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gnu: Add earlyoom-service-type. 

* gnu/services/linux.scm: New file.
* tests/services/linux.scm: Add test.
* Makefile.am (SCM_TESTS): Register test.
* doc/guix.texi (Linux Services): Add a new section and document the new
service and its configuration.
This commit is contained in:
Maxim Cournoyer 2020-01-06 01:36:00 -05:00
parent 76f5428bc6
commit d3e439e355
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4 changed files with 251 additions and 1 deletions
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1
Makefile.am
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@ -426,6 +426,7 @@ SCM_TESTS = \
tests/scripts-build.scm \
tests/search-paths.scm \
tests/services.scm \
tests/services/linux.scm \
tests/sets.scm \
tests/size.scm \
tests/snix.scm \

69
doc/guix.texi
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@ -48,7 +48,7 @@ Copyright @copyright{} 2017 humanitiesNerd@*
Copyright @copyright{} 2017 Christopher Allan Webber@*
Copyright @copyright{} 2017, 2018, 2019 Marius Bakke@*
Copyright @copyright{} 2017, 2019 Hartmut Goebel@*
Copyright @copyright{} 2017, 2019 Maxim Cournoyer@*
Copyright @copyright{} 2017, 2019, 2020 Maxim Cournoyer@*
Copyright @copyright{} 2017, 2018, 2019, 2020 Tobias Geerinckx-Rice@*
Copyright @copyright{} 2017 George Clemmer@*
Copyright @copyright{} 2017 Andy Wingo@*
@ -310,6 +310,7 @@ Services
* Version Control Services:: Providing remote access to Git repositories.
* Game Services:: Game servers.
* PAM Mount Service:: Service to mount volumes when logging in.
* Linux Services:: Services tied to the Linux kernel.
* Miscellaneous Services:: Other services.
Defining Services
@ -12084,6 +12085,7 @@ declaration.
* Game Services:: Game servers.
* PAM Mount Service:: Service to mount volumes when logging in.
* Guix Services:: Services relating specifically to Guix.
* Linux Services:: Services tied to the Linux kernel.
* Miscellaneous Services:: Other services.
@end menu
@ -25129,6 +25131,71 @@ list.
@end table
@end deftp
@node Linux Services
@subsubheading Linux Services
@cindex oom
@cindex out of memory killer
@cindex earlyoom
@cindex early out of memory daemon
@subsection Early OOM Service
@uref{https://github.com/rfjakob/earlyoom,Early OOM}, also known as
Earlyoom, is a minimalist out of memory (OOM) daemon that runs in user
space and provides a more responsive and configurable alternative to the
in-kernel OOM killer. It is useful to prevent the system from becoming
unresponsive when it runs out of memory.
@deffn {Scheme Variable} earlyoom-service-type
The service type for running @command{earlyoom}, the Early OOM daemon.
Its value must be a @code{earlyoom-configuration} object, described
below. The service can be instantiated in its default configuration
with:
@lisp
(service earlyoom-service-type)
@end lisp
@end deffn
@deftp {Data Type} earlyoom-configuration
This is the configuration record for the @code{earlyoom-service-type}.
@table @asis
@item @code{earlyoom} (default: @var{earlyoom})
The Earlyoom package to use.
@item @code{minimum-available-memory} (default: @code{10})
The threshold for the minimum @emph{available} memory, in percentages.
@item @code{minimum-free-swap} (default: @code{10})
The threshold for the minimum free swap memory, in percentages.
@item @code{prefer-regexp} (default: @code{#f})
A regular expression (as a string) to match the names of the processes
that should be preferably killed.
@item @code{avoid-regexp} (default: @code{#f})
A regular expression (as a string) to match the names of the processes
that should @emph{not} be killed.
@item @code{memory-report-interval} (default: @code{0})
The interval in seconds at which a memory report is printed. It is
disabled by default.
@item @code{ignore-positive-oom-score-adj?} (default: @code{#f})
A boolean indicating whether the positive adjustments set in
@file{/proc/*/oom_score_adj}.
@item @code{show-debug-messages?} (default: @code{#f})
A boolean indicating whether debug messages should be printed. The logs
are saved at @file{/var/log/earlyoom.log}.
@item @code{send-notification-command} (default: @code{#f})
This can be used to provide a custom command used for sending
notifications.
@end table
@end deftp
@node Miscellaneous Services
@subsection Miscellaneous Services

125
gnu/services/linux.scm Normal file
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@ -0,0 +1,125 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;;
;;; 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 shepherd)
#:use-module (gnu packages linux)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#: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))
;;;
;;; 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.")))

57
tests/services/linux.scm Normal file
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@ -0,0 +1,57 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;;
;;; 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 (tests services linux)
#:use-module (ice-9 match)
#:use-module (gnu packages linux)
#:use-module (gnu services linux)
#:use-module (guix gexp)
#:use-module (srfi srfi-64))
;;; Tests for the (gnu services linux) module.
(test-begin "linux-services")
;;;
;;; Early OOM daemon.
;;;
(define earlyoom-configuration->command-line-args
(@@ (gnu services linux) earlyoom-configuration->command-line-args))
(define %earlyoom-configuration-sample
(earlyoom-configuration
(minimum-available-memory 10)
(minimum-free-swap 20)
(prefer-regexp "icecat")
(avoid-regexp "guix-daemon")
(memory-report-interval 60)
(ignore-positive-oom-score-adj? #f)
(run-with-higher-priority? #t)
(show-debug-messages? #f)
(send-notification-command "python \"/some/path/notify-all-users.py\"")))
(test-equal "earlyoom-configuration->command-line-args"
(list (file-append earlyoom "/bin/earlyoom")
"-m" "10" "-s" "20" "--prefer" "icecat"
"--avoid" "guix-daemon" "-r" "60" "-p"
"-N" "python \"/some/path/notify-all-users.py\"")
(earlyoom-configuration->command-line-args %earlyoom-configuration-sample))
(test-end "linux-services")