55 lines
1.8 KiB
Text
55 lines
1.8 KiB
Text
. /usr/share/misc/source_deviceinfo
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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.com/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 [ "$deviceinfo_zram_swap_pct" == "0" ]; then
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echo "zram swap: disabled in deviceinfo, exiting"
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exit 0
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fi
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_size_pct="$deviceinfo_zram_swap_pct"
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fi
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size0=$(($_mem_size_mb * $_size_pct / 100))
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echo "zram swap: activating with size: $size0 MB"
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# zstd (since linux-4.18), lz4 (since linux-3.15), or lzo.
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# Size: zstd (best) > lzo > lz4. Speed: lz4 (best) > zstd > lzo
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algo0=zstd
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# The following are defaults from the zram-init package:
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load_on_start=yes
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unload_on_stop=yes
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num_devices=1
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type0=swap
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flag0= # The default "16383" is fine for us
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mlim0= # no hard memory limit
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back0= # no backup device
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icmp0= # no incompressible page writing to backup device
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idle0= # no idle page writing to backup device
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wlim0= # no writeback_limit for idle page writing for backup device
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notr0= # keep the default on linux-3.15 or newer
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maxs0=1 # maximum number of parallel processes for this device
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labl0=zram_swap # the label name
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uuid0= # Do not force UUID
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args0= # we could e.g. have set args0="-L 'zram_swap'" instead of using labl0
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