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system: Align zram priority with swap-space spec to clarify.

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Fixes <https://issues.guix.gnu.org/54783>.

* gnu/services/linux.scm (zram-device-configuration)
[priority]: Adapt to use #f or an integer from 0 to 32767.  Add sanitizer to
warn for the change and delay the field.
(zram-device-configuration->udev-string): Adapt as above.
* doc/guix.texi (Zram Device Service): Remove double copyright line.
Change priority description to refer to the Swap Space one, and suggest not
leaving the default #f on to properly use zram.

Reported-by: Stefan Baums <baums@stefanbaums.com>
Modified-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
This commit is contained in:
Josselin Poiret 2022-05-24 19:16:30 +02:00 committed by Maxim Cournoyer
parent 8649ac5eaa
commit a99015c878
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2 changed files with 30 additions and 10 deletions
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11
doc/guix.texi
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@ -96,10 +96,9 @@ Copyright @copyright{} 2021 Domagoj Stolfa@*
Copyright @copyright{} 2021 Hui Lu@*
Copyright @copyright{} 2021 pukkamustard@*
Copyright @copyright{} 2021 Alice Brenon@*
Copyright @copyright{} 2021 Josselin Poiret@*
Copyright @copyright{} 2021, 2022 Josselin Poiret@*
Copyright @copyright{} 2021 Andrew Tropin@*
Copyright @copyright{} 2021 Sarah Morgensen@*
Copyright @copyright{} 2021 Josselin Poiret@*
Copyright @copyright{} 2022 Remco van 't Veer@*
Copyright @copyright{} 2022 Aleksandr Vityazev@*
Copyright @copyright{} 2022 Philip M@sup{c}Grath@*
@ -35202,11 +35201,11 @@ that compression will be 2:1, it is possible that uncompressable data
can be written to swap and this is a method to limit how much memory can
be used. It accepts a string and can be a number of bytes or use a
suffix, eg.: @code{"2G"}.
@item @code{priority} (default @code{-1})
@item @code{priority} (default @code{#f})
This is the priority of the swap device created from the zram device.
@code{swapon} accepts values between -1 and 32767, with higher values
indicating higher priority. Higher priority swap will generally be used
first.
@xref{Swap Space} for a description of swap priorities. You might want
to set a specific priority for the zram device, otherwise it could end
up not being used much for the reasons described there.
@end table
@end deftp

29
gnu/services/linux.scm
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@ -4,6 +4,7 @@
;;; Copyright © 2020 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2021 raid5atemyhomework <raid5atemyhomework@protonmail.com>
;;; Copyright © 2021 B. Wilson <elaexuotee@wilsonb.com>
;;; Copyright © 2022 Josselin Poiret <dev@jpoiret.xyz>
;;;
;;; This file is part of GNU Guix.
;;;
@ -21,9 +22,12 @@
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (gnu services linux)
#:use-module (guix diagnostics)
#:use-module (guix gexp)
#:use-module (guix records)
#:use-module (guix modules)
#:use-module (guix i18n)
#:use-module (guix ui)
#:use-module (gnu services)
#:use-module (gnu services base)
#:use-module (gnu services shepherd)
@ -252,7 +256,21 @@ (define-record-type* <zram-device-configuration>
(memory-limit zram-device-configuration-memory-limit
(default 0)) ; string or integer
(priority zram-device-configuration-priority
(default -1))) ; integer
(default #f) ; integer | #f
(delayed) ; to avoid printing the deprecation
; warning multiple times
(sanitize warn-zram-priority-change)))
(define-with-syntax-properties
(warn-zram-priority-change (priority properties))
(if (eqv? priority -1)
(begin
(warning (source-properties->location properties)
(G_ "using -1 for zram priority is deprecated~%"))
(display-hint (G_ "Use #f or leave as default instead (@pxref{Linux \
Services})."))
#f)
priority))
(define (zram-device-configuration->udev-string config)
"Translate a <zram-device-configuration> into a string which can be
@ -278,9 +296,12 @@ (define (zram-device-configuration->udev-string config)
"")
"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) " ")
"")
;; TODO: Revert to simply use 'priority' after removing the deprecation
;; warning and the delayed property of the field.
(let ((priority* (force priority)))
(if priority*
(format #f "--priority ~a " priority*)
""))
"/dev/zram0\"\n"))))
(define %zram-device-config