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nixos/zram: add zramSwap.memoryMax option
This allows capping the total amount of memory that will be used for zram-swap, in addition to the percentage-based calculation, which is useful when blanket-applying a configuration to many machines. This is based off the strategy used by Fedora for their rollout of zram-swap-by-default in Fedora 33 (https://fedoraproject.org/wiki/Changes/SwapOnZRAM), which caps the maximum amount of memory used for zram at 4GiB. In future it might be good to port this to the systemd zram-generator, instead of using this separate infrastructure.
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@ -80,6 +80,15 @@ in
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'';
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};
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memoryMax = mkOption {
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default = null;
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type = with types; nullOr int;
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description = ''
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Maximum total amount of memory (in bytes) that can be used by the zram
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swap devices.
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'';
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};
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priority = mkOption {
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default = 5;
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type = types.int;
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@ -146,7 +155,12 @@ in
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# Calculate memory to use for zram
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mem=$(${pkgs.gawk}/bin/awk '/MemTotal: / {
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print int($2*${toString cfg.memoryPercent}/100.0/${toString devicesCount}*1024)
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value=int($2*${toString cfg.memoryPercent}/100.0/${toString devicesCount}*1024);
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${lib.optionalString (cfg.memoryMax != null) ''
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memory_max=int(${toString cfg.memoryMax}/${toString devicesCount});
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if (value > memory_max) { value = memory_max }
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''}
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print value
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}' /proc/meminfo)
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${pkgs.util-linux}/sbin/zramctl --size $mem --algorithm ${cfg.algorithm} /dev/${dev}
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