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Author SHA1 Message Date
Luke Granger-Brown ad62155cb6 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.
2020-11-25 13:43:38 +00:00
Graham Christensen bc49a0815a
utillinux: rename to util-linux 2020-11-24 12:42:06 -05:00
zowoq f4852591c1
nixos/zram: make zstd the default (#87917) 2020-05-21 21:30:03 +03:00
Danylo Hlynskyi ef1911d045 zram: revert "change default algorithm to zstd" (#56856)
19.03 default kernel is still 4.14, which doesn't support zstd. So,
zramSwap in current fasion fails on default kernel.
2019-03-07 02:11:20 +02:00
danbst 34a764ce87 zramSwap: remove basic.target for zram devices
This creates a dependency cycle when used with boot.tmpOnTmpfs:
basic.target <- tmp.mount <- swap.target <- zram-init-dev0 <- basic.target

This same fix is done already for tmp.mount

Fixes https://github.com/NixOS/nixpkgs/issues/47474
2019-01-17 21:18:45 +02:00
danbst 8d8a7210e4 zramSwap: allow configure compression algorithm + cleanups
- add `zramSwap.algorithm` option, which allows to change compressor
declaratively. zstd as default
- add `zramSwap.swapDevices` option, which allows to define how many zram
devices will be used as swap. Rest devices can be managed freely
- simpler floating calculations
- fix udev race condition
- some documentation changes
- replaced `/sys/block/zram*` handling with `zramctl`, because I had occasional
"Device is busy" error (looks like zram has to be configured in predefined order)
- added `memoryPercent` and `algorithm` as restart triggers. I think, it was
a bug that changing `memoryPercent` in configuration wasn't applied immediately.
- removed a bind to .swap device. While it looks natural (when swap device goes
off, so should zram device), it wasn't implemented properly. This caused problems
with swapon/swapoff:
```
$ cat /proc/swaps
Filename                                Type            Size    Used    Priority
/dev/zram0                              partition       8166024 0       -2
/var/swapfile                           file            5119996 5120    1

$ sudo swapoff -a

$ sudo swapon -a
swapon: /dev/zram0: read swap header failed

$ cat /proc/swaps
Filename                                Type            Size    Used    Priority
/var/swapfile                           file            5119996 0       1
```
2019-01-17 15:58:53 +02:00
Wout Mertens 8e3a14549f
zramSwap: remove mentions of old kernels 2018-04-19 16:53:40 +02:00
Wout Mertens dd5e2a08fb
zramSwap: default to 1 device
One device per cpu is only needed for kernel 3.14
2018-04-19 16:44:08 +02:00
Shea Levy fec543436d
nixos: Move uses of stdenv.shell to runtimeShell. 2018-03-01 14:38:53 -05:00
Nikolay Amiantov 5ff6e98486 modprobe service: drop kmod wrapper 2016-08-19 17:56:49 +03:00
Shea Levy 9adad8612b Revert "Merge branch 'modprobe-fix' of git://github.com/abbradar/nixpkgs"
Was meant to go into staging, sorry

This reverts commit 57b2d1e9b0, reversing
changes made to 760b2b9048.
2016-08-15 19:05:52 -04:00
Nikolay Amiantov b2ebecd9e5 modprobe service: drop kmod wrapper 2016-08-16 00:19:25 +03:00
Roger Qiu 5d3b1b84f5 zram: simplified totalmem calculation for zram.nix 2016-01-29 22:41:20 +11:00
Ricardo M. Correia cd1b48bc35 nixos: Add zram swap module
This allows you to use the Linux kernel's built-in compressed memory as
swap space functionality.

It is recommended to enable only for kernel 3.14 (which is when zram came out of
the staging drivers area) or higher.
2014-05-06 20:04:22 +02:00