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258 lines
9.9 KiB
Scheme
258 lines
9.9 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
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;;; Copyright © 2020 Brice Waegeneire <brice@waegenei.re>
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;;; Copyright © 2020 Efraim Flashner <efraim@flashner.co.il>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu services linux)
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#:use-module (guix gexp)
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#:use-module (guix records)
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#:use-module (guix modules)
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#:use-module (gnu services)
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#:use-module (gnu services base)
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#:use-module (gnu services shepherd)
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#:use-module (gnu packages linux)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-35)
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#:use-module (ice-9 match)
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#:export (earlyoom-configuration
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earlyoom-configuration?
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earlyoom-configuration-earlyoom
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earlyoom-configuration-minimum-available-memory
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earlyoom-configuration-minimum-free-swap
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earlyoom-configuration-prefer-regexp
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earlyoom-configuration-avoid-regexp
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earlyoom-configuration-memory-report-interval
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earlyoom-configuration-ignore-positive-oom-score-adj?
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earlyoom-configuration-show-debug-messages?
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earlyoom-configuration-send-notification-command
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earlyoom-service-type
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kernel-module-loader-service-type
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zram-device-configuration
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zram-device-configuration?
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zram-device-configuration-size
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zram-device-configuration-compression-algorithm
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zram-device-configuration-memory-limit
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zram-device-configuration-priority
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zram-device-service-type))
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;;;
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;;; Early OOM daemon.
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;;;
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(define-record-type* <earlyoom-configuration>
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earlyoom-configuration make-earlyoom-configuration
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earlyoom-configuration?
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(earlyoom earlyoom-configuration-earlyoom
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(default earlyoom))
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(minimum-available-memory earlyoom-configuration-minimum-available-memory
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(default 10)) ; in percent
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(minimum-free-swap earlyoom-configuration-minimum-free-swap
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(default 10)) ; in percent
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(prefer-regexp earlyoom-configuration-prefer-regexp ; <string>
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(default #f))
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(avoid-regexp earlyoom-configuration-avoid-regexp ; <string>
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(default #f))
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(memory-report-interval earlyoom-configuration-memory-report-interval
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(default 0)) ; in seconds; 0 means disabled
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(ignore-positive-oom-score-adj?
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earlyoom-configuration-ignore-positive-oom-score-adj? (default #f))
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(run-with-higher-priority? earlyoom-configuration-run-with-higher-priority?
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(default #f))
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(show-debug-messages? earlyoom-configuration-show-debug-messages?
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(default #f))
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(send-notification-command
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earlyoom-configuration-send-notification-command ; <string>
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(default #f)))
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(define (earlyoom-configuration->command-line-args config)
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"Translate a <earlyoom-configuration> object to its command line arguments
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representation."
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(match config
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(($ <earlyoom-configuration> earlyoom minimum-available-memory
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minimum-free-swap prefer-regexp avoid-regexp
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memory-report-interval
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ignore-positive-oom-score-adj?
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run-with-higher-priority? show-debug-messages?
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send-notification-command)
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`(,(file-append earlyoom "/bin/earlyoom")
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,@(if minimum-available-memory
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(list "-m" (format #f "~s" minimum-available-memory))
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'())
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,@(if minimum-free-swap
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(list "-s" (format #f "~s" minimum-free-swap))
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'())
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,@(if prefer-regexp
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(list "--prefer" prefer-regexp)
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'())
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,@(if avoid-regexp
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(list "--avoid" avoid-regexp)
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'())
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"-r" ,(format #f "~s" memory-report-interval)
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,@(if ignore-positive-oom-score-adj?
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(list "-i")
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'())
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,@(if run-with-higher-priority?
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(list "-p")
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'())
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,@(if show-debug-messages?
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(list "-d")
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'())
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,@(if send-notification-command
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(list "-N" send-notification-command)
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'())))))
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(define (earlyoom-shepherd-service config)
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(shepherd-service
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(documentation "Run the Early OOM daemon.")
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(provision '(earlyoom))
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(start #~(make-forkexec-constructor
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'#$(earlyoom-configuration->command-line-args config)
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#:log-file "/var/log/earlyoom.log"))
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(stop #~(make-kill-destructor))))
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(define earlyoom-service-type
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(service-type
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(name 'earlyoom)
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(default-value (earlyoom-configuration))
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(extensions
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(list (service-extension shepherd-root-service-type
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(compose list earlyoom-shepherd-service))))
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(description "Run @command{earlyoom}, the Early OOM daemon.")))
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;;;
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;;; Kernel module loader.
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;;;
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(define kernel-module-loader-shepherd-service
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(match-lambda
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((and (? list? kernel-modules) ((? string?) ...))
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(list
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(shepherd-service
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(documentation "Load kernel modules.")
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(provision '(kernel-module-loader))
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(requirement '(file-systems))
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(one-shot? #t)
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(modules `((srfi srfi-1)
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(srfi srfi-34)
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(srfi srfi-35)
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(rnrs io ports)
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,@%default-modules))
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(start
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#~(lambda _
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(cond
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((null? '#$kernel-modules) #t)
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((file-exists? "/proc/sys/kernel/modprobe")
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(let ((modprobe (call-with-input-file
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"/proc/sys/kernel/modprobe" get-line)))
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(guard (c ((message-condition? c)
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(format (current-error-port) "~a~%"
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(condition-message c))
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#f))
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(every (lambda (module)
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(invoke/quiet modprobe "--" module))
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'#$kernel-modules))))
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(else
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(format (current-error-port) "error: ~a~%"
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"Kernel is missing loadable module support.")
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#f)))))))))
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(define kernel-module-loader-service-type
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(service-type
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(name 'kernel-module-loader)
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(description "Load kernel modules.")
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(extensions
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(list (service-extension shepherd-root-service-type
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kernel-module-loader-shepherd-service)))
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(compose concatenate)
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(extend append)
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(default-value '())))
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;;;
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;;; Kernel module loader.
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;;;
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(define-record-type* <zram-device-configuration>
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zram-device-configuration make-zram-device-configuration
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zram-device-configuration?
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(size zram-device-configuration-size
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(default "1G")) ; string or integer
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(compression-algorithm zram-device-configuration-compression-algorithm
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(default 'lzo)) ; symbol
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(memory-limit zram-device-configuration-memory-limit
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(default 0)) ; string or integer
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(priority zram-device-configuration-priority
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(default -1))) ; integer
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(define (zram-device-configuration->udev-string config)
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"Translate a <zram-device-configuration> into a string which can be
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placed in a udev rules file."
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(match config
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(($ <zram-device-configuration> size compression-algorithm memory-limit priority)
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(string-append
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"KERNEL==\"zram0\", "
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"ATTR{comp_algorithm}=\"" (symbol->string compression-algorithm) "\" "
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(if (not (or (equal? "0" size)
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(equal? 0 size)))
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(string-append "ATTR{disksize}=\"" (if (number? size)
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(number->string size)
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size)
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"\" ")
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"")
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(if (not (or (equal? "0" memory-limit)
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(equal? 0 memory-limit)))
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(string-append "ATTR{mem_limit}=\"" (if (number? memory-limit)
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(number->string memory-limit)
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memory-limit)
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"\" ")
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"")
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"RUN+=\"/run/current-system/profile/sbin/mkswap /dev/zram0\" "
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"RUN+=\"/run/current-system/profile/sbin/swapon "
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(if (not (equal? -1 priority))
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(string-append "--priority " (number->string priority) " ")
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"")
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"/dev/zram0\"\n"))))
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(define %zram-device-config
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`("modprobe.d/zram.conf"
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,(plain-file "zram.conf"
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"options zram num_devices=1")))
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(define (zram-device-udev-rule config)
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(file->udev-rule "99-zram.rules"
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(plain-file "99-zram.rules"
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(zram-device-configuration->udev-string config))))
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(define zram-device-service-type
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(service-type
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(name 'zram)
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(default-value (zram-device-configuration))
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(extensions
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(list (service-extension kernel-module-loader-service-type
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(const (list "zram")))
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(service-extension etc-service-type
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(const (list %zram-device-config)))
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(service-extension udev-service-type
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(compose list zram-device-udev-rule))))
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(description "Creates a zram swap device.")))
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