;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
+;;; Copyright © 2020 Brice Waegeneire <brice@waegenei.re>
+;;; Copyright © 2020 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2021 raid5atemyhomework <raid5atemyhomework@protonmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
#:use-module (guix records)
#:use-module (guix modules)
#:use-module (gnu services)
+ #:use-module (gnu services base)
#:use-module (gnu services shepherd)
#:use-module (gnu packages linux)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
+ #:use-module (srfi srfi-34)
+ #:use-module (srfi srfi-35)
#:use-module (ice-9 match)
#:export (earlyoom-configuration
earlyoom-configuration?
earlyoom-configuration-ignore-positive-oom-score-adj?
earlyoom-configuration-show-debug-messages?
earlyoom-configuration-send-notification-command
- earlyoom-service-type))
+ earlyoom-service-type
+
+ kernel-module-loader-service-type
+
+ zram-device-configuration
+ zram-device-configuration?
+ zram-device-configuration-size
+ zram-device-configuration-compression-algorithm
+ zram-device-configuration-memory-limit
+ zram-device-configuration-priority
+ zram-device-service-type))
\f
;;;
(list (service-extension shepherd-root-service-type
(compose list earlyoom-shepherd-service))))
(description "Run @command{earlyoom}, the Early OOM daemon.")))
+
+\f
+;;;
+;;; Kernel module loader.
+;;;
+
+(define kernel-module-loader-shepherd-service
+ (match-lambda
+ ((and (? list? kernel-modules) ((? string?) ...))
+ (shepherd-service
+ (documentation "Load kernel modules.")
+ (provision '(kernel-module-loader))
+ (requirement '())
+ (one-shot? #t)
+ (modules `((srfi srfi-1)
+ (srfi srfi-34)
+ (srfi srfi-35)
+ (rnrs io ports)
+ ,@%default-modules))
+ (start
+ #~(lambda _
+ (cond
+ ((null? '#$kernel-modules) #t)
+ ((file-exists? "/proc/sys/kernel/modprobe")
+ (let ((modprobe (call-with-input-file
+ "/proc/sys/kernel/modprobe" get-line)))
+ (guard (c ((message-condition? c)
+ (format (current-error-port) "~a~%"
+ (condition-message c))
+ #f))
+ (every (lambda (module)
+ (invoke/quiet modprobe "--" module))
+ '#$kernel-modules))))
+ (else
+ (format (current-error-port) "error: ~a~%"
+ "Kernel is missing loadable module support.")
+ #f))))))))
+
+(define kernel-module-loader-service-type
+ (service-type
+ (name 'kernel-module-loader)
+ (description "Load kernel modules.")
+ (extensions
+ (list (service-extension shepherd-root-service-type
+ (compose list kernel-module-loader-shepherd-service))))
+ (compose concatenate)
+ (extend append)
+ (default-value '())))
+
+\f
+;;;
+;;; Kernel module loader.
+;;;
+
+(define-record-type* <zram-device-configuration>
+ zram-device-configuration make-zram-device-configuration
+ zram-device-configuration?
+ (size zram-device-configuration-size
+ (default "1G")) ; string or integer
+ (compression-algorithm zram-device-configuration-compression-algorithm
+ (default 'lzo)) ; symbol
+ (memory-limit zram-device-configuration-memory-limit
+ (default 0)) ; string or integer
+ (priority zram-device-configuration-priority
+ (default -1))) ; integer
+
+(define (zram-device-configuration->udev-string config)
+ "Translate a <zram-device-configuration> into a string which can be
+placed in a udev rules file."
+ (match config
+ (($ <zram-device-configuration> size compression-algorithm memory-limit priority)
+ (string-append
+ "KERNEL==\"zram0\", "
+ "ATTR{comp_algorithm}=\"" (symbol->string compression-algorithm) "\" "
+ (if (not (or (equal? "0" size)
+ (equal? 0 size)))
+ (string-append "ATTR{disksize}=\"" (if (number? size)
+ (number->string size)
+ size)
+ "\" ")
+ "")
+ (if (not (or (equal? "0" memory-limit)
+ (equal? 0 memory-limit)))
+ (string-append "ATTR{mem_limit}=\"" (if (number? memory-limit)
+ (number->string memory-limit)
+ memory-limit)
+ "\" ")
+ "")
+ "RUN+=\"/run/current-system/profile/sbin/mkswap /dev/zram0\" "
+ "RUN+=\"/run/current-system/profile/sbin/swapon "
+ (if (not (equal? -1 priority))
+ (string-append "--priority " (number->string priority) " ")
+ "")
+ "/dev/zram0\"\n"))))
+
+(define %zram-device-config
+ `("modprobe.d/zram.conf"
+ ,(plain-file "zram.conf"
+ "options zram num_devices=1")))
+
+(define (zram-device-udev-rule config)
+ (file->udev-rule "99-zram.rules"
+ (plain-file "99-zram.rules"
+ (zram-device-configuration->udev-string config))))
+
+(define zram-device-service-type
+ (service-type
+ (name 'zram)
+ (default-value (zram-device-configuration))
+ (extensions
+ (list (service-extension kernel-module-loader-service-type
+ (const (list "zram")))
+ (service-extension etc-service-type
+ (const (list %zram-device-config)))
+ (service-extension udev-service-type
+ (compose list zram-device-udev-rule))))
+ (description "Creates a zram swap device.")))
HCoop / jackhill / guix / guix.git / blobdiff