaults to:
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# - 75% of RAM for devices with 2GB of RAM or less
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# - 50% of RAM for devices with between 2GB and 6GB of RAM
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# - 25% of RAM for devices with greater 6GB of RAM
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# This is loosely based on some data here:
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# https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/3752#note_1229631449
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_mem_size_mb="$(LC_ALL=C free -m | awk '/^Mem:/{print $2}')"
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if [ $_mem_size_mb -le 2048 ]; then
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_size_pct=75
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elif [ $_mem_size_mb -gt 6144 ]; then
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_size_pct=25
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else
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_size_pct=50
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fi
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# Allow overriding the size as a percentage of RAM using a deviceinfo var, or
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# disabling it completely
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if [ -n "$deviceinfo_zram_swap_pct" ]; then
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# 0% --> disable zram swap
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if [ "$deviceinfo_zram_swap_pct" == "0" ]; then
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echo 0
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exit 0
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fi
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_size_pct="$deviceinfo_zram_swap_pct"
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fi
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echo $(($_mem_size_mb * $_size_pct / 100))
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exit 0
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;;
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"algo")
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# Default to zstd compression, and allow overriding via deviceinfo
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# TODO: Ensure deviceinfo uses valid and usable algorithm
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echo "${deviceinfo_zram_swap_algo:-zstd}"
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exit 0
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;;
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*)
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exit 1
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;;
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esac
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