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;;; 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>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (gnu services linux)
#:use-module (guix gexp)
#: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-earlyoom
earlyoom-configuration-minimum-available-memory
earlyoom-configuration-minimum-free-swap
earlyoom-configuration-prefer-regexp
earlyoom-configuration-avoid-regexp
earlyoom-configuration-memory-report-interval
earlyoom-configuration-ignore-positive-oom-score-adj?
earlyoom-configuration-show-debug-messages?
earlyoom-configuration-send-notification-command
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))
;;;
;;; Early OOM daemon.
;;;
(define-record-type* <earlyoom-configuration>
earlyoom-configuration make-earlyoom-configuration
earlyoom-configuration?
(earlyoom earlyoom-configuration-earlyoom
(default earlyoom))
(minimum-available-memory earlyoom-configuration-minimum-available-memory
(default 10)) ; in percent
(minimum-free-swap earlyoom-configuration-minimum-free-swap
(default 10)) ; in percent
(prefer-regexp earlyoom-configuration-prefer-regexp ; <string>
(default #f))
(avoid-regexp earlyoom-configuration-avoid-regexp ; <string>
(default #f))
(memory-report-interval earlyoom-configuration-memory-report-interval
(default 0)) ; in seconds; 0 means disabled
(ignore-positive-oom-score-adj?
earlyoom-configuration-ignore-positive-oom-score-adj? (default #f))
(run-with-higher-priority? earlyoom-configuration-run-with-higher-priority?
(default #f))
(show-debug-messages? earlyoom-configuration-show-debug-messages?
(default #f))
(send-notification-command
earlyoom-configuration-send-notification-command ; <string>
(default #f)))
(define (earlyoom-configuration->command-line-args config)
"Translate a <earlyoom-configuration> object to its command line arguments
representation."
(match config
(($ <earlyoom-configuration> earlyoom minimum-available-memory
minimum-free-swap prefer-regexp avoid-regexp
memory-report-interval
ignore-positive-oom-score-adj?
run-with-higher-priority? show-debug-messages?
send-notification-command)
`(,(file-append earlyoom "/bin/earlyoom")
,@(if minimum-available-memory
(list "-m" (format #f "~s" minimum-available-memory))
'())
,@(if minimum-free-swap
(list "-s" (format #f "~s" minimum-free-swap))
'())
,@(if prefer-regexp
(list "--prefer" prefer-regexp)
'())
,@(if avoid-regexp
(list "--avoid" avoid-regexp)
'())
"-r" ,(format #f "~s" memory-report-interval)
,@(if ignore-positive-oom-score-adj?
(list "-i")
'())
,@(if run-with-higher-priority?
(list "-p")
'())
,@(if show-debug-messages?
(list "-d")
'())
,@(if send-notification-command
(list "-N" send-notification-command)
'())))))
(define (earlyoom-shepherd-service config)
(shepherd-service
(documentation "Run the Early OOM daemon.")
(provision '(earlyoom))
(start #~(make-forkexec-constructor
'#$(earlyoom-configuration->command-line-args config)
#:log-file "/var/log/earlyoom.log"))
(stop #~(make-kill-destructor))))
(define earlyoom-service-type
(service-type
(name 'earlyoom)
(default-value (earlyoom-configuration))
(extensions
(list (service-extension shepherd-root-service-type
(compose list earlyoom-shepherd-service))))
(description "Run @command{earlyoom}, the Early OOM daemon.")))
;;;
;;; Kernel module loader.
;;;
(define kernel-module-loader-shepherd-service
(match-lambda
((and (? list? kernel-modules) ((? string?) ...))
(list
(shepherd-service
(documentation "Load kernel modules.")
(provision '(kernel-module-loader))
(requirement '(file-systems))
(one-shot? #t)
(modules `((srfi srfi-1)
(srfi srfi-34)
(srfi srfi-35)
(rnrs io ports)
,@%default-modules))
(start
#~(lambda _
(cond
((null? '#$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))
'#$kernel-modules))))
(else
(format (current-error-port) "error: ~a~%"
"Kernel is missing loadable module support.")
#f)))))))))
(define kernel-module-loader-service-type
(service-type
(name 'kernel-module-loader)
(description "Load kernel modules.")
(extensions
(list (service-extension shepherd-root-service-type
kernel-module-loader-shepherd-service)))
(compose concatenate)
(extend append)
(default-value '())))
;;;
;;; Kernel module loader.
;;;
(define-record-type* <zram-device-configuration>
zram-device-configuration make-zram-device-configuration
zram-device-configuration?
(size zram-device-configuration-size
(default "1G")) ; string or integer
(compression-algorithm zram-device-configuration-compression-algorithm
(default 'lzo)) ; symbol
(memory-limit zram-device-configuration-memory-limit
(default 0)) ; string or integer
(priority zram-device-configuration-priority
(default -1))) ; integer
(define (zram-device-configuration->udev-string config)
"Translate a <zram-device-configuration> into a string which can be
placed in a udev rules file."
(match config
(($ <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.")))
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