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swap: support swapDevices.*.discardPolicy option

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Giel van Schijndel 2024-05-06 00:10:38 +02:00
parent e1b3ae2b4e
commit 8a02c0507c
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2 changed files with 19 additions and 2 deletions
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1
example/swap.nix
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@ -35,6 +35,7 @@
size = "100%";
content = {
type = "swap";
discardPolicy = "both";
resumeDevice = true; # resume from hiberation from this device
};
};

20
lib/types/swap.nix
View File

@ -11,6 +11,18 @@
default = device;
description = "Device";
};
discardPolicy = lib.mkOption {
default = null;
example = "once";
type = lib.types.nullOr (lib.types.enum [ "once" "pages" "both" ]);
description = lib.mdDoc ''
Specify the discard policy for the swap device. If "once", then the
whole swap space is discarded at swapon invocation. If "pages",
asynchronous discard on freed pages is performed, before returning to
the available pages pool. With "both", both policies are activated.
See swapon(8) for more information.
'';
};
extraArgs = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = [ ];
@ -53,7 +65,11 @@
default = lib.optionalAttrs (!config.randomEncryption) {
fs.${config.device} = ''
if ! swapon --show | grep -q "^$(readlink -f ${config.device}) "; then
swapon ${config.device}
swapon ${
lib.optionalString (config.discardPolicy != null)
"--discard${lib.optionalString (config.discardPolicy != "both")
"=${config.discardPolicy}"
}"} ${config.device}
fi
'';
};
@ -64,7 +80,7 @@
default = [{
swapDevices = [{
device = config.device;
randomEncryption = config.randomEncryption;
inherit (config) discardPolicy randomEncryption;
}];
boot.resumeDevice = lib.mkIf config.resumeDevice config.device;
}];