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Merge pull request #102855 from lukegb/zram-cap-max

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nixos/zram: add zramSwap.memoryMax option
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Linus Heckemann 2020-11-25 14:46:39 +01:00 committed by GitHub
commit de3ea5ac12
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1 changed files with 15 additions and 1 deletions
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16
nixos/modules/config/zram.nix
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@ -80,6 +80,15 @@ in
'';
};
memoryMax = mkOption {
default = null;
type = with types; nullOr int;
description = ''
Maximum total amount of memory (in bytes) that can be used by the zram
swap devices.
'';
};
priority = mkOption {
default = 5;
type = types.int;
@ -146,7 +155,12 @@ in
# Calculate memory to use for zram
mem=$(${pkgs.gawk}/bin/awk '/MemTotal: / {
print int($2*${toString cfg.memoryPercent}/100.0/${toString devicesCount}*1024)
value=int($2*${toString cfg.memoryPercent}/100.0/${toString devicesCount}*1024);
${lib.optionalString (cfg.memoryMax != null) ''
memory_max=int(${toString cfg.memoryMax}/${toString devicesCount});
if (value > memory_max) { value = memory_max }
''}
print value
}' /proc/meminfo)
${pkgs.util-linux}/sbin/zramctl --size $mem --algorithm ${cfg.algorithm} /dev/${dev}