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nixos/boot/tmp: introduce adaptive huge memory pages (#404514)

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Martin Weinelt 2025-05-11 01:23:32 +02:00 • committed by GitHub
commit 9da9474d63
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18
nixos/modules/system/boot/tmp.nix
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@ -31,6 +31,23 @@ in
'';
};
tmpfsHugeMemoryPages = lib.mkOption {
type = lib.types.enum [
"never"
"always"
"within_size"
"advise"
];
default = "never";
example = "within_size";
description = ''
never - Do not allocate huge memory pages. This is the default.
always - Attempt to allocate huge memory page every time a new page is needed.
within_size - Only allocate huge memory pages if it will be fully within i_size. Also respect madvise(2) hints. Recommended.
advise - Only allocate huge memory pages if requested with madvise(2).
'';
};
useTmpfs = lib.mkOption {
type = lib.types.bool;
default = false;
@ -60,6 +77,7 @@ in
"nosuid"
"nodev"
"size=${toString cfg.tmpfsSize}"
"huge=${cfg.tmpfsHugeMemoryPages}"
];
}
];